otrodd OS 20 4-Stroke U John Vant-Haaff IF YOU PURCHASED OS 20 four-stroke fell love did Just didpresto came out 26 Surpass virtually same weight size power Cursesfoiled again budget bit tight may affordable alternative may answer prayers Change 20 26 Surpass Its lot easier might think will have buy new crankshaft 26 Surpass 0S part no 44102000 cost approximately $2550 US changeover will also cost little timeanywhere two hours evening depending skill determination photo shows crank four washerlike shims pushrod tubes turned -inch aluminum bar stock end tube under 0-ring cylinder shim turned one-inch aluminum bar stock two new pushrods made 078 music wire patience need No special tools required disassembly Procedure Disassemble clean engine sure head bolts free dirt because some deep others bolts screwed tightly use ball drivers working engines Because small area actual contact inside socket screw result high concentration force contact least following often occurs 1 The ball breaks off 2 The socket stripped 3 The driver stripped rounded 22 Model Aviation k 0S 20 four-stroke prior modification Conversion can done evenings work parts required convert OS 20 26 cylinder shim pushrods shims 26 Surpass crankshaft 20 has completely disassembled ready conversion 26 crankshaft lower right Continued page 27 modified engine ready reassemblyabout 40 minutes work authors three-year-old engine turned 10200 rpm 9 x 6 prop after conversion conversion complete engine has remounted After opening needle valve engine ran flawlessly HotroddinglVant-Haaff Continued page 22 Any cause varying degrees heartburn Allen hex key must fit socket completely go far possible will strip key and/or bolt head during removal careful three four bolt heads engine stripped held engine soft-jawed vise chiseled slot across head offend ing screws removed bladetype screwdriver Because could readily get new screws used slitting saw mill slot across head offending screws replacing head simply used hollow ground screwdriver reinstall screwsit worked perfectly Remove camshaft cover rotate crankshaft should find pockmark right side timing gear lines up plane pushrod tube timing mark prop flange seam top front block piston will now top dead center looks little murky hard see clean piece tissue Q-Tip will recognize what look reassembly careful lose ball bearings may stay inside cover remove end camshaft Remove lifters camshaft Care fully clean blow off components like lay out clean cloth paper towel made ready lubrication reassembly dont have remove bearings decide change bearings front NSK no 698Z rear 12 x 24 x 6mm research indicates no equivalent stock North America would better off buying OS parts waiting inordinate length time replacement Place prop nut shaft until flush end crank tap out brass hammer Remove front bearing rear drift Care should taken removing rear bearing can carefully tapped out drift much safer gently evenly warm crankcase propane torch Heat front end motor facing upwards after everything else removed block until bearing simply falls out cylinder sleeve slips out easily piston can removed crankpin throw once crankshaft rotated pin bottom crankcase Manufacturing accessories make pushrods gently hold end piece 078 music wire against fine grinding wheel square off dont get hot enough change its color Radius end wire very slightly Cut wire just over 1 /2 inches long square off freshly cut end until 1518 inches length Repeat second pushrod Polish pushrod ends buffing wheel Continued page 117 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Wont Fit r er Props r Economy Less Noise No Glowplugs Low Idle Ask local duller call typical 45 will turn 13-6 over 10000 get 3 minutes oz & idle well below 2000 complete citaleg cud self-addressed 75C stmped #10 envelope & SSDI credited te 1st order DAVE DiESEl DEVELINMENJ ex 141 erd CT DM60 171-1010 Tight Hinge smooth free nylon piano wire hinge modeler can construct knuckle type hinge surface quiet operation scale like appearance U 12 hinges per package$395 per package Two Sizes Small No FOR 144 Large No FOR 145 Fourmost Products Oheck local hobby dealer other great model products Fourmost Easy install i L .--IJcONTROL SURFAcE September 1993 27 control surfaces may removed finishing repair Allows considerable deflection Satisfaction Guaranteed EE EA~ HINE 5H-710 Pkg 24 5 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite GA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7& e4t 94 fCC e4# MFG CO INC.401-7 So Front St.Montezuma IA 50171 23-5154 suffcient clearance bearings engine wouldnt go found necessary clearance 005 inch per /2-inch diameter other words one-inch-diameter bearing would have needed 010-inch clearance between diameters radius same ratio holds pretty true smaller bearings crankpin HotroddinglVantHaaff Continued page 27 Make spacers end pushrod tube -inch aluminum bar stock Face center drill drill out 182 inches deep enough can cut off four 030 spacers could also use copper aluminum brass heavy-wall tubing Almost anything including second 0-ring will job long does cut 0-ring cylinder spacer made one-inch aluminum bar stock turned approximate ly 914 0D convenient bored 802 ID Cut 060 long friend way used drill press entire operation used piece 060 plate cylinder spacer requires little drilling cutting filing can done successfully just takes longer drill press can also act bearing press necessary Reassembly The 26 crank uses collar 20 shaft together slide easily crankcase Tap crank forward brass drift until bottoms out front bearing Support front end against hardwood aluminum block Slide piston cylinder rotate crank until conrod pin bottom slip conrod onto pin Rotate crank TDC top dead center slide 060 shim over cylinder liner until tight underneath flange top Now slide liner carefully over piston push way down engine its left side place ball bottom cam recess insert camshaft pockmark facing out Take care align pockmark previously indi cated line pushrod tubes Place second ball end shaft secure end cover place Replace lifters Remove 0-rings pushrod tubes Slide 030 spacers end replace 0-rings Insert pushrod tubes slip cylinder head align snug four head bolts evenly rotation Insert new pushrods reinstall rocker assembly tappets slacked off Rotate crankshaft check lifter operation TDC compression stroke set valve clearance Replace tappet cover install crankcase end plate carburetor intake tube will notice screw holds intake tube cylinder near carburetor now out alignment Dont worry functions anyway with200-inch diameter should have 002-inch clearance awful close what Col Thacker says Bill Wisniewski says up 006-inch good rattle okay Check conrods may save engine Flying season should have some test flight results next column stall engine aircraft test bed fire up Presto Changeo takes longer tell about does itwell almost initial startup open needle valve about 900 before engine would start ran flawlessly ran tank fuel through engine varying rpm throughout its entire range operation found turned 10200 rpm 9 x 6 prop three-year-old engine has heavily used After engine cooled rechecked bolts found loosened however did have reset valve clearance Note Avoid exceeding manufacturers recommended maximum rpm Bent valves conrods ruined pistons can result Unless change bearings valve job little glass beading spruce up looks unit operation will take about five 15 minutes disassemble engine 15 minutes clean about hour make parts listed above about 40 minutes reassemble whole thing Thats total two hours So allow yourself evenings time ought easily able complete task careful lose small pieces dont spend time talking telephone will have done bedtime extra power get really worth effort engine will really get up go Note spacers addition 060 pushrod length really intended generalizationnumbers average folks can deal readily available sheet stock have lathe home shop machinist follow ing figures may pertinent Since 26s stroke longer 24 mm 0945 spacer needs half 04725 will keep compression up Likewise additional length pushrods bores slightly different two engines 18mm 7087 opposed 185 mm 7283 So displacement bit less approx imately 014 cubic inches Using A6 spacer will drop compression bit will help prevent pre-ignition tendency fanatical purist yes difference wont really have 26 will have noticeably power no appreciable outward modifications aircraft will required modified 20 will now have displacement 254 compared stock 26 268 Enjoy Flying Dutchman IALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 &7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 112A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS September1993 117 uull u1v-ur INVENTORY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISA/MC ICdDS QUALITY MODEL PRODUCTS 16 Main St Phelps NY 14532 315-548-3779
Edition: Model Aviation - 1993/09
Page Numbers: 22, 27, 117
otrodd OS 20 4-Stroke U John Vant-Haaff IF YOU PURCHASED OS 20 four-stroke fell love did Just didpresto came out 26 Surpass virtually same weight size power Cursesfoiled again budget bit tight may affordable alternative may answer prayers Change 20 26 Surpass Its lot easier might think will have buy new crankshaft 26 Surpass 0S part no 44102000 cost approximately $2550 US changeover will also cost little timeanywhere two hours evening depending skill determination photo shows crank four washerlike shims pushrod tubes turned -inch aluminum bar stock end tube under 0-ring cylinder shim turned one-inch aluminum bar stock two new pushrods made 078 music wire patience need No special tools required disassembly Procedure Disassemble clean engine sure head bolts free dirt because some deep others bolts screwed tightly use ball drivers working engines Because small area actual contact inside socket screw result high concentration force contact least following often occurs 1 The ball breaks off 2 The socket stripped 3 The driver stripped rounded 22 Model Aviation k 0S 20 four-stroke prior modification Conversion can done evenings work parts required convert OS 20 26 cylinder shim pushrods shims 26 Surpass crankshaft 20 has completely disassembled ready conversion 26 crankshaft lower right Continued page 27 modified engine ready reassemblyabout 40 minutes work authors three-year-old engine turned 10200 rpm 9 x 6 prop after conversion conversion complete engine has remounted After opening needle valve engine ran flawlessly HotroddinglVant-Haaff Continued page 22 Any cause varying degrees heartburn Allen hex key must fit socket completely go far possible will strip key and/or bolt head during removal careful three four bolt heads engine stripped held engine soft-jawed vise chiseled slot across head offend ing screws removed bladetype screwdriver Because could readily get new screws used slitting saw mill slot across head offending screws replacing head simply used hollow ground screwdriver reinstall screwsit worked perfectly Remove camshaft cover rotate crankshaft should find pockmark right side timing gear lines up plane pushrod tube timing mark prop flange seam top front block piston will now top dead center looks little murky hard see clean piece tissue Q-Tip will recognize what look reassembly careful lose ball bearings may stay inside cover remove end camshaft Remove lifters camshaft Care fully clean blow off components like lay out clean cloth paper towel made ready lubrication reassembly dont have remove bearings decide change bearings front NSK no 698Z rear 12 x 24 x 6mm research indicates no equivalent stock North America would better off buying OS parts waiting inordinate length time replacement Place prop nut shaft until flush end crank tap out brass hammer Remove front bearing rear drift Care should taken removing rear bearing can carefully tapped out drift much safer gently evenly warm crankcase propane torch Heat front end motor facing upwards after everything else removed block until bearing simply falls out cylinder sleeve slips out easily piston can removed crankpin throw once crankshaft rotated pin bottom crankcase Manufacturing accessories make pushrods gently hold end piece 078 music wire against fine grinding wheel square off dont get hot enough change its color Radius end wire very slightly Cut wire just over 1 /2 inches long square off freshly cut end until 1518 inches length Repeat second pushrod Polish pushrod ends buffing wheel Continued page 117 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Wont Fit r er Props r Economy Less Noise No Glowplugs Low Idle Ask local duller call typical 45 will turn 13-6 over 10000 get 3 minutes oz & idle well below 2000 complete citaleg cud self-addressed 75C stmped #10 envelope & SSDI credited te 1st order DAVE DiESEl DEVELINMENJ ex 141 erd CT DM60 171-1010 Tight Hinge smooth free nylon piano wire hinge modeler can construct knuckle type hinge surface quiet operation scale like appearance U 12 hinges per package$395 per package Two Sizes Small No FOR 144 Large No FOR 145 Fourmost Products Oheck local hobby dealer other great model products Fourmost Easy install i L .--IJcONTROL SURFAcE September 1993 27 control surfaces may removed finishing repair Allows considerable deflection Satisfaction Guaranteed EE EA~ HINE 5H-710 Pkg 24 5 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite GA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7& e4t 94 fCC e4# MFG CO INC.401-7 So Front St.Montezuma IA 50171 23-5154 suffcient clearance bearings engine wouldnt go found necessary clearance 005 inch per /2-inch diameter other words one-inch-diameter bearing would have needed 010-inch clearance between diameters radius same ratio holds pretty true smaller bearings crankpin HotroddinglVantHaaff Continued page 27 Make spacers end pushrod tube -inch aluminum bar stock Face center drill drill out 182 inches deep enough can cut off four 030 spacers could also use copper aluminum brass heavy-wall tubing Almost anything including second 0-ring will job long does cut 0-ring cylinder spacer made one-inch aluminum bar stock turned approximate ly 914 0D convenient bored 802 ID Cut 060 long friend way used drill press entire operation used piece 060 plate cylinder spacer requires little drilling cutting filing can done successfully just takes longer drill press can also act bearing press necessary Reassembly The 26 crank uses collar 20 shaft together slide easily crankcase Tap crank forward brass drift until bottoms out front bearing Support front end against hardwood aluminum block Slide piston cylinder rotate crank until conrod pin bottom slip conrod onto pin Rotate crank TDC top dead center slide 060 shim over cylinder liner until tight underneath flange top Now slide liner carefully over piston push way down engine its left side place ball bottom cam recess insert camshaft pockmark facing out Take care align pockmark previously indi cated line pushrod tubes Place second ball end shaft secure end cover place Replace lifters Remove 0-rings pushrod tubes Slide 030 spacers end replace 0-rings Insert pushrod tubes slip cylinder head align snug four head bolts evenly rotation Insert new pushrods reinstall rocker assembly tappets slacked off Rotate crankshaft check lifter operation TDC compression stroke set valve clearance Replace tappet cover install crankcase end plate carburetor intake tube will notice screw holds intake tube cylinder near carburetor now out alignment Dont worry functions anyway with200-inch diameter should have 002-inch clearance awful close what Col Thacker says Bill Wisniewski says up 006-inch good rattle okay Check conrods may save engine Flying season should have some test flight results next column stall engine aircraft test bed fire up Presto Changeo takes longer tell about does itwell almost initial startup open needle valve about 900 before engine would start ran flawlessly ran tank fuel through engine varying rpm throughout its entire range operation found turned 10200 rpm 9 x 6 prop three-year-old engine has heavily used After engine cooled rechecked bolts found loosened however did have reset valve clearance Note Avoid exceeding manufacturers recommended maximum rpm Bent valves conrods ruined pistons can result Unless change bearings valve job little glass beading spruce up looks unit operation will take about five 15 minutes disassemble engine 15 minutes clean about hour make parts listed above about 40 minutes reassemble whole thing Thats total two hours So allow yourself evenings time ought easily able complete task careful lose small pieces dont spend time talking telephone will have done bedtime extra power get really worth effort engine will really get up go Note spacers addition 060 pushrod length really intended generalizationnumbers average folks can deal readily available sheet stock have lathe home shop machinist follow ing figures may pertinent Since 26s stroke longer 24 mm 0945 spacer needs half 04725 will keep compression up Likewise additional length pushrods bores slightly different two engines 18mm 7087 opposed 185 mm 7283 So displacement bit less approx imately 014 cubic inches Using A6 spacer will drop compression bit will help prevent pre-ignition tendency fanatical purist yes difference wont really have 26 will have noticeably power no appreciable outward modifications aircraft will required modified 20 will now have displacement 254 compared stock 26 268 Enjoy Flying Dutchman IALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 &7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 112A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS September1993 117 uull u1v-ur INVENTORY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISA/MC ICdDS QUALITY MODEL PRODUCTS 16 Main St Phelps NY 14532 315-548-3779
Edition: Model Aviation - 1993/09
Page Numbers: 22, 27, 117
otrodd OS 20 4-Stroke U John Vant-Haaff IF YOU PURCHASED OS 20 four-stroke fell love did Just didpresto came out 26 Surpass virtually same weight size power Cursesfoiled again budget bit tight may affordable alternative may answer prayers Change 20 26 Surpass Its lot easier might think will have buy new crankshaft 26 Surpass 0S part no 44102000 cost approximately $2550 US changeover will also cost little timeanywhere two hours evening depending skill determination photo shows crank four washerlike shims pushrod tubes turned -inch aluminum bar stock end tube under 0-ring cylinder shim turned one-inch aluminum bar stock two new pushrods made 078 music wire patience need No special tools required disassembly Procedure Disassemble clean engine sure head bolts free dirt because some deep others bolts screwed tightly use ball drivers working engines Because small area actual contact inside socket screw result high concentration force contact least following often occurs 1 The ball breaks off 2 The socket stripped 3 The driver stripped rounded 22 Model Aviation k 0S 20 four-stroke prior modification Conversion can done evenings work parts required convert OS 20 26 cylinder shim pushrods shims 26 Surpass crankshaft 20 has completely disassembled ready conversion 26 crankshaft lower right Continued page 27 modified engine ready reassemblyabout 40 minutes work authors three-year-old engine turned 10200 rpm 9 x 6 prop after conversion conversion complete engine has remounted After opening needle valve engine ran flawlessly HotroddinglVant-Haaff Continued page 22 Any cause varying degrees heartburn Allen hex key must fit socket completely go far possible will strip key and/or bolt head during removal careful three four bolt heads engine stripped held engine soft-jawed vise chiseled slot across head offend ing screws removed bladetype screwdriver Because could readily get new screws used slitting saw mill slot across head offending screws replacing head simply used hollow ground screwdriver reinstall screwsit worked perfectly Remove camshaft cover rotate crankshaft should find pockmark right side timing gear lines up plane pushrod tube timing mark prop flange seam top front block piston will now top dead center looks little murky hard see clean piece tissue Q-Tip will recognize what look reassembly careful lose ball bearings may stay inside cover remove end camshaft Remove lifters camshaft Care fully clean blow off components like lay out clean cloth paper towel made ready lubrication reassembly dont have remove bearings decide change bearings front NSK no 698Z rear 12 x 24 x 6mm research indicates no equivalent stock North America would better off buying OS parts waiting inordinate length time replacement Place prop nut shaft until flush end crank tap out brass hammer Remove front bearing rear drift Care should taken removing rear bearing can carefully tapped out drift much safer gently evenly warm crankcase propane torch Heat front end motor facing upwards after everything else removed block until bearing simply falls out cylinder sleeve slips out easily piston can removed crankpin throw once crankshaft rotated pin bottom crankcase Manufacturing accessories make pushrods gently hold end piece 078 music wire against fine grinding wheel square off dont get hot enough change its color Radius end wire very slightly Cut wire just over 1 /2 inches long square off freshly cut end until 1518 inches length Repeat second pushrod Polish pushrod ends buffing wheel Continued page 117 UNLEASH POWER WITHIN DIESELIZE its AWESOME Bigger Engine Wont Fit r er Props r Economy Less Noise No Glowplugs Low Idle Ask local duller call typical 45 will turn 13-6 over 10000 get 3 minutes oz & idle well below 2000 complete citaleg cud self-addressed 75C stmped #10 envelope & SSDI credited te 1st order DAVE DiESEl DEVELINMENJ ex 141 erd CT DM60 171-1010 Tight Hinge smooth free nylon piano wire hinge modeler can construct knuckle type hinge surface quiet operation scale like appearance U 12 hinges per package$395 per package Two Sizes Small No FOR 144 Large No FOR 145 Fourmost Products Oheck local hobby dealer other great model products Fourmost Easy install i L .--IJcONTROL SURFAcE September 1993 27 control surfaces may removed finishing repair Allows considerable deflection Satisfaction Guaranteed EE EA~ HINE 5H-710 Pkg 24 5 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite GA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7& e4t 94 fCC e4# MFG CO INC.401-7 So Front St.Montezuma IA 50171 23-5154 suffcient clearance bearings engine wouldnt go found necessary clearance 005 inch per /2-inch diameter other words one-inch-diameter bearing would have needed 010-inch clearance between diameters radius same ratio holds pretty true smaller bearings crankpin HotroddinglVantHaaff Continued page 27 Make spacers end pushrod tube -inch aluminum bar stock Face center drill drill out 182 inches deep enough can cut off four 030 spacers could also use copper aluminum brass heavy-wall tubing Almost anything including second 0-ring will job long does cut 0-ring cylinder spacer made one-inch aluminum bar stock turned approximate ly 914 0D convenient bored 802 ID Cut 060 long friend way used drill press entire operation used piece 060 plate cylinder spacer requires little drilling cutting filing can done successfully just takes longer drill press can also act bearing press necessary Reassembly The 26 crank uses collar 20 shaft together slide easily crankcase Tap crank forward brass drift until bottoms out front bearing Support front end against hardwood aluminum block Slide piston cylinder rotate crank until conrod pin bottom slip conrod onto pin Rotate crank TDC top dead center slide 060 shim over cylinder liner until tight underneath flange top Now slide liner carefully over piston push way down engine its left side place ball bottom cam recess insert camshaft pockmark facing out Take care align pockmark previously indi cated line pushrod tubes Place second ball end shaft secure end cover place Replace lifters Remove 0-rings pushrod tubes Slide 030 spacers end replace 0-rings Insert pushrod tubes slip cylinder head align snug four head bolts evenly rotation Insert new pushrods reinstall rocker assembly tappets slacked off Rotate crankshaft check lifter operation TDC compression stroke set valve clearance Replace tappet cover install crankcase end plate carburetor intake tube will notice screw holds intake tube cylinder near carburetor now out alignment Dont worry functions anyway with200-inch diameter should have 002-inch clearance awful close what Col Thacker says Bill Wisniewski says up 006-inch good rattle okay Check conrods may save engine Flying season should have some test flight results next column stall engine aircraft test bed fire up Presto Changeo takes longer tell about does itwell almost initial startup open needle valve about 900 before engine would start ran flawlessly ran tank fuel through engine varying rpm throughout its entire range operation found turned 10200 rpm 9 x 6 prop three-year-old engine has heavily used After engine cooled rechecked bolts found loosened however did have reset valve clearance Note Avoid exceeding manufacturers recommended maximum rpm Bent valves conrods ruined pistons can result Unless change bearings valve job little glass beading spruce up looks unit operation will take about five 15 minutes disassemble engine 15 minutes clean about hour make parts listed above about 40 minutes reassemble whole thing Thats total two hours So allow yourself evenings time ought easily able complete task careful lose small pieces dont spend time talking telephone will have done bedtime extra power get really worth effort engine will really get up go Note spacers addition 060 pushrod length really intended generalizationnumbers average folks can deal readily available sheet stock have lathe home shop machinist follow ing figures may pertinent Since 26s stroke longer 24 mm 0945 spacer needs half 04725 will keep compression up Likewise additional length pushrods bores slightly different two engines 18mm 7087 opposed 185 mm 7283 So displacement bit less approx imately 014 cubic inches Using A6 spacer will drop compression bit will help prevent pre-ignition tendency fanatical purist yes difference wont really have 26 will have noticeably power no appreciable outward modifications aircraft will required modified 20 will now have displacement 254 compared stock 26 268 Enjoy Flying Dutchman IALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 &7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 112A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS September1993 117 uull u1v-ur INVENTORY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISA/MC ICdDS QUALITY MODEL PRODUCTS 16 Main St Phelps NY 14532 315-548-3779