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Modified Engine Specifications 1960 Willys Super Hurricane L6-226 |
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Number of Cylinders |
6 |
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Firing Order |
1-5-3-6-2-4 |
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Bore |
3.391 in |
Was 3.313 |
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Stroke |
4.800 in |
Was 4.375 |
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Displacement |
261.1 in3 |
Was 226.2 |
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Block Deck Height |
11.200 in |
Same |
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Piston Deck Height |
-0.010 in |
Was 0.015 |
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Bore to Stroke Ratio |
0.71 |
Was 0.76 |
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Rod Length |
7.000 in |
Same |
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Rod to Stroke Ratio |
1.46 |
Was 1.61 |
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Piston Compression Height |
1.800 in |
Was 2.002 |
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Crankshaft |
Forged, SAE 1035, Welded stroker |
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Number of Main Bearings |
4 with modified main bearing caps |
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Fuel (Octane) |
93; gas only |
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Cylinder Head |
Kuran Engineering custom aluminum |
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Compression Ratio |
7.5:1 |
Was 7.3:1 |
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Combustion Chamber Volume |
100 cc |
Was 83 |
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RPM – Design Maximum |
5,500 |
Was 4,000 |
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Boost – Maximum |
12 psi (Twin Paxton SN60’s) |
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Design Maximum Piston Speed |
4,000 fpm |
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RPM @ Design Max Piston Speed |
5,140 |
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Intake Port Dimensions |
1.5 in x 1.1 in |
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Intake Port Area |
1.60 in2 |
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Intake Port Volume |
80 cc |
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Intake Runner Length |
≈ 6 in |
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Intake Runner Volume |
Not measured |
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Intake Plenum Dimensions |
24” L x 2,9” DIA (Interior ) |
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Intake Plenum Volume |
2,780 cc (170 in3) |
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Fuel Injector |
36 lb/hr (Accel PN150136) |
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Thermostat Rating |
180°F w/0.028 in2 bypass area (Robert Shaw PN 301) |
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Distributor |
Autolite PN: IAT 4206 1K modified to accept hall effect camshaft and crankshaft position sensors |
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Ignition Type |
Electronic |
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Ignition Coils (6 ea.) |
Coil Near Plug (Holley Part No. 556-112) 44,000 Volts |
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Spark Plugs |
NGK (Part No. R5671A-9) Gap: 0.028” |
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Fuel Pressure Regulator |
Accel PN 74567 |
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Fuel Rail Pressure |
43 psi @ 1 ATM – Referenced to manifold pressure |
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Fuel Pump |
Tanks Inc PA-4 Kit with Walbro GSL392 (255 LPH) |
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Estimated BSFC |
0.5 – 0.7 lb/hr/hp |
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Engine Control Module |
Holley Dominator (Holley Part No: 554-114) |
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Idle Air Control |
Accel PN 74779 |
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Knock Sensor |
Bosch PN KS4-R |
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Knock Controller |
J & S Electronics Safeguard Interceptor |
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