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JohnJL JohnJL is offline
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Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,728
Fuel injector sizing

I'd appreciate a check on my calcs before placing an order...

I am assembling my first go at a turbocharged engine and have done the calcs to estimate a need for 50-55 lb/hr injectors based on fuel pressure of 45psi and a target flywheel HP of 475 hp/475 ft-lbs.

Thats seems intuitively corrrect also since the last EFI 911 engine I built gave ~240 hp on 26lb injectors and managable idle and duty cycles.

This engine is going in my race car so need to keep in mind duty cycles will be high.

Displacement is 3.2 on new perfectbore cylinders and coated 8:1 JE pistons. SC or DR20 cams.

Thanks all
2007 911 Turbo - Not a toy
1985 911 Cab - Wife's toy
1982 911 3.2 Indiash Rot Track Supercharged track toy
1978 911 3.0 Lichtbau toy "Gretchen"
1971 911 Targa S backroad toy
Old 11-02-2007, 03:31 PM
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