This is topic 9.8 : 1 VS 11.2 : 1 Compression in forum Tech Talk at Northern California Ford Owners  .


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Posted by StrokHer (Member # 9244) on :
 
Im doing a stroker build right now and I am trying to chose What compression to run.

Car will not be driven on the street.

What Will the power difference be?
Can i run 91 octane on 11.2:1? Or Do i need an additive? or higher Octane?
What gas to run on both with a 150 shot of nitrous?
Will 9.8:1 accept any form of boost later?


Engine setup
-393w forged pistons/rods Aftermarket cast crank
-205cnc ported tw heads
-Cam
Duration @ .050" - 236/248
Valve Lift with 1.6 Rocker - .574/.595
Lobe Separation - 110°
-Port matched Victor jr manifod
-750 Dp carb
-150 shot

Horse power est. on both compressions?

Thanks

[ April 14, 2010, 07:04 PM: Message edited by: StrokHer ]
 
Posted by 70mach351 (Member # 7528) on :
 
switch to E85. look up rob mix e85 conversions.
 
Posted by 92stangLX (Member # 3252) on :
 
11.2:1 = race gas
9.8:1 = no boost

[Smile]
 
Posted by StrokHer (Member # 9244) on :
 
anyone else?
 
Posted by phildog (Member # 1214) on :
 
Extra compression is free horsepower, you just need the fuel system and octane to feed it. I would rather have a higher comp motor with just a little boost or squeeze than some low comp motor that you have to boost the hell out of it to get some numbers, at that point you need a mongo fuel system anyway.

Higher compression, run race gas, and squeeze it later if you want more, IMHO.
 
Posted by StrokHer (Member # 9244) on :
 
fuel system is
prostar 500
5 gal cell
huge lines

[ April 15, 2010, 07:16 PM: Message edited by: StrokHer ]
 
Posted by JohnB (Member # 969) on :
 
If you're not going to street drive it, why bother with pump gas? Run the 11+ to 1 compression, a bigger carb than that, and a cam with a touch more lobe sep. A nitrous setup will need race gas if you want to keep it together.

A 9.8-1 setup can run boost, you just need to know what you're doing when it comes to setting it up and tuning it.
 




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