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Author
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Topic: 9.8 : 1 VS 11.2 : 1 Compression
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StrokHer
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Member # 9244
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posted
 
 
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 ]
Posts: 54 | From: Fairfield, Ca | Registered: Jun 2009
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70mach351
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Member # 7528
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posted
switch to E85. look up rob mix e85 conversions.
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70 Mach 1 gettin a make over
2001 Ford F250 Crew Cab 7.3
Posts: 1762 | From: EDH | Registered: Mar 2007
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92stangLX
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Member # 3252
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posted
11.2:1 = race gas
9.8:1 = no boost
![[Smile]](smile.gif)
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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StrokHer
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Member # 9244
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posted
anyone else?
Posts: 54 | From: Fairfield, Ca | Registered: Jun 2009
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phildog
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Member # 1214
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posted
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.
Posts: 1554 | From: 510 | Registered: Apr 2002
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StrokHer
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Member # 9244
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posted
fuel system is
prostar 500
5 gal cell
huge lines
[ April 15, 2010, 07:16 PM: Message edited by: StrokHer ]
Posts: 54 | From: Fairfield, Ca | Registered: Jun 2009
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JohnB
Tech Moderator
Member # 969
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posted
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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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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