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Author
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Topic: 11:5 to 1 To much for pump gas??
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Cm4hawks
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Member # 5231
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posted
 
 
So what does everyone think 11:5 to 1 to much compression for pump gas?
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2007 Ford Expedition
2004 Dodge Ram 2500
Posts: 1818 | From: Pacheco CA | Registered: Jan 2005
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AJBlackGT
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Member # 3936
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posted
Static compression is not what determines whether or not you can use pump fuel. It is determined my dynamic compression (cranking compression) which has to do with the timing of valve events. With the correct camshaft 11.5:1 on pump gas is doable.
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90 Notch
Posts: 1896 | From: Sacramento | Registered: Dec 2003
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uncle bill
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Member # 3953
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posted
yes, its a bit to much
Posts: 415 | From: antioch | Registered: Dec 2003
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88bird
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Member # 1424
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posted
Combustion chamber design has a role in detonatin as well. 4 valve heads tend to handle more compression ratio.
Posts: 149 | From: Citrus Heights | Registered: Jun 2002
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90lxfoxbody
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Member # 6947
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posted
Camshaft choice plays a huge part...Also tuning and possibly polished chambers if you havent built the engine yet.
Its doable with the right cam and cylinder head work and a good tune.
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Owner Of All Out Performance
Ya I own that Cobra
Old setup whipple and jug 9.37 155
New twins hoping for 8.50s at 165
Posts: 588 | From: fresno ca | Registered: Jul 2006
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uncle bill
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Member # 3953
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posted
go to a reputable motor builder see what they tell you
Posts: 415 | From: antioch | Registered: Dec 2003
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AJBlackGT
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Member # 3936
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posted
quote:
Originally posted by uncle bill:
go to a reputable motor builder see what they tell you
Go do a reputable CAMSHAFT grinder and see what they tell you...
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90 Notch
Posts: 1896 | From: Sacramento | Registered: Dec 2003
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AJBlackGT
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Member # 3936
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posted
quote:
Originally posted by 90lxfoxbody:
Camshaft choice plays a huge part...Also tuning and possibly polished chambers if you havent built the engine yet.
Its doable with the right cam and cylinder head work and a good tune.
Yes, sharp egdes and burrs in the combustion chamber will cause detonation problems with any setup.
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90 Notch
Posts: 1896 | From: Sacramento | Registered: Dec 2003
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90lxfoxbody
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Member # 6947
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posted
and its even worse when tring to cheat with high comp ratio...Ive done many 12 to 1 setups on pump carbed mostly and some injected also...
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Owner Of All Out Performance
Ya I own that Cobra
Old setup whipple and jug 9.37 155
New twins hoping for 8.50s at 165
Posts: 588 | From: fresno ca | Registered: Jul 2006
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