This is topic 11:5 to 1 To much for pump gas?? in forum Tech Talk at Northern California Ford Owners  .


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Posted by Cm4hawks (Member # 5231) on :
 
So what does everyone think 11:5 to 1 to much compression for pump gas?
 
Posted by AJBlackGT (Member # 3936) on :
 
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.
 
Posted by uncle bill (Member # 3953) on :
 
yes, its a bit to much
 
Posted by 88bird (Member # 1424) on :
 
Combustion chamber design has a role in detonatin as well. 4 valve heads tend to handle more compression ratio.
 
Posted by 90lxfoxbody (Member # 6947) on :
 
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.
 
Posted by uncle bill (Member # 3953) on :
 
go to a reputable motor builder see what they tell you
 
Posted by AJBlackGT (Member # 3936) on :
 
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...
 
Posted by AJBlackGT (Member # 3936) on :
 
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.
 
Posted by 90lxfoxbody (Member # 6947) on :
 
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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