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Compression ratio. How much can I shave off? 

 

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 Post subject: Compression ratio. How much can I shave off?
Posted: Sat Jul 02, 2005 6:31 pm 
Parts Gopher
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G'day Forum,

I have a 1993 5.0L H.O. (ED Falcon) completly stock, never opened ...

I believe it has 9.00 : 1 compression ratio.

How much should I shave of the standard heads to get the comp to around 10.2? I run a 98 Octane fuel all the time, it should handle it shouldnt it? Or will it ping its head off (Pardon the pun).

Piston - to - valve clearance should be ok? Even if I decide to put 1.72 rockers on it?


Thanks guys,

 

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Chasing 162mph on the Salt! 4.2L. Both race cars now sold! :-( Maybe a small-block tractor puller! or a Lotus 7 Clubman is next! or a 351-stroker powered EB ... ?

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Posted: Sat Jul 02, 2005 10:06 pm 
Getting Side Ways
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You will need to shave about 0.06" off which will probably cause intake alignment problems, so you will have to get the intake machined too. 10.2 is a bit much IMO but if running premium it may be ok. I wouldn't really bother puting that much work in and still run the E7 heads which really dont flow well in the first place. A better idea would be to get some GT40P's which flow a lot more and have smaller combustion chambers to start with raising the compression to around 9.5:1.
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Posted: Sat Jul 02, 2005 10:18 pm 
Parts Gopher
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Joined: 10th Nov 2004

Ride: No fords at the mo' :-(

Location: Sydney
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Hmm


Good point about the manifold alignment ...

Just was brewing on an idea .... perhaps starting with the GT40P's could be a little smarter ...

I was looking for some quick simple ways to drag a few more horses out of stock engine, and since I will have a ported manifold to go I figured why not pop the heads off for a quick clean up and shave ....

Hmmm .... the plot thickens ....

Thanks

 

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Chasing 162mph on the Salt! 4.2L. Both race cars now sold! :-( Maybe a small-block tractor puller! or a Lotus 7 Clubman is next! or a 351-stroker powered EB ... ?

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