Max Compression ratio Cast Iron head 4 V on 98 Octane - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
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post #1 of 4 (permalink) Old 03-11-09, 05:46 PM Thread Starter
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Max Compression ratio Cast Iron head 4 V on 98 Octane

Hi all,

Need some help please. This may have been covered before , if so can someone post the link?

I am planning my next Cleveland Stroker build using Cast 4V Closed chamber heads.

I need to know what that max Static comp ratio 4V cast headed engine will run with using 98 Octane fuel.

I have been using the Keith black Dynamic Comp calculator, and it is showing 11.6 static and 8.308 Dynamic with the setup/ cam I plan to use.

It consists of the following:

3.850 Eagle Crank
6.125 H Beams,
+ 30 Forged flat tops, 3 cc top volume, 1.065 Comp height
zero piston deck
0.040 Compressed head gasket, Gasket bore is 4.155
The heads are standard 64cc chamber.

Planning to run a manual trans too.

Thanks in advance for all help

Spazz

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post #2 of 4 (permalink) Old 03-20-09, 11:22 PM Thread Starter
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Re: Max Compression ratio Cast Iron head 4 V on 98 Octane

Surely some one has an opinion or an idea?

Thanks

Spazz
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post #3 of 4 (permalink) Old 03-24-09, 03:46 PM
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Re: Max Compression ratio Cast Iron head 4 V on 98 Octane

Hi,i built a 351c with 4v heads with .030 over flat top pistons a few years ago.It had at least 11.5 to 1 or more compression but cant remember exacly.It would run pretty good without pinging too much on high octane gaz but prefered it when i added octane boost or mixed some race gaz in the tank.Hope this helps
P.S.:I'm thinkink of building a 460 and running it on E85,that way i could boost the compression very high to get more power(E85 runs over 104 octane)just a tought,this might be a option if E85 is available in your area.
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post #4 of 4 (permalink) Old 03-25-09, 12:52 AM Thread Starter
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Re: Max Compression ratio Cast Iron head 4 V on 98 Octane

Thanks for the input,

Much appreciated.

Spazz
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