Anyone wanna calculate my compression ratio

Slow5.0

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#1

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I have TFS Twisted Wedge heads that are milled .035 or .040 and CC is 58cc or 59cc i don't remember which one is it ,guy who sold me don't remember eather
I runing Felpro OEM head gaskets 9333PT-1

 

slvrbullit302

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#2

• Oct 14, 2005

• #2

Slow5.0 said:

I have TFS Twisted Wedge heads that are milled .035 or .040 and CC is 58cc or 59cc i don't remember which one is it ,guy who sold me don't remember eather
I runing Felpro OEM head gaskets

Click to expand...

For every .007" to .010" shaved off, there is 1cc less of combustion chamber.

We need more info in order to caculate CR, like pistons (flat top, dished, domed, stock), deck clearance( how far the piston is above or below the surface of the block at TDC), bore and stroke, gasket bore and compressed thickness.


If you can get them things we should be able to calulate.

 

Slow5.0

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#3

• Oct 14, 2005

• #3

Guys i have stock 302 short block

 

Grn92LX

Fidanza Man!

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#4

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If your heads are milled .035-.040", your cc is smaller than 59cc. Unless you opened the chambers? I milled my TW heads .020" and they cc'd 57.6cc. Now they're 55.6cc with a total mill of appx .035".

Whats your head gasket thickness?

 

Slow5.0

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#5

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Well heads are .350 or .040 milled
Gasket is one from AutoZone and its Felpro 9333PT-1 OEM replacement

 

Grn92LX

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#6

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So you have a .047" compressed thickness gasket and around a 55cc chamber on stock pistons/deck. Should be around 9.5-9.6:1.

 

Slow5.0

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#7

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Grn92LX said:

So you have a .047" compressed thickness gasket and around a 55cc chamber on stock pistons/deck. Should be around 9.5-9.6:1.

Click to expand...

Ok thanks
Now question is whats stock compression ,9:1 ?

 

Grn92LX

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#8

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Stock is appx 9:1 and my 9.6:1 was a guess but should be close. You could gain a tick more with a fel pro 1011-2 gasket, its .039" compressed thickness.

 

Slow5.0

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#9

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Thanks man

I will post another thread abot compression for boost motor

 

Killercanary

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#10

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• #10

Mike I didn't do the calculations, but your guess seems a bit low to me. His heads are approx. 8-10cc's less than a stock head, do you really think that will only take him into the upper 9's?

 

Grn92LX

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#11

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Its a thicker head gasket (.047" as opposed to a .039") his block isn't decked and its a stock piston. Its just a guess but IMO it should be close. I have a comp calculator on my desktop but I do not know all the specs to type in.

By the way, whats the new combo you're planning? PM me if its a secret.

 

Slow5.0

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#12

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Its not secret, i will post soon with some questions (like i always do )

 

Grn92LX

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#13

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Slow5.0 said:

Its not secret, i will post soon with some questions (like i always do )

Click to expand...

I was asking Paul lol But i'm interested in your plans as well.

 

Slow5.0

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#14

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Grn92LX said:

I was asking Paul lol But i'm interested in your plans as well.

Click to expand...

Paul knows