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Old 12-06-2012, 02:19 PM
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comp ratio ?

Ok I used a cr tester and on my engine it said it had 9.1 to 9.2 that is off Fromm what everybody kept telling me just wondering what ppl think and if it is around what I said what kind of gas would I have to run thanks to any

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Old 12-06-2012, 02:27 PM
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What kind of compressin tester tells the compression ratio?

Bill
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Old 12-06-2012, 02:29 PM
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bill u took the words right out of my mouth..

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Originally Posted by WDCreech View Post
What kind of compressin tester tells the compression ratio?

Bill
i agree with u...
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Old 12-06-2012, 02:29 PM
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By cr tester what do you mean? i am not sure of a CR tester that will give you the ratio of your engine. Do you mean a web site with a calculator.
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Old 12-06-2012, 02:51 PM
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Sorry I meant compression ration calculator
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Old 12-06-2012, 03:13 PM
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i would use gasoline that does not contain ethanol
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Old 12-06-2012, 03:33 PM
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Originally Posted by smith9300 View Post
Sorry I meant compression ration calculator
If you post your numbers and parts we can figure out how to get things working.

9:1 is ok for pump gas with mild cam. Need some more detail to help any further. Tune with 92-94 octane and you should be able to run 87 whe you get it dailed in.

Do you need higher compression?
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Old 12-06-2012, 05:14 PM
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im runnin a stock 400 with vortec heads on it the head gasket crushed hight is .039 and im runnin just a comp cam xe256
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Old 12-06-2012, 05:55 PM
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Originally Posted by smith9300 View Post
im runnin a stock 400 with vortec heads on it the head gasket crushed hight is .039 and im runnin just a comp cam xe256
What cc of pistons and heads.

You can buy a .015 head gasket from felpro. It does give you a little bump in compresion.
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Old 12-06-2012, 05:58 PM
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-22 cc and 64 cc
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Old 12-06-2012, 06:22 PM
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Quote:
Originally Posted by smith9300 View Post
-22 cc and 64 cc
are they performance pistons for blower/turbos? not an na piston but 9:1 will still give you some good power but something closer to flat tops will make some better power. I would look at the thin gaskets. or replace the pistons with something more suited to your needs.

Or go with boost.
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Old 12-06-2012, 06:55 PM
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Im not lookin to really do anything else I just wanted to know if that seemed right BC ppl kept tellin me like 9.6 to 9.8
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Old 12-06-2012, 07:00 PM
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Originally Posted by smith9300 View Post
Im not lookin to really do anything else I just wanted to know if that seemed right BC ppl kept tellin me like 9.6 to 9.8
KB web site says 9.7:1 but that may not be a complete cr calculation becuase of deck hight and actual measured head and piston cc.
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Old 12-06-2012, 07:14 PM
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Yea I used one that I had to put that in and got 9.1
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Old 12-06-2012, 07:21 PM
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comp ratio

Using United Engine & Machine Co. Incorporated your Static Compression is 9.199 and your DCR is 7.128. If you ever want to bump up your compression all you have to do is use the .015 steel shim head gasket. This will give you 9.664 and 7.476.
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