Cylinder Compression Values - Toyota Supra Forums

08-16-2009, 02:48 PM

TONY!

12psi boost

Join Date: Sep 2005

Location: Troy, NY 12180

Posts: 353

Quote:

Originally Posted by SupraSleuth

..The average values I obtained ranged from 207 to 217 psi. I did not expect to see values this great and now I am wondering if my compression guage is not properly calibrated. Insight anyone ??

Possible factors for high readings are:
1) Faulty readings
2) Carbon build up on the pistons and/or head
3) Someone put in high compression pistons
4) The head/block was/were milled enough so that it would change the compression
5) A thinner head gasket was used than stock specs

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