Miata Turbo Forum - Boost cars, acquire cats. - 96 pistons in a 95 block

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- - 96 pistons in a 95 block - any issues? (https://www.miataturbo.net/engine-performance-56/96-pistons-95-block-any-issues-26749/)

jkballardbpl

Oct 4, 2008 12:55 PM

96 pistons in a 95 block - any issues?

Any fitment issues? Is there any change in compression to be expected (increasing or decreasing CR)?

Joe Perez

Oct 4, 2008 04:11 PM

Depends.

Starting with the 3/95 start of the ODB-II implementation (VIN 14193) the pistons were changed with a slight dome to increase the compression ratio to an actual 9.0:1. The '94-3/95 pistons were factory rated at 9.0:1 but actually was around 8.8.

94 vs 96 piston
http://members.aol.com/solomiata2/94...toncompare.jpg

source: http://members.aol.com/solomiata/MX5Engine.html

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