ITA 240 Compression Ratio

crs240sx

New member
I have heard that Nissan lowered the compression ratio on 240's early in the first year of production.

Can anyone verify this?

My shop manual says 9:1, but a friend told me that they were produced with 10:1 pistons for the first few months.
 
I think it was just 9.5:1, but yeah, early motors had the higher-compression pistons. That's why the ITCS show 9.5:1 for the SOHC/ITA.
Michael
ITA #09
 
The 9.5:1 pistons you're talking about are avaiable through Nissan Motorsports and are in the catalog, and come in std and .40 over.
 
Can somebody verify whether the the 9.5:1 shown for the ITA 240 in the ITCS includes the allowed .5 over stock.

In other words, is the max compression allowed 9.5 or 10 to 1?
 
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