Quote:
Originally Posted by Navigueur
Doing PPI: Compression test gives 140 on all except middle cylinders. One middle at 135, other at 130. (7% difference)
Did leak down test on 130 and 135 ones: 0%
Engine has 122,000km (76,000 miles) and is a 1989 3.2 in a carrera cab.
Comments?
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I'm not sure what that particular engine should be compression wise, but it sounds good to me. I'm curious about the "0" leak down number though, the escaped pressure has to go somewhere ie. past the valves or rings unless the combustion chamber is somehow a little bigger than the others.....(perhaps you have a little carbon build up in the 140 cylinders) . My engine (a 3.2 Euro) tested at 170 across the board when the PPI was done four years ago but since the N. American engine is a lower compression version, it is probably good. I'm sure others with more knowledge about this engine will chime in soon. Cheers