We're working on a Fiero 4-cylinder engine that hasn't been run in some time. We did a compression check and the readings are somewhat disappointing.
We had all the plugs out when we cranked the engine to circulate the new oil and pump up the lifters. The first tests gave us 90-92 lbs per cylinder (cold)
We then shot some oil into the cylinders, cranked the engine to distribute the oil and repeated the compression test. We got 125-130lbs per cylinder (cold).
It's good that the readings are even, but this is supposedly has a 12.8 CR. We haven't removed the oil pan or head yet.
By comparison, my 3.4 V6 will give a reading of 185 lbs per cylinder when cold. It has a 9.2 - 9.5 compression ratio.
Opinions? Is this potentially a boat anchor?
3.4L S/C 87 GT www.fierosound.com
2002/2003/2004 World of Wheels Winner &
Multiple IASCA Stereo Award Winner
[This message has been edited by fierosound (edited 09-03-2006).]