weird compression numbers

Bumpysbro · Post by **Bumpysbro** » May 6th, 2006, 3:18 pm

well im not sure whats really wrong with my engine, we were figuring rings but theres no black smoke or anything. im thinkin either bent valves or valve seals. i test the compression about 3 weeks ago and i got : 120, 80, 90, 110. and now i get 140, 120, 116, 126 how can they change that much in 3 weeks? i didnt even do any work on the car lol. thnx
Jon

Boris · Post by **Boris** » May 6th, 2006, 5:53 pm

maybe head gasket too? If your two middle cylinders have low compression maybe your head gasket could be damaged between the two?

ariesdude · Post by **ariesdude** » May 6th, 2006, 6:19 pm

Did you do an oil leakdown test the first time - if there is some oil in the cylinder it will provide a better seal and higher compression numbers.

Bumpysbro · Post by **Bumpysbro** » May 6th, 2006, 8:13 pm

ya thats what im thinking, and plus the oil is sparkly green haha im thinkin head gasket. ya we did a leakdown test, got 180, 140, 150, 180. so that means what? rings? how could i tell if my valve seals were bad? and man the engine sounds like crap when it turned over lol. thnx everyone

Bochek · Post by **Bochek** » May 6th, 2006, 8:34 pm

if the oils green then you eather got a bad headgasket or a craked block, u better hope its the first one, not the second.

if you do have a bad headgastet get both the block and the head check for cracks and get them decked incase their warped.

Bochek

Bumpysbro · Post by **Bumpysbro** » May 7th, 2006, 3:13 pm

haha ya i hope its not a cracked head. were taking it apart tomorrow and seeing whats up...i heard from my dad that i cant put a out of state engine in my car even though its the same year and model for my car it wont pass. can anyone else vouch for this? haha if so this sux lol thnx everyone for ur help
Jon

ariesdude · Post by **ariesdude** » May 7th, 2006, 6:12 pm

You may be able to pass if you get that extra catalytic converter just below the o2 sensor - that is the only difference i know of between CA and other state engines.

Bumpysbro · Post by **Bumpysbro** » May 8th, 2006, 2:09 pm

well we did some other tests, it doesnt seem like a cracked head. were taking it apart today so wish me luck...