Pig Posted January 11, 2006 Share Posted January 11, 2006 Used the search with no luck. After i had a turbo blow mark did a compression test for me. He said the results came back at 96% for all of them, and that this was really good. Can someone please explain what this means. cheers Link to comment Share on other sites More sharing options...
Jake Posted January 11, 2006 Share Posted January 11, 2006 "Really good" is preferable to "Really bad" HTH Link to comment Share on other sites More sharing options...
Pig Posted January 11, 2006 Author Share Posted January 11, 2006 phew, im so pleased you cleared that up for me. thanks Link to comment Share on other sites More sharing options...
Jake Posted January 11, 2006 Share Posted January 11, 2006 You're welcome Sonny. You don't get to twelve thousand posts without learning a thing or two. Link to comment Share on other sites More sharing options...
merckx Posted January 11, 2006 Share Posted January 11, 2006 An engine compression check will tell you whether pistons, rings or bore, are worn or damaged. It'll tell you if the inlet and exhaust valves are burned or failing to seat properly. It can even tell you if the cylinder head gasket has failed. 96% is near enough perfect, as you put miles on the car this figure will slowly drop. Having the same figure for all 6 cylinders means they're perfectly balanced in terms of compression which is what you want. Link to comment Share on other sites More sharing options...
Pig Posted January 11, 2006 Author Share Posted January 11, 2006 Good stuff.Great result for 100,000miles then! thanks! Link to comment Share on other sites More sharing options...
Pete Posted January 11, 2006 Share Posted January 11, 2006 Err...yes! Link to comment Share on other sites More sharing options...
Lucifer Posted January 12, 2006 Share Posted January 12, 2006 Well depends on what he meant. He could have meant 96% of the reference cylinder. Numbers would have been more help. http://www.mkivsupra.net/vbb/showthread.php?t=55174 Link to comment Share on other sites More sharing options...
JohnA Posted January 12, 2006 Share Posted January 12, 2006 "Really good" is preferable to "Really bad" HTH Really? What exactly is the meaning of a percentage in a compression test context? (answer: not much) Percentage is only used for leakdown tests. Compression tests provide a pressure figure for each cylinder, along with the test conditions (such as warm/cold engine, number of crank turns for full figure to settle) Link to comment Share on other sites More sharing options...
Pig Posted January 12, 2006 Author Share Posted January 12, 2006 Maybe he was talking about a leek down test?? Ill ask him next time i talk to him and see what he says! Link to comment Share on other sites More sharing options...
Guest Terry S Posted January 12, 2006 Share Posted January 12, 2006 he will have done a leakdown test John. Link to comment Share on other sites More sharing options...
Lucifer Posted January 12, 2006 Share Posted January 12, 2006 If so 96% is a good result for a 100k Engine. Link to comment Share on other sites More sharing options...
Pig Posted January 12, 2006 Author Share Posted January 12, 2006 Cheers terry, that explains that then! lol. (what a penis i am) What what does a leak down test mean and how good is this result? Link to comment Share on other sites More sharing options...
Lucifer Posted January 12, 2006 Share Posted January 12, 2006 http://www.geocities.com/dsmgrrrl/FAQs/leakdown.htm Link to comment Share on other sites More sharing options...
Pig Posted January 12, 2006 Author Share Posted January 12, 2006 Cheers! Link to comment Share on other sites More sharing options...
JohnA Posted January 12, 2006 Share Posted January 12, 2006 96% leakdown on all cylinders is fecken good. Not far from race-spec in fact. PS The link posted above is a bit off. This guy suggests on a 4-cyl to do 1-4 and 2-3 togethers, as they both hit TDC together. Not good for leakdown though. Link to comment Share on other sites More sharing options...
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