dani_r Posted March 5, 2009 Share Posted March 5, 2009 Hey guys, Did a compression test on the engine that I'm looking at today: These are the results: 1 - 165 2 - 125 3 - 170 4 - 155 5 - 165 6 - 165 We did another test on cylinder 2 with a little oil in the bore and it shot up to just over 175. The engine was tested cold as we can't run it as there's no rad or coolant, but cylinder 2 is still causing grief, but not sure what my options are now. Any thoughts and opinions appreciated as always For anyone who doesn't know the engine I'm testing the thread is here: http://www.mkivsupra.net/vbb/showthread.php?t=178295 Thanks Dan Quote Link to comment Share on other sites More sharing options...
Dnk Posted March 6, 2009 Share Posted March 6, 2009 Do a leak down test and it will show where the air pressure is escaping from. Quote Link to comment Share on other sites More sharing options...
dani_r Posted March 6, 2009 Author Share Posted March 6, 2009 (edited) What will the leak down test show? Valve problems? I've read that the engine has to be hot but I can't run the engine for more than a few seconds. I'm stuck with this thing now. Might just leave it Edited March 6, 2009 by dani_r (see edit history) Quote Link to comment Share on other sites More sharing options...
miko_supra Posted March 6, 2009 Share Posted March 6, 2009 What will the leak down test show? Valve problems? I've read that the engine has to be hot but I can't run the engine for more than a few seconds. I'm stuck with this thing now. Might just leave it With a leak down test the cylinder gets pressurized air forced into it through the spark plug hole. There is a gauge to tell you how much as a percentage is being lost in that cylinder. You then listen in different areas for the sound of air escaping to work out where the leak is. For example.. In the oil system=piston ring In the cooling system=head gasket In the intake=Intake valve(s) In the exhaust=Exhaust valve(s) Quote Link to comment Share on other sites More sharing options...
dani_r Posted March 6, 2009 Author Share Posted March 6, 2009 With a leak down test the cylinder gets pressurized air forced into it through the spark plug hole. There is a gauge to tell you how much as a percentage is being lost in that cylinder. You then listen in different areas for the sound of air escaping to work out where the leak is. For example.. In the oil system=piston ring In the cooling system=head gasket In the intake=Intake valve(s) In the exhaust=Exhaust valve(s) Nice one. I'll just have to find a leak down tester from somewhere! Any suggestions? Quote Link to comment Share on other sites More sharing options...
Wez Posted March 6, 2009 Share Posted March 6, 2009 http://www.max-boost.co.uk/max-boost/Leakdown_tester.htm Quote Link to comment Share on other sites More sharing options...
Guest nin73 Posted July 7, 2009 Share Posted July 7, 2009 (edited) What would be acceptable compression for a 120,000 mile + engine? Did a compression test came out as the following: 1=200 2=200 3=190 4=145 5=190 6=200 Anything to worry about there? Edited July 9, 2009 by nin73 (see edit history) Quote Link to comment Share on other sites More sharing options...
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