Jammy Johnny Posted June 18, 2016 Share Posted June 18, 2016 What Is the average cylinder compression results for a Impreza uk turbo 2000 with 100.000 miles ? Cold test on an engine I have is: 1...125 psi 3...115 psi 2...140 psi 4...140 psi They all seem a bit low to me and cylinder 3 looks really low, probably below 8 bar. I did a test a few weeks ago using another tester but it has now been binned because it was giving faulty reading on a few cars. Quote Link to comment Share on other sites More sharing options...
Jammy Johnny Posted June 18, 2016 Author Share Posted June 18, 2016 Took me ages to work out how to upload a video of the sound my engine is making. My kids say its because Im getting old :) But Listen to the engine tone when holding it at 2500 rpm. It does not sound proper to me Quote Link to comment Share on other sites More sharing options...
Sandals Posted June 19, 2016 Share Posted June 19, 2016 I don't know the answer off the top of my head but did some googling as I'm working night shift (hee haw else to do!) and it seems a normal pressure is somewhere in the high 130's to 140's and all the cylinders should be within in around 7 - 10psi of each other. So I would say cylinders 1 & 3 are def down on compression. So maybe the start of a head gasket on its way out? 2 Quote Link to comment Share on other sites More sharing options...
Jammy Johnny Posted June 19, 2016 Author Share Posted June 19, 2016 Thats what I did not want to hear. Mind you If the engine has to come out then under bonnet is getting a good clean up and all things painted. Cheers Sandals Quote Link to comment Share on other sites More sharing options...
Sandals Posted June 19, 2016 Share Posted June 19, 2016 Sorry to be the bearer of bad news! Fingers crossed i'm wrong... but since it's the two cylinders on the drivers side, head gasket would make sense :( 1 Quote Link to comment Share on other sites More sharing options...
Tidgy Posted June 20, 2016 Share Posted June 20, 2016 Its more about balance across the cylinders rather than how high. Doesn't look great with 1 and 3 being down, 3 looks pretty poor result 1 Quote Link to comment Share on other sites More sharing options...
Jammy Johnny Posted June 20, 2016 Author Share Posted June 20, 2016 I think its best to pull the engine and do a rebuild. I should have done this a couple of years ago but I became unwell and garaged the car. Now I am fighting fit the car is getting sorted properly, It will be a modern classic by the time I have finished it lol. I will probably do the build topic when I have the time because I have loads of photos of the old scoob with all the work I am doing, Its just not a cheap car to work on so It takes a bit of time. I already have the rear bumper off and the bar that is supposed to hold it on is rotten so I need to source out that, then a couple of small repairs to the rear sills and rear arches. Cut out and replace then wax oil. Tidgy do you hear anything wrong with the engine through exhaust ? Quote Link to comment Share on other sites More sharing options...
Sandals Posted June 20, 2016 Share Posted June 20, 2016 Good reason to build it stronger and better! 1 Quote Link to comment Share on other sites More sharing options...
Jammy Johnny Posted June 20, 2016 Author Share Posted June 20, 2016 Just dont let my mrs hear you say that Quote Link to comment Share on other sites More sharing options...
Tidgy Posted June 21, 2016 Share Posted June 21, 2016 Sound wont tell you much i'm afraid, unless its running really crap and spluttering. 1 Quote Link to comment Share on other sites More sharing options...
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