Mud-club
Chat & Social => The Bar - General Chat => Topic started by: paul and sam on June 22, 2008, 22:34:12
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can anyone help me with some advice. i have compression tested my V8 today and have come up with the following results 1=140 2=132 3-145 4=136 5=135 6=105 7=138 8=118 this is on a low compression engine and its a k reg is this in need of rebuilding or is it about right for the age of the engine :huh: any help would be very helpfull many thanks
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i think they should be about 135
whats wrong with the engine is it playing up
or did you just fancy doing a compresion test lol
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just decided to do a compression test (the book says 150 mim but i assume that this is a new engine)
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squirt abit of oil down onto the piston and do the test again if the readings go up its new rings time ^^
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Was the engine cold or warm??
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the engine was warm at the time of the test
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its fine. if it starts ok in a morning they your ok. only a worry if one is significantly down really.
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Being that these V8s suffer from worn cams etc, I wouldn't be surprised if the valves were not opening sufficiently to allow enough air in to get a good reading, Try the oil down the hole trick as it will give you more of an idea.
Number 6 does look to be down about 22%, if oil doesn't make any difference it gonna be valve train related.
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You also did do the test with the throttle fully open, right?
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sorry if i was abit vague :)
do the test with the engine warm and the loud pedal all the way down to get as much fuel and air into the engine, once you have been round all 8 do it again but squirt abit of oil down the bores first if the readings go up its a good bet you need new rings if not its probs a valve problem :)
hope it helps Ant.
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ok i will do this over the weekend and post the results