General Compression test 899 Cinq

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General Compression test 899 Cinq

goneleft

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Nov 2, 2007
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My car has recently been havign problems power wise. So I've done a compression test. I jsut wanted to make sure I was doing it right and what values I should be getting.

I let the engine run until warm, removed all the plugs then test each cylinder one by one with the throttle fully open.
What compression readings should I be getting and is there any "allowed" deviation between cylinders.

Cheers.
 
Last edited:
OK the values i got: (cylinder 1 being the furthest to the drivers side)

Cylinder 1 2 3 4

Dry 192psi 200psi 205psi 205psi
13bar 14bar 14bar 14bar

Wet 220psi 222psi 225psi 225psi
15bar 15.5bar 15.75bar 15.75bar

Any help much appreciated.
Cheers
 
Yeah I'm pretty sure its not the heat as it did it all of a sudden and hasnt got gradually worse. The plugs show signs of over fueling and exhaust smells abit.
Got a Lambda to put in it, just having trouble getting the old one out.
If not I've got abit of time off work soon so Ill break it right down and replace the rocker cover gasket and the one in between the two partsof the throttle body if i can ever ger ePER to work so i can get the part#.
 
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