Compresion Test Results!!!! need info....
Jan 14, 2006, 06:45 AM
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Compresion Test Results!!!! need info....
Hey guys we did a compresion test on my evo today and these were the results....
177
170
155
160
that doesnt seem like good news at all, can anyone sugest a route i go with in trying to figure out the problem, im thinking a leakdown is the first thing and then what should i do from there?? thanks so much!
177
170
155
160
that doesnt seem like good news at all, can anyone sugest a route i go with in trying to figure out the problem, im thinking a leakdown is the first thing and then what should i do from there?? thanks so much!
Jan 14, 2006, 07:04 AM
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do some google searching... here is a start (found this in 20 secs): https://www.evolutionm.net/forums/ar.../t-154364.html
....snip....
7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min): 1,128
kPa (163 psi)
Minimum limit (at engine speed of 250 r/min): 951 kPa
(138 psi)
8. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: 98 kPa (14 psi)
9. If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount of
engine oil through the spark plug hole, and repeat the
operations in steps 6 to 8.
(1) If the compression increases after oil is added, the cause
of the malfunction is a worn or damaged piston ring
and/or cylinder inner surface.
(2) If the compression does not rise after oil is added, the
cause is a burnt or defective valve seat, or pressure is
leaking from the gasket.
....snip.....
....snip....
7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min): 1,128
kPa (163 psi)
Minimum limit (at engine speed of 250 r/min): 951 kPa
(138 psi)
8. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: 98 kPa (14 psi)
9. If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount of
engine oil through the spark plug hole, and repeat the
operations in steps 6 to 8.
(1) If the compression increases after oil is added, the cause
of the malfunction is a worn or damaged piston ring
and/or cylinder inner surface.
(2) If the compression does not rise after oil is added, the
cause is a burnt or defective valve seat, or pressure is
leaking from the gasket.
....snip.....
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