I have always done a compression test on a fully warmed up motor, I don't know about on a cold motor. I would expect it to fail on a cold motor as warm metal expands and seals better. But I'm sure others know much better than I do.--On Sun, Mar 31, 2013 at 5:50 AM, Donald Gallimore <dongallimore@xxxxxxx> wrote:
Partially ran a leak down and compression test on a my 440 yesterday. Engine was
not warm, just room temperature of about 60 degrees.(Does that matter?)
Compression on 4 cylinders (1,3,5,7) was around 180 psi (9.5-1 engine) but
rapidly fell off once I stopped turning the engine. Leak down was 85% for
cylinder 1 and about 45% on 8, 4 & 3. (Had to quit for dinner while trying to do
#6 which is tough to do due to clearances) Based on the sound, the air is
leaking past the rings, not the valves. Since 1 and 3 were tested both ways, not
thinking head gasket.
So, I think I need to rering the engine.
If I need to rering, can I hone the engine while it's in the car with the crank
in place or is there too much grit generated and I'm pushing it. Can I reuse the
rings? I suspect the problem is a result of gas washing the oil off the walls
since I've had a few heavy fuel discharges from the carb - stuck floats due to
my fault of putting the carb together incorrectly
Akron Don Gallimore
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Eric SturgisTacoma, WA1962 Chrysler Newport 2 door HT--
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