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bdonally bdonally is offline
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Join Date: Dec 2001
Location: Off grid in Eastern ONtario
Posts: 169
Strange compression and leakdown results

Posted this on the general BBS but this is probably a better place.

Just finished checking compression and leakdown.
Cyl 1,2,3: comp ~115, leakdown ~40%, lots of air through oil tank
Cyl 4,5,6: comp ~155, leakdown 3-5%
The testing was done cold, and the results are repeatable. I can do a hot test, but the left bank is so bad that I cannot imagine it getting a whole bunch better hot.
I have been chasing a high temp problem, and eventually noticed a LOT of blowby from the oil tank.
Car has 140,000KM, top-notch rebuild at 75000km (mainly durabilitystuff for possible racing) and about 2o% of the mileage since the rebuild has been at DE events. During the rebuild the inlet manifold was ported, an Autothority maf and chip installed, along with a Al flywheel. Also valves, guides, bolts, etc.

Before I bite the bullet and pull it out, any ideas why the tests would be so lousy yet uniform on one bank, and pretty good on the other?
__________________
Bob D.
'84 Carrera - MAF, Wong chip, RSR flywheel, ER bushings and other bits, CTR fiberglass F/R bumpers, 7/9 Fuchs, 22/27 TB, 22/21 SB, bunch of other little stuff
'69 Lotus 7 Series 3; '74 Fiat X1/9
'14 X5 diesel
Old 09-05-2005, 01:06 PM
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