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130 Posts
So I've been using a TON of oil (2 quarts in 500 miles!) on my newly acquired '81 S2. I'm running Mobil 1 20W-50 V-Twin oil, I switched from Mobil 1 10W-30 which the PO had been running. I live in Texas, and felt the heavier oil would do better in the heat.
I did a compression test today, long rod was disconnected from the bellcrank, wire from coil to the dizzy disconnected, engine was hot ~180 degrees, I pulled each plug when I tested each cylinder, but the others were in place - here are the results:
Cylinder 1 - 92 lbs DRY - 160 lbs WET
Cylinder 2 - 90 lbs DRY - 150 lbs WET
Cylinder 3 - 90 lbs DRY - 150 lbs WET
Cylinder 4 - 92 lbs DRY - 140 lbs WET
Looks like the rings are the culprit - can I really be losing that much oil with cracked rings? The car does not smoke, it is running a bit rich (plugs electrodes are black after about 1500 miles) What's the next step in zeroing in on the problem? Any other ideas?
Many thanks, as always,
GC
I did a compression test today, long rod was disconnected from the bellcrank, wire from coil to the dizzy disconnected, engine was hot ~180 degrees, I pulled each plug when I tested each cylinder, but the others were in place - here are the results:
Cylinder 1 - 92 lbs DRY - 160 lbs WET
Cylinder 2 - 90 lbs DRY - 150 lbs WET
Cylinder 3 - 90 lbs DRY - 150 lbs WET
Cylinder 4 - 92 lbs DRY - 140 lbs WET
Looks like the rings are the culprit - can I really be losing that much oil with cracked rings? The car does not smoke, it is running a bit rich (plugs electrodes are black after about 1500 miles) What's the next step in zeroing in on the problem? Any other ideas?
Many thanks, as always,
GC