I was tinkering with Martha (my '77 Midget) this past weekend, and
encountered something really odd. When I ran a compression test for a
baseline, the results came out:
1: 153 (or thereabouts, my tester's only marked in 5lb increments)
2: 130
3: 135
4: 155
This was done with all sparkplugs out, throttle held open and piston lifted.
Now the car hasn't been running badly (slightly rough idle sometimes, but
nothing objectionable). I checked the valve lash (thinking I had
ham-fisted it the week before), and they were all .010, right where they
should be.
I ran a pseudo leakdown test by hooking up the compression tester and
cranking the engine 4-5 revs, left the tester hooked up and noted how much
the pressure dropped off from the max reading in 20 minutes. I only
checked the best and worst cylinders (#4 and #2) as it was getting late,
but they each only bled down about 3 lbs in 20 minutes.
Anybody out there have any ideas of what's going on here?
Thanks!
Chris Kotting
ckotting@iwaynet.net
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