Dave -
Generally good numbers. In fact, they're pretty darned high. You
running high comp pistons?
If I were to take a very critical eye and figure that there are problems
with *any* engine:
#1 shows about the difference I would expect to see in a healthy
cylinder between "Dry" and "Wet" readings (i.e. not much). #2, #3 & #4
look like candidates for a ring problem (based on the huge jump between
"Dry" and "Wet").
#1 and #3 (esp. #3) look to perhaps have a valve problem (based on their
significantly lower "Wet" readings than #2 and #4). Did you check the
valve lash before running the compression test? If #1 and #3 had their
intake valves "loose" (too much lash), it could explain some of the
(relatively) lower readings there.
My $0.02
Chris K.
"Vrba, Dave" wrote:
>
> Data from my recent compression check on the 1275.
> What does this tell me? Looks like #3 is low compared to the other cyl but
> still pretty good numbers.
> You engine gurus, please give your .02.
>
> Hot, all plugs out, throttle(s) wedged open
> cyl dry 5cc oil %Diff
> 1 182 187 2.6%
> 2 167 202 17.3%
> 3 140 174 19.5%
> 4 182 213 14.5%
>
> Thanks,
> Dave
> '62 Sprite MKII
> Dublin, CA
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