Shawn

try this for a answer.  get the bentley out and go to the engine section.
look up the the difference between the extremes for the ring and cylinder
tolerances.  there is a big distance there, i forget what it is exactly.
also during that brief run it you lube the rings a bit helping seal things
up.  there are explosions happening in there so the rings/piston/sleeves
heat up pretty fast, thus expanding.

jonathan

On Thu, 17 Mar 2005, Shawn Wright wrote:

> As an experiment, I did a compression test on my '88 2.1L from dead cold
> tonight; engine has not been started since November. Readings were as
> follows: 135-135-90-125. The 90 surprised me, as the engine starts and
> runs very well.
> So I then put the plugs back in, started it, and ran for about 2-3 minutes to
> warm the oil. I then re-checked the two low cylinders (right hand bank) and
> got: 130-155. Is it typical to see a wide spread between cold and warm/hot
> readings? What possible causes are there for this? Lifter bleed down?
> (they didn't make any noise at all, even after sitting for months, thanks to
> Amsoil synthetic!). The engine wasn't even hot on the 2nd reading, just
> warm.
>
> Just curious...
>
> ps: This is the engine I will be selling in a month or so, once I get my diesel
> conversion parts lined up. If you are interested, and want to drive it before I
> pull it out, please contact me for details. (near Victoria, BC.)
>
> Thanks
> Shawn Wright
> http://zuiko.sls.bc.ca/~swright
> '85 Jetta TD (retired)
> '85 Jetta D
> '88 Westy 2.1L
> '82 Diesel Westy
>
>
>