They call that the "Continental cough"...My A-65 doesn't do it, my dad's
C-85 doesn't do it, but my old C-85 on my Chief did. Don't think that
is worth worrying about...

Scott
http://corbenflyer.tripod.com


Dick wrote:

Two of us tried the "armstrong method" (rotating by hand) yesterday and both
thought we got very slightly lower resistance, but on different cylinders on
opposite sides of the engine. Him #1 and me #2 &#4..

Decided to do a "differential test" with the engine cold, rather than warmed
up. Our thought being that any matter between seat and valve would
indicate a lower reading.

Observed 78/80 on three and 77/80 on the fourth. For last 5 years the
readings have been in the 76-78 over 80 psi range.

Don't know if it matters in my case, but realize now that I've never
listened for any leaks.

My helper did mention that he thought the leakdown period should be about 5
minutes instead of just holding 80 psi long enough to observe where
indicator stops...

Thanks, Dick

ps Glad to hear that 11-1200 rpm hesitation is normal.