Shawn,
I'm shooting in the dark here and am sure I'll hear about it, but could your
engine mounts be "giving" enough under higher RPMs and higher thrust?
MMC
"Shawn" wrote in message
...
I have a so called dripless seal on my prop shaft on a 30ft Halvorsen
Island
Gypsy. Ford 120 hp. All good until 1800 RPM and the thing dribbles like a
tap. Under 1800 RPM dry again. Had a hell of a time finding the leak. Not
much fun down the the bilge beside a 7 litre diesel at 1800 RPM ;-)
Interestingly the seal has a small water inlet line from the exhaust into
the seal for lubrication - this is a standard feature apparently. The
whole
thing looks a bit fragile and fussy to me with only a single hose clamp
holding the rotating rubber seal to the shaft and up against the
stationery
"female" part of the seal - I think I'll put an old time stuffing box back
on. Any advice?

thanks Shawn
"Scallywag"