YS 110

[Dean Pappas]

Hello Alfredo,
Almost all properly broken-in ringed engines will have better compression when turned clockwise, by hand, rather than in the running direction. This is because of the "piston rock" which is due to the piston skirt-to-liner clearance and connecting rod angle. The running surfaces of the piston ring wear into the walls of the liner, best during the power stroke. When you flip the engine "backwards" the connecting rod is angled the same way, and the ring seats properly. The tighter the piston skirt-to-liner fit is, the less this is apparent.
Regards,
	Dean Pappas

-----Original Message-----
From: Alfredo Betancourt [mailto:aeromodelismo1 at yahoo.com]
Sent: Monday, January 26, 2004 12:24 PM
To: discussion at nsrca.org
Subject: YS 110


I have a question, What should I expect about the
compression of a new YS 110? let me explain, before I
started the engine it did not seemed to have a lot of
compression, then after the first couple of tanks the
compression was much higher specially while turning
the engine counterclockwise, now after three more
flights the compression feels softer but turning the
engine clockwise it seems with a little more
compression, the power is very good but I just want to
know what to expect. This is my first YS.

Regards

Alfredo

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