REFLECTOR: Severely rough-running Franklin

[Hiroo Umeno]

Not really at full power since I can't really do that without over-heating the cylinders but most of my flights have been with a fairly high power settings to facilitate the break-in process.  I try to minimize the ground ops (as much as I can avoid at a fairly busy controlled field I am based at) and fly at 3,000 to 5,000ft altitude.

I certainly will check the plugs again (3 hours since cleaned last) but the extent of "running rough" was really not something I can attribute to fouled plugs considering the very flight before, it was running fine.  It will really only fire for 1/10th of a second at a time.

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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of John Dibble
Sent: Monday, October 30, 2006 9:04 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Severely rough-running Franklin

Has your 10 hrs of flying been at full power?  Over a 2 month period I flew mine just a few hours at reduced power because I was just doing some local sight seeing and full power speed is rough at low altitudes.  Then when I took off for a 5 hour trip, It was missing a lot so I returned and checked the plugs.  All were fine except #1.  The gaps were completely fouled (no gap at all), even on the EI plug.  I was surprised at how quickly a plug can foul.
John

Hiroo Umeno wrote:
So... I gave my plane its first oil change.  It has about 10 hours now.  As expected with a newly overhauled engine, there are some very fine dark powder mixed in the oil.  No big chunks or shavings.  So far, so good. After the oil change, I tried starting the engine.  Using the primer, I tried a few times and just could not get it to run consistently.  It will fire and do an uneven "shakes and rattles" and after a few seconds, it will die back down.  One time, I got it to run for about one minute but the running was rough and really uneven and would not idle as it used to. Subsequently, it just will not go beyond a few rattles and shakes.  My wife observed a faint white smoke blow out of the exhaust stack when it "rattles" and a few times a darker smoke subsequently. What should I look into? Hiroo






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