[NSRCA-discussion] Break-in procedure for OS140
dwaynenancy
dwaynenancy at cox.net
Tue Jun 13 13:43:25 AKDT 2006
I want to reset my idle needle to the factory setting. Is there some
way to do this?
Dwayne
Wayne Galligan wrote:
> Colin,
>
> What is the length of you setup from the plug to the baffle inside?
> If I remember right the baflle is 15" from the inlet.
>
> Mine is at 26" from the plug and I finaLy was able to get a real good
> down line braking and richen the low end out. The Aeroslave pipe will
> make a ton of power in a shorter length but the engine gets peaky and
> will come on the pipe or really unload. One thing about this pipe.
> If it is burbly rich in the midrange the length is too short.
>
> Wayne Galligan
>
> ----- Original Message -----
> *From:* colin chariandy <mailto:cchariandy at yahoo.ca>
> *To:* NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
> *Sent:* Tuesday, June 13, 2006 11:40 AM
> *Subject:* Re: [NSRCA-discussion] Break-in procedure for OS140
>
> Worked like a charm!!
>
> The engine ran flawlessly on the first flight after the run-in.
> I'm using the Aeroslave pipe and 15.5x12 4 blade. I'm about 1 3/4
> out with the high end and parallel with the cylinder for the low
> end screw. All seems OK.... good/slightly rich top end, reliable
> idle, rich in the middle but accelerates with no problem, good
> downline braking. When should I start moving the low end screw and
> where will the final position be ...typically?
>
> Colin.
>
> */Mike Hester <kerlock at comcast.net>/* wrote:
>
> Correction: Bottom end needle.....1/16 of a turn, not 1/8. The
> bottom end screw is VERY sensitive.
>
> -Mike
>
> ----- Original Message -----
> *From:* Mike Hester <mailto:kerlock at comcast.net>
> *To:* NSRCA Mailing List
> <mailto:nsrca-discussion at lists.nsrca.org>
> *Sent:* Tuesday, June 06, 2006 11:42 AM
> *Subject:* Re: [NSRCA-discussion] Break-in procedure for OS140
>
> I am going to write a full "care and feeding" article for
> the OS 140 for the July K-Factor, but here's a good start.
>
> First, set your low end screw parallel to the cylinder. 12
> o'clock, straight up and down. leave it there for the
> duration of the break in.
>
> Use an APC 17x10N prop. use an OS F plug.
>
> back the high end needle out 2 full turns. if you plane
> has a chin cowl, remove it. This engine gets hot for the
> first run or 2 on the ground.
>
> Crank the engine with a very high idle. Remove the igniter
> and then advance the throttle to full power after about a
> minute. It should be spitting rich.
>
> Turn the high end needle until it gets some good RPM but
> still very rich. You should be putting out some serious
> smoke. let it run this way for about 5 minutes, no more.
>
> Shut the engine off, and let it cool for about 1/2 hour.
> the more, the better.
>
> Fill the tank, crank it again, run it to full. This time
> go in on the needle about 2 clicks and use that for the
> reference. About every 30-45 seconds, lean it until it
> goes to max RPM, and not ANY further. Let it run this way
> for about 5 seconds, and richen it back up. Cycle it this
> way for about 7 minutes. Shut down the engine, let it cool
> again.
>
> Crank the 3rd time, and run it at the same setting for
> about 2 minutes. Now lean it a couple of more clicks, and
> it should be still putting out some serious smoke, but a
> little closer to full. Step back, and let it run wide open
> for a minute, then begin throttling it back and forth
> every minute or so. Run the tank out like this.
>
> put it together and go fly it. Don't touch the needle.
> When you get to the bottom of the 1st gallon, go in with
> the needle ONE click every flight until you get max power.
> When your low end changes, set the low end (always more
> lean, but not a whole lot. When you play with that bottom
> end, a little goes a long way. Like 1/8 of a turn or so.
>
> There are a lot of diffferent ways to do it; some people
> just set it rich and fly. This way works every time
> though, and the engines last longer.
>
> have fun,
> -Mike
>
> ----- Original Message -----
> *From:* colin chariandy <mailto:cchariandy at yahoo.ca>
> *To:* NSRCA Mailing List
> <mailto:nsrca-discussion at lists.nsrca.org>
> *Sent:* Tuesday, June 06, 2006 10:55 AM
> *Subject:* [NSRCA-discussion] Break-in procedure for OS140
>
> Just got a new OS140. I have'nt broken in one for 5
> years...what's the best/current practice for break-in?
>
> Colin.
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