[NSRCA-discussion] 120 AC issues

Sun Jul 13 07:24:08 AKDT 2008

I have seen issues running ys engines and not using the right fuel. its
the viscosity of oil in the ys blends and the heli fuels that ys needs ?
that could explain why the motor only runs for a few minutes till it
heats up and the fuel could be affecting the regulator. maybe someone
else can give a more eloquent description on why .. sounds like a fuel
issue to me based on my somewhat limited experience...

gary 

________________________________

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Stuart
Chale
Sent: Sunday, July 13, 2008 10:15 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] 120 AC issues

Gaskets seem fine although I made sure everything was well tightened
this time around.  Unfortunately I do not have any replacement gaskets
at this point to just replace them.  The box did slide into the case
fairly easily.  I guess the 2 red O rings could be worn.

As far as Gary's suggestion on fuel.  I think I have only been running a
standard cool power 15% on it.  Would that account for 5 minutes of
normal running and then problems?

I wonder if I can use the extra Trex 600 motor and 7 cell packs I have
for the heli :)  That would solve these problems.

Stu

Jerry Stebbins wrote: 

	Stu, when the engine is running, and well warmed up, run it up
and get it at a higher RPM, and watch for any sign of bubbles in the
fuel lines.That is an indication of the extra heat Ron mentioned from a
bad bearing/tight bearing/shaft. Some AC's really suffered from that
problem. Also had a slightly bent shaft cause heat in the front end.
Might also check valve cover gasket/seal ( sand the cover flat) since
that could give similar symptoms after everything gets warmed up. I
assume you have already checked the box cover and gaskets.
	Jerry

		----- Original Message ----- 
		From: Stuart Chale <mailto:schale at optonline.net>  
		To: General pattern discussion
<mailto:nsrca-discussion at lists.nsrca.org>  
		Sent: Sunday, July 13, 2008 9:53 AM
		Subject: Re: [NSRCA-discussion] 120 AC issues

		Sure I just get upstairs after pulling the motor apart
again and swapping out the cylinder liner for one from another motor.
Looked almost new no burn marks but my son is getting frustrated with
little flying time each time at the field so I changed it just in case.
Put both motors back together reinstalled the motor in the plane.  Found
a new muffler in the box, put that on.  Only to find that I should have
changed the front bearing as well :)
		Can you be a little quicker next time Ron?  :)
		If this doesn't work next time the bearing and anything
else suggested.  Bearings feel fine though.  Engine was really almost
new.  Not even much carbon or varnish at the valves.
		Thanks,
		Stu

		ronclark51 at comcast.net wrote: 

			Stuart,
			I've had the same problem before. It was the
front bearing. The bearing heats up the front of the motor, then the
regulator, vaporizing the fuel. Better known as vapor lock.

			Ron.....................

				-------------- Original message
-------------- 
				From: Stuart Chale
<schale at optonline.net> <mailto:schale at optonline.net>  
				I wouldn't have thought about the pipe.
I should have another.
				Thanks,
				Stuart

				RUDDERCABL at aol.com wrote: 

				In a message dated 7/12/2008 11:33:24 PM
Eastern Daylight Time, schale at optonline.net writes:

				I'll have to pull it a part again and
see if I see anything with the sleeve.
				Anyone else have any thoughts?
				Thanks,
				Stu

				Sure do.

				Try a different pipe. I know a flyer who
had this same problem some years ago, not with an AC though. He tried
everything and the problem kept hounding him. Turned out that the pipe
was plugging up when it heated up and restricting the exhuast flow. 

				Robert

________________________________

				Get the scoop on last night's hottest
shows and the live music scene in your area - Check out TourTracker.com
<http://www.tourtracker.com/?NCID=aolmus00050000000112> !

________________________________

_______________________________________________
				NSRCA-discussion mailing list
				NSRCA-discussion at lists.nsrca.org

http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

________________________________

Subject: 
Re: [NSRCA-discussion] 120 AC issues
From: 
Stuart Chale <schale at optonline.net> <mailto:schale at optonline.net> 
Date: 
Sun, 13 Jul 2008 12:51:04 +0000
To: 
General pattern discussion <nsrca-discussion at lists.nsrca.org>
<mailto:nsrca-discussion at lists.nsrca.org> 
To: 
General pattern discussion <nsrca-discussion at lists.nsrca.org>
<mailto:nsrca-discussion at lists.nsrca.org> 

			_______________________________________________
			NSRCA-discussion mailing list
			NSRCA-discussion at lists.nsrca.org

http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

________________________________

			_______________________________________________
			NSRCA-discussion mailing list
			NSRCA-discussion at lists.nsrca.org

http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

________________________________

		_______________________________________________
		NSRCA-discussion mailing list
		NSRCA-discussion at lists.nsrca.org
		http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

________________________________

	_______________________________________________
	NSRCA-discussion mailing list
	NSRCA-discussion at lists.nsrca.org
	http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20080713/8d0d24d1/attachment.html>