[NSRCA-discussion] 120 AC issues

[John Ferrell]

A couple of long shots:
Bad servo, it is really tough to fix an engine that is not broke!

Regulator gasket. Fuzzy fuel port holes lead to lean runs...

John Ferrell    W8CCW

"All that is necessary for the triumph of evil is for good men to do 
nothing." -- Edmund Burke
http://DixieNC.US

----- Original Message ----- 
From: "Stuart Chale" <schale at optonline.net>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, July 12, 2008 11:31 PM
Subject: Re: [NSRCA-discussion] 120 AC issues


> 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
>
> Gene Maurice wrote:
>> There was a Dalotel kitted by Dick Hansen back in the early / mid 80's,
>> could be his....
>>
>> I had the issue you are describing once with an AC. Ended up being a
>> slightly out of round sleeve. Everything was fine on the ground and early
>> into a flight until it got really hot. When it heats up it causes the 
>> sleeve
>> to further warp resulting is a total loss of power. When the engine was
>> disassembled I could see a discoloration on the sleeve where it was tight
>> and getting excessively hot. The cure was a new sleeve, piston, and ring.
>> (ouch $$$$$).
>>
>>
>> Gene Maurice
>> Plano, TX
>> AMA 3408 NSRCA 877
>> PACSS.sgmservice.com
>> gene.maurice at sgmservice.com
>>
>>
>> -----Original Message-----
>> From: nsrca-discussion-bounces at lists.nsrca.org
>> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Stuart 
>> Chale
>> Sent: Saturday, July 12, 2008 8:41 PM
>> To: NSRCA Mailing List
>> Subject: [NSRCA-discussion] 120 AC issues
>>
>> OK this might cause some of you to think back into your memory banks but 
>> my son is trying to fly a YS 120 AC powered Dalotel.  It was back from 
>> the old pattern days and I am not sure who made the kit (FG fuse).  The 
>> motor appears to be in good condition has good compression and starts 
>> easily.  It runs great for the first 5 minutes or so and then will not 
>> throttle up.  It has not died but loses throttle response.  It does not 
>> appear to be too lean and the tank holds pressure.  The motor is not real 
>> hot.  The cylinder is touchable after landing.  It seems to happen 
>> consistently around 5 minutes into the flight.  I figured it was a tank 
>> problem but could not find any  (changed the inside fuel line anyway). 
>> The problem does not seem to be reproducible on the ground or at least I 
>> didn't give it long enough to appear.  After landing and not refilling 
>> the tank the motor seems to run fine and the plane can be held in any 
>> attitude.  I assume that it must be something happening after part of it 
>> heats up enough but I do not remember seeing this in my 120 days.
>>
>> Thanks,
>> Stuart Chale
>>
>> _______________________________________________
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>
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