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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › What causes an engine to lose plugs. ?
10-15-2005 07:50 PM  12 years agoPost 1
440GTX

rrVeteran

Calgary, Canada

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Do any one know, what causes an engine to lose plugs. ?
I have a TT 50 which has been GREAT for 2 years.
I intstalled a new plug ( OS 8 ) after loosing one in the air .
( Good thing I can auto )
I checked and made sure it was tight. After the second flight I had another unplanned landing. No plug in the engine.
It was tight 2 flights ago. Running fine.
The engine was warm NOT hot with some smoke throughout the flights
CP 15 % , Stock TT 50 with stock TT 50 muffler

Any Ideas
Thanks in advance
Fred..

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10-15-2005 08:28 PM  12 years agoPost 2
airdodger

rrElite Veteran

Johnston USA

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The few times I have seen this was the engine was too hot at one point. Chris

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10-16-2005 03:54 AM  12 years agoPost 3
perfesser zero

rrKey Veteran

Dublin, VA., USA

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TT .50 and 2 years...
I'd guess the rear bearing is coming apart...unless I'm reading it wrong and the plug is falling out! If so, then stripped threads maybe?

Later...

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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10-16-2005 06:44 AM  12 years agoPost 4
Harris

rrApprentice

Cyprus

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Stripped threads, maybe?

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10-16-2005 08:34 AM  12 years agoPost 5
nivlek

rrProfessor

Norfolk England

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A lean setting can cause plugs to come out .

At the end of the day , it gets dark .

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10-16-2005 02:22 PM  12 years agoPost 6
440GTX

rrVeteran

Calgary, Canada

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Thanks for all the replys.
The plug is really tight so rule out stripped threads.
No over threading.
I will run the heli richer on both high and low and check the plug after each flight.

Fred..

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10-16-2005 04:43 PM  12 years agoPost 7
orlee008

rrVeteran

Miami, FL USA

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I had this happen to one of my buddies R70. We were breaking in a new engine so we installed a new OS 8 (tight). Set it slobbering rich and let the heli sit while it broke in. Just after the second tank was nearly through we hear a loud pop and the plug shoots out (no canopy in place) 5' in front of the R70

We dont know exactly why it happened but i think that after a while with the engine running and everything heatting up the head expanded a bit and the vibrations took care of the rest. (he had a slight vibration prob at the time too) So maybe there is something that has to be balanced on your heli. clutch, fan etc...

orlee

Flying in Miami, FL (Kendall Area)

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10-16-2005 05:03 PM  12 years agoPost 8
Doug

rrElite Veteran

Port Saint Luice Florida....

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The rear bearing retainer may be beaking up.

First member of Member of Bearings Anonymous

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