TT GP 42 Engine Leaking and compression decline  
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> Q-500 Racing >> TT GP 42 Engine Leaking and compression decline Page: [1]

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TT GP 42 Engine Leaking and compression decline - 9/1/2008 6:44:55 PM   
cmoreno.rj


 

Posts: 4
Joined: 9/14/2007
From: Rio de JaneiroRJ, BRAZIL
Status: offline 		Hi everyone,

I was flying my Viper 500 with TT 42 (bearing free according to our regulations) this weekend and after some laps, it became very slow. After I check, I could see that there was some fuel leaking from the above of the engine head. I have dismounted , saw that inside the oil was black like burned oil. After I tight the screws again I opened up a little the high speed needle but it keeps leaking and losing compression after 6 laps....

Does anyone can help on that subject ? What do you recommend? Of course the easiest answer is : Buy another one !!! but I have hope that anyone can help me out !

Thanks and rgds !



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RE: TT GP 42 Engine Leaking and compression decline - 9/2/2008 1:29:54 AM   
Duane-RCU



Posts: 440
Joined: 5/5/2002
From: Arlington, TX, USA
Status: offline 		We also used these engines on our club planes. They do not like to run hot, they lose compression very fast. Do the crock pot (anti-freeze) cleaning method to get rid of any gunk that has baked on. After that, do not spend alot of time leaning it out on the ground, it will get hot fast again. If it is still fresh, it may take some time to break-in properly before it will handle max rpm. With a 10x6 MA prop, most get around 13,000 on the ground some up around 13,300 (stock muffler) If you use a 9" prop, you might get more. But this is a sport set up, and won't do big numbers. OS 8 plug works good too, 10-15% nitro max.

(in reply to cmoreno.rj)
       Post #: 2

RE: TT GP 42 Engine Leaking and compression decline - 9/2/2008 4:53:33 AM   
skull1971



Posts: 801
Joined: 4/24/2006
From: Willis, TX, USA
Status: online 		the black burn on the piston means its running to lean, open the needle

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i,
2009 Tri-County Barnstormer V.P., and Black Sheep Squadron #1

(in reply to Duane-RCU)
       Post #: 3

RE: TT GP 42 Engine Leaking and compression decline - 9/2/2008 6:03:55 AM   
freeair


 

Posts: 409
Joined: 5/10/2008
From: queensland, AUSTRALIA
Status: online 		try a new head shim plus torque the head down evenly and tight.

(in reply to skull1971)
       Post #: 4

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