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HeliBenj · 11-25-2009, 06:54 AM

Hi guys,

I'm running the OS powerboost pipe on my OS .55. They say to use some high temp silicone when installing the pipe. I did that the first time, but upon taking apart the pipe from the engine, I found the RTVwas kind of strange looking and I reinstalled the pipe without anything (no gasket, no RTV).

The engien seems to be running fine, but then this is my first nitro and I may be missing something.

What are the signs or air leaks in such a case, should I be applying RTV?

Thanks for the inputs guys

JimLerch · 11-25-2009, 07:44 AM

While in a hover, you may see drops of oil descend from the muffler / engine joint.

While on the bench after a flight, plug the exhaust and crank the motor looking "bubbles" around the joint, or again oil dripping out.

Also, when properly sealed, the motor is much more quit at an idle. However this is subjective and will take time to identify.

Personally, I'm an epoxy guy, but silicone works well also.

HeliBenj · 11-25-2009, 07:58 AM

Great tips, I'll look for those signs.

Should I crank the engine with the starter while muffler plugged? I guess by hand it wouls be near impossible. Will it do any harm to the engine?

Thanks

JimLerch · 11-25-2009, 08:22 AM

As long as the motor has been run in the past so its properly lubed, it will be fine.

Another test method is to put the piston at top dead center, and blow low pressure air into the exhuast pipe via the deflector or the fuel tank pressurization hose..

I don't know how others feel, but I feel that a properly sealed motor runs smoother and is easier to tune.

TheBum · 11-25-2009, 09:45 AM

For me, it usually is evident by a hanging drop of oil at the joint, but also as oil on the underside of the pipe or engine.

John Cook · 11-25-2009, 08:20 PM

look for burnt oil around the joint.

Most mufflers will seal fine WITHOUT any sealer. Besides ATV can flake off and get into the combustion chamber and pull out you plug element.

HeliBenj · 11-26-2009, 07:26 AM

I flew 3 tanks today without any sealant.

No oil leak residue around the joint whatsoever, I guess I'm good!

Man I love this bird!

Thanks all for your inputs

11-25-2009, 06:54 AM	#1 (permalink)
HeliBenj Registered Users Join Date: Jan 2009	Signs or Air leaks between engine and pipe? Hi guys, I'm running the OS powerboost pipe on my OS .55. They say to use some high temp silicone when installing the pipe. I did that the first time, but upon taking apart the pipe from the engine, I found the RTVwas kind of strange looking and I reinstalled the pipe without anything (no gasket, no RTV). The engien seems to be running fine, but then this is my first nitro and I may be missing something. What are the signs or air leaks in such a case, should I be applying RTV? Thanks for the inputs guys __________________ Ben Goblin 500 IKON w/ gov, Quantum 4115-1200, Hitec 5245, BLS251 DX8, RF6

11-25-2009, 07:44 AM	#2 (permalink)
JimLerch Registered Users My HF Map location Join Date: Nov 2007	While in a hover, you may see drops of oil descend from the muffler / engine joint. While on the bench after a flight, plug the exhaust and crank the motor looking "bubbles" around the joint, or again oil dripping out. Also, when properly sealed, the motor is much more quit at an idle. However this is subjective and will take time to identify. Personally, I'm an epoxy guy, but silicone works well also. __________________ James Lerch - Raptor 90, JR Vibe 500E, Gaui 550E, Xcell Razor* (*=On Loan) http://lerch.no-ip.com/atm (My homebuilt telescope site) http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project) http://www.youtube.com/profile?user=JlerchTampa (my you-tube crash videos) http://lerch.no-ip.com/Hat_Cam ("Hat Cam" for recording flights)

11-25-2009, 07:58 AM	#3 (permalink)
HeliBenj Registered Users Thread Starter Join Date: Jan 2009	Great tips, I'll look for those signs. Should I crank the engine with the starter while muffler plugged? I guess by hand it wouls be near impossible. Will it do any harm to the engine? Thanks __________________ Ben Goblin 500 IKON w/ gov, Quantum 4115-1200, Hitec 5245, BLS251 DX8, RF6

11-25-2009, 08:22 AM	#4 (permalink)
JimLerch Registered Users My HF Map location Join Date: Nov 2007	As long as the motor has been run in the past so its properly lubed, it will be fine. Another test method is to put the piston at top dead center, and blow low pressure air into the exhuast pipe via the deflector or the fuel tank pressurization hose.. I don't know how others feel, but I feel that a properly sealed motor runs smoother and is easier to tune. __________________ James Lerch - Raptor 90, JR Vibe 500E, Gaui 550E, Xcell Razor* (*=On Loan) http://lerch.no-ip.com/atm (My homebuilt telescope site) http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project) http://www.youtube.com/profile?user=JlerchTampa (my you-tube crash videos) http://lerch.no-ip.com/Hat_Cam ("Hat Cam" for recording flights)

11-25-2009, 09:45 AM	#5 (permalink)
TheBum HF Support My HF Map location Join Date: Jul 2007	For me, it usually is evident by a hanging drop of oil at the joint, but also as oil on the underside of the pipe or engine. __________________ Alan (just call me "Bum"; no need to be so formal) HeliFreak Support Protos Max Evo 700 (Brain 2), Protos Max V2 770 (iKON 2), Synergy 516 (Brain 2), Oxy 2 (Falcon 12) Graupner MZ-32 Experience is something you gain only after you need it. I wouldn't mind social media so much if it didn't involve people.

11-25-2009, 08:20 PM	#6 (permalink)
John Cook Registered Users Join Date: Jan 2008	look for burnt oil around the joint. Most mufflers will seal fine WITHOUT any sealer. Besides ATV can flake off and get into the combustion chamber and pull out you plug element. __________________ ):> KBDD MKS Servos Scorpion Power Systems/Batteries Spartan RC

11-26-2009, 07:26 AM	#7 (permalink)
HeliBenj Registered Users Thread Starter Join Date: Jan 2009	I flew 3 tanks today without any sealant. No oil leak residue around the joint whatsoever, I guess I'm good! Man I love this bird! Thanks all for your inputs __________________ Ben Goblin 500 IKON w/ gov, Quantum 4115-1200, Hitec 5245, BLS251 DX8, RF6

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