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extending muffler exhaust

Old 06-07-2008, 03:56 PM
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Default extending muffler exhaust

Hi. I'd like to extend my muffler exhaust in order to prevent fuel from spraying all over my model. I purchased an exhaust deflector, but it's not long enough. I'd like to extend it 6-8 inches. Any products or other ideas available?
Old 06-07-2008, 04:08 PM
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Default RE: extending muffler exhaust

what engine, muffler, and plane? I can't figure why you need so much
Old 06-07-2008, 06:12 PM
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Default RE: extending muffler exhaust

Look around for some silicone tubing or something else similar. I've even seen people use clear plastic tubing from the hardware store. Keep in mind that it will affect the way the engine runs to some degree.
Old 06-07-2008, 06:18 PM
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Default RE: extending muffler exhaust

There is a large silicon tubing sold at LHSs. It's supposed to be "tuned pipe connector". There are a couple of different sizes. One fits the exhaust pipe of my OS mufflers and also the pipes on Slimline Pitts mufflers.

It fits tightly enough that if there is enough pipe covered, it'll stay on without help. But I needed to use a clamp on the Tiger60 muffler's pipe.

That's just a plastic tie-wrap on the Tiger pipe. The Skybolt didn't need anything to stay on, and can be pulled off and replaced and stay just fine.

If there is any loss of power, it's not obvious.
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Old 06-07-2008, 06:43 PM
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Default RE: extending muffler exhaust

I used the silicon tubing you can buy in an auto store on my gas engines. On A smaller plane it could mess up your CG though, it is A bit heavy. I have used JB Weld to make up A bead around the bottom of my mufflers to help hold the deflectors on A few times.
Old 06-07-2008, 07:25 PM
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Default RE: extending muffler exhaust


ORIGINAL: da Rock
If there is any loss of power, it's not obvious.
I've actually experienced some RPM increase using silicone extensions on a Slimline Pitts muffler & .46-AX. I've seen a few people run a long tub down to the wheel pant or rear of the fuse and you could tell performance was hurt.
Old 06-07-2008, 07:34 PM
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Default RE: extending muffler exhaust

what engine, muffler, and plane? I can't figure why you need so much
It's a Thunder Tiger .15 on a small P39 Airacobra Kit. Unfortunately, I installed the fire-wall backwards, so the engine mount was reversed. This forced me to flip the engine in order to align the engine correctly. So instead of the muffler being below the plane, it is actually pointing out of the top.

I'd like to direct the exhaust under the wing to avoid the mess.

You can see the predicament I created here: http://www.rcuniverse.com/forum/m_63...racobra/tm.htm
Old 06-07-2008, 09:50 PM
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Default RE: extending muffler exhaust

I just went out to my shop and checked mufflers. I have A slim line/bison/Jtec/Sullivan/no name muffler that you could mount backwards?? And it would be pointing out the side of your fuse without butchering your plane. If you just do some searches you will find something that would work. You may have A problem with it being A .15 engine though.
I went and checked your build thread, I really like the plane, what kit is it and will A .25 fit in there very well??
Old 06-07-2008, 09:58 PM
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Default RE: extending muffler exhaust

what kit is it and will A .25 fit in there very well??
I bought the kit at a local swap. It's a "Global Quality Kit". I think it's around 30 years old.

I tried stuffing a .25 into it, but it push the nose out too far.

The deflector may work.
Old 06-08-2008, 11:01 AM
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Default RE: extending muffler exhaust

I used a standard dubro exhaust deflector on my magnum .15xls and lost 1600 rpm, guess where that deflector is now !!
Old 06-08-2008, 11:13 AM
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Default RE: extending muffler exhaust

I used a Great Planes exhaust deflector on my Nexstar. Didn't fall off until I crashed it. I'm buying another one for my Dolphin.

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