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Old 04-19-2004, 05:52 PM   #1
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smoke system problems

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I have an os 120 surpass in a new plane. I got the TME smoke pump and the slimline smoke muffler. Using smoke oil. Thought I did everything right very little) smoke.
Very little volume at high speeds but keeps on puffing while at idle. I think it might be drawing some fuild into the muffler through the pump because of low pressure in the muffler. It will keep on puffing endlessly while at idle without the pump on. Turning on the pump makes no difference.
I have the clamp used to restrict the flow right off and no difference.

Any suggestions?
Anybody got experience with a similar set up? [/quote]
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Old 04-19-2004, 10:37 PM   #2
Marty C
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You could try preheating the smoke fluid, try wrapping some brass tubing coiled around the hottest part of the 120 eg. top of exhaust header. A few coils wrapped around exhaust with fluid flowing through before entering the muffler should make a difference.
On two strokes you can also use the marine water cooling clamp on style head cooler.

4 strokes run cooler than most engines, so thick smoke on a four stroke will be harder to achieve. Maybe you could also try a bit of 'baby oil' in your smoke fluid. Regardless of which way you choose I think you will need to preheat the fluid. If you notice smoke on the gas engines works much better because of thier hotter exhaust temps...
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Old 04-20-2004, 06:11 AM   #3
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Hi Marty,

I had thought the slimline smoke muffler negated the need for pre-heating. Though I must admit it does sound like the fluid isn't burning off.

Bipeguy have you tried a rag behind the muffler to see how much stuff is coming out, at least on the ground?

I ran the pre-heat setup on a Saito .91 with great results except for some pressure problems. I'm moving it to a Saito 1.80 this year with a Sulivan Skywriter and was looking at a smoke muffler.

If anyone out there has experience should I stick wtih preheating around the header?
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Old 04-20-2004, 07:36 AM   #4
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Ya, the pre-heater built in to the muffler should be working as advertised. I have checked the exhaust and there is a little fluid coming out but not much. I'm gonna re-plumb everything again and see.
Think the negative pressure in the mufler is strong enough to draw smoke fluid out of the tank, through the pump and into the muffler when the pump is not on? Doesn't seem very likley to me but I can't explain why it puffs when at idle without the pump unless its residue built up in the muffler.
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Old 04-20-2004, 08:04 AM   #5
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Are you using a one way valve. I found the one that comes with the TME does lek alittle. Switched to a perry/conley valve and worked great.,
As far as smoke fluild, I found that straight lamp oil with parafin worked as well if not better then LHS smoke fluid. And no the colored fluid does not get/give colored smoke
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Old 04-21-2004, 12:46 AM   #6
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a good place to buy 1 way valves for smoke systems
is . found a great 1 for $7.69.
go to site and type the product code in the quick search
bar. product # is FOR150. hope i helped.
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