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2-stroke!!smoke?

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Old 05-10-2003, 01:29 PM
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iflircaircraft
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Default 2-stroke!!smoke?

I'm Still building my GP Super Skybolt and mounted an OS 1.08 2 Stroke with a Bisson pitts style muffler with pressure fitting only.
Do 2 strokes make good smoke? (get hot enough?)
Would I need to run a pre-heat coil?
I'm thinking I would need a pump and adjustable valve and another nipple on the muffler (where?)
Thanks for any input.
Tom
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Old 05-10-2003, 03:50 PM
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MinnFlyer
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Default Re: 2-stroke!!smoke?

Originally posted by iflircaircraft
Do 2 strokes make good smoke? (get hot enough?)

Would I need to run a pre-heat coil?

I'm thinking I would need a pump and adjustable valve and another nipple on the muffler (where?)
Yes

Probably not

Yes, yes, yes, and it should go close to the engines exhaust port, in a narrow area of flow (as opposed to the "Can" part of the muffler)
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Old 05-10-2003, 08:14 PM
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Default 2-stroke!!smoke?

I would think 2 strokes would run hotter, produce better smoke than 4 strokes. (2's produce power every cycle, 4's every other. More cool down time in a 4 stroke.)
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Old 05-10-2003, 09:56 PM
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MinnFlyer
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Default 2-stroke!!smoke?

The problem is that 2 strokes also blow the oil out of the muffler on every stroke, so the oil doesn't get to spend much time in the heat.
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Old 05-10-2003, 10:01 PM
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WreckRman2
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Default 2-stroke!!smoke?

Actually a 4 stroker gets much hotter and will burn oil alot better than a 2 stroker. I put smoke on a GMS76 once and while it did smoke it wasn't near hot enough to smoke well. If you want it to really smoke and smoke well you might consider using a Saito 100-120 in the Skybolt.

The other concern is weight... I later removed the smoke on my Extra because it added another 5-6oz of dead weight and whatever 8oz of oil weighed. It simply wasn't worth it in the long run.
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Old 05-14-2003, 02:52 PM
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Default 2-stroke!!smoke?

I already have the 1.08, don't want to purchase another engine.
Also the cowling is cut out for the 1.08.
Maybe I'll just forego the smoke for now.
I can always add it later....putting an accessible hatch forward of the landing gear under the fuel tank looks like an optionfor the pump.
Many happy flights.
Tom
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Old 05-15-2003, 08:59 PM
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Default 2-stroke!!smoke?

The problem is that 2 strokes also blow the oil out of the muffler on every stroke, so the oil doesn't get to spend much time in the heat.
A-ah. Now that makes sense. No wonder I've seen so few 2 strokes with smoke.
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Old 05-16-2003, 01:19 PM
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Default 2-stroke!!smoke?

This IS something I plan to experiment with (If I ever get time to experiment with stuff again!)
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Old 05-16-2003, 01:59 PM
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Default 2-stroke!!smoke?

I bought a gas engine to make smoke. I have never seen a 2 stroke make good smoke, exept the sportster I had, but I strapped one of those smoke grenades to the bottom that they used to make for RC, but they don't make those any more.
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