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How To Create Exhaust Smoke Rings


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  #1  
Old 03-29-2009, 03:38 AM
cham cham is offline
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Default How To Create Exhaust Smoke Rings

I've seen some of the larger engines set up to make some incredible smoke rings from the exhaust pipe.
Can this be done with a smaller 1 1/2 hp H&M engine?
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Old 03-29-2009, 04:29 AM
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Ray Cardoza Ray Cardoza is offline
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Default Re: How To Create Exhaust Smoke Rings

I think it could be done but most that i have seen are throttle governed type making the smoke rings.
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Old 03-29-2009, 04:38 AM
johnny-farmall johnny-farmall is offline
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Default Re: How To Create Exhaust Smoke Rings

ive got a piece of 3inch pipe about 3 ft long on my fairbanks that makes killer smokerings, i believe its got to do with the length more than o.d.
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Old 03-29-2009, 08:01 AM
Rich Hudak Rich Hudak is offline
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Default Re: How To Create Exhaust Smoke Rings

A vertical pipe with a 90 degree end. decent size o.d. Give the engine a lttle more oil via the cylinder oiler. I had a 4" on my 10hp Z. made perfect smoke rings about 10 - 12" in diameter and would put about 15 in the air at once on a calm day. Its a thing of beauty.
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Old 03-29-2009, 08:49 AM
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Jebaroni Jebaroni is offline
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Default Re: How To Create Exhaust Smoke Rings

I have a 2hp engine that blows them. The pipe was fabricated by the previous owner. What was done is to take a 2" diameter section of exhaust pipe about 20" long and modify one end so that it can be threaded to a pipe fitting. On the other end, the last 4 inches are flared out larger to about 2 1/2" diameter. I always thought the flare out was what made the rings. As the engine runs and draws the exhaust air in/ou/in/out, the smoke is trapped inside the exhaust pipe. Having a larger diameter at the end keeps some smoke trapped along the outer walls while the exhaust blows through the center and you have a rolling effect with the air inside the last 4 inches. That's my theory on it anyways.
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Old 03-29-2009, 08:56 AM
midpw midpw is offline
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Default Re: How To Create Exhaust Smoke Rings

My 7 UA Thermoil blows nice smoke rings once it is nice and warmed up. I've never quite understood why.........

It's a simple 2 1/2 inch vertical pipe about 30" tall from the head. Sure is pretty when the sun is at the right angle.
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Old 03-29-2009, 09:37 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: How To Create Exhaust Smoke Rings

I think it's best to have a larger pipe on the exhaust to act as a collector for the smoke, when the engine fires it "punches through the smoke", rolling it up the walls of the pipe forming a ring. If you look closely at the smoke rings they area actually rolling, like taking an o ring and rolling it over a shaft. I want to try a piece of square tubing and see if I can make smoke squares.
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Old 03-29-2009, 09:49 AM
Marc P Marc P is offline
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Default Re: How To Create Exhaust Smoke Rings

We have had pretty good luck with smaller engines also, but the throttle govern are the best at it. The best we found was mixing tranny fluid with the gas like a 2 cycle mix. Great smoke rings. The bigger pipes do make larger rings but we've used about 2" dia and it was fine, a couple of feet or so long does well. Play around and find what you like. We have even used 3" stove pipe before and it is successful.
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Old 03-29-2009, 01:02 PM
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Default Re: How To Create Exhaust Smoke Rings

My 1.5 herculies can make some nice smoke rings. I just use a 1 3/4 exaust pipe.
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Old 03-30-2009, 06:54 AM
Rick I Rick I is offline
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Default Re: How To Create Exhaust Smoke Rings

Here's a video of my 2HP Taylor H&M engine blowing smoke rings:
http://www.youtube.com/watch?v=7jT4Ga3QLTE&fmt=18
I was surprised at the speed of the ring as it rises, and how well it holds together.

I used 2 feet of straight 2.5" dia exhaust pipe, a reducer that fit inside, etc. Closeup photo is at http://www.oldengine.org/members/inz...flerdetail.JPG

The Taylor requires oil mixed with the gas anyway (1/4 pint per gallon), so this comes naturally when I have this straight 'stack on.

-Rick
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Old 04-02-2009, 01:55 AM
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Default Re: How To Create Exhaust Smoke Rings

Thanks for the help. I didn't think it would be that easy
Gotta try it cause I can stop tinkering!


Quote:
Originally Posted by J.B. Castagnos View Post
I want to try a piece of square tubing and see if I can make smoke squares.
I may beat you to it (K)
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Old 04-02-2009, 02:28 AM
cham cham is offline
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Default Re: How To Create Exhaust Smoke Rings

Hey Rich,
You indicated a 90 degree bend on your exhaust pipe.
Is this 90 degree - the typical bend at the head to get the pipe pointed upward, or something different at the exhaust tip?

Cham
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Old 04-04-2009, 06:22 PM
Rich Hudak Rich Hudak is offline
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Default Re: How To Create Exhaust Smoke Rings

Actually my 10 hp z had an elbow on the bottom of the head and a second 90 that aimed the exhaust pipe up. The exhaust was 2" out of the head, after the 2 90s, I used a swedge to neck it up to 4".
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Old 04-04-2009, 08:25 PM
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Default Re: How To Create Exhaust Smoke Rings

I saw one with a drip oiler piped into exhaust pipe to let oil into hot exhaust .It worked and didn't foul sparkplug.
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