MZ 202 exhaust
- Thread starter Mosquito
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Aerofoam
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2 strokes are tricky and have to be tuned to the engine. Usually it is more difficult to collect the pipes, so they end
up with a single pipe and expansion chamber for each cylinder...
If you are building from scratch, it would be good to start by copying one you know works well....
up with a single pipe and expansion chamber for each cylinder...
If you are building from scratch, it would be good to start by copying one you know works well....
Mayfield
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Back in the day, a guy named Gordon Jennings did a lot of two stroke work. I would not be surprised if our Vance knew him. He wrote a neat book about tuning two stroke engines that might be of interest to those still running them.
About a third of the way into the book there's a heading of "the basic process." some pretty interesting discussion on two stroke exhaust design starts there.
In the early to mid-seventies, my son and I rode two stroke one lunger motorcycles. We were always looking for ways to improve performance and playing with the exhaust was one way.
Jim
About a third of the way into the book there's a heading of "the basic process." some pretty interesting discussion on two stroke exhaust design starts there.
In the early to mid-seventies, my son and I rode two stroke one lunger motorcycles. We were always looking for ways to improve performance and playing with the exhaust was one way.
Jim
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Yes, I knew Gordon Jennings and recommend the book.
At one time I was partners in Williams Manufacturing that started life as Williams Pipes and Tony Williams used Gordon’s formulas with great success building pipes for many well known racers.
It is a big job to make a two stroke pipe that goes around corners.
He would cut multiple pieces out of sheet metal with a Beverly Shear, make them round with a roll and tack them together with a Mig welder.
He would then fusion weld all the parts together.
It is careful precise work and artistry.
At one time I was partners in Williams Manufacturing that started life as Williams Pipes and Tony Williams used Gordon’s formulas with great success building pipes for many well known racers.
It is a big job to make a two stroke pipe that goes around corners.
He would cut multiple pieces out of sheet metal with a Beverly Shear, make them round with a roll and tack them together with a Mig welder.
He would then fusion weld all the parts together.
It is careful precise work and artistry.
WaspAir
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A fellow I worked with for a time long ago had spent years designing exhaust systems for large multi-row radial engines, fitting inside tight cowlings, avoiding all rhe structural bits, and assisting in cooling. Sounded impossible to me.
Mayfield
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For a self depreciating story.
We were having overheating problems with the Groen Hawk 4. The piston one with a Continental TSIO 550.
I had an idea to use oversize pipes surrounding the exhaust pipes to entrain air from the cowling.
I asked my engineers and technicians to try it. It worked. Fortunately I had made no claims of originality. It seems many, many folks have been using the concept for at least a couple of hundred years to entrain a slow moving fluid mass by injecting a faster moving fluid mass axially.
Jim
WaspAir
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Many things in aviation are awfully old. I recently discovered that Anzani made a four-row twenty cylinder radial engine in 1913.
Mayfield
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Yeah. Apparently exhaust augmenter tubes were used a lot in the 30s and 40s.
Thanks guys for all the information. I’m in the process of building a gyro and have came to this part( I’m sure I could retrofit a Rotax system that would work). These aircraft parts are so expensive, just looking around the junk pile lol.
