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Piston Gas Porting
- kzz1p
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- thompsonmx100
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2006 gs 500 streetfighter
1982 gpz750 breathed on wreck
1985 gpz750
Kz 650
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- kzz1p
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Vertical gas ports are primarily used in drag race applications. Lateral gas ports are more often used in circle-track and road-race applications where carbon build up can occur. When gas ports are used, pressure is directed to build up behind the compression ring and seal it against the cylinder wall. This helps prevent ring flutter and extends the power curve upward in the RPM range. Vertical gas ports have the holes drilled from the deck of the piston into the top ring groove and behind the ring. Lateral gas ports are drilled through the bottom side of the top land and extend to the back wall of the ring groove.
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- ArthurGoVroom
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The engines I've built have all been short-run use (tractor pulling) so I can't confirm or deny about the increased wear phenomenon, but it does make sense.
1976 KZ900A4, 4-1 header, rear lowering kit, grab bar removed, still shining and painting parts as time permits
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- kzz1p
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The real advantage is that you can run a ring package with lower static tension than a stock ring. This gives you less friction and frees up horsepower. Without the gas ports the low tension rings wouldn't seal against the cylinder very well, but allowing extra combustion pressure to force the ring against the cylinder makes up for this. In effect you get a variable-tension ring. It's high tension when needed for sealing, low tension for reduced friction the rest of the time.
The engines I've built have all been short-run use (tractor pulling) so I can't confirm or deny about the increased wear phenomenon, but it does make sense.
What is the lowest compression ratio, you have seen them used with? The lowest I have seen is 10:1 ratio.
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- thompsonmx100
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2006 gs 500 streetfighter
1982 gpz750 breathed on wreck
1985 gpz750
Kz 650
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- arai59
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- keith1
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interesting I've never heard of that before. It makes sense but does sound like something you would want to use in a race bike rather than a street bike
and this all means what to the 99.8% of us who run on the street...?:laugh:
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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