Super Jet JetSkiMann

kevbo

kevbo

Location
dfw
Two-strokes run into thermal problems with large bores. We can get by with them on a freestyle application. Couch racers had a difficult time keeping 80-82mm pistons from burning up at 7500 rpm. Remember that our big twins only work with big pumps since they cant turn as much rpm. Using modified Superjet engines is a cheap evolution that most jetskiers can accept. If we started from a clean sheet the 701 would be as relevant as the WR500 engine is.
 
W

wiikstromm

Location
Sweden
WFO Speedracer said:
Engine reliability mostly has to do with crankshaft stroke, the longer the stroke the higher the piston speed , the higher the piston speed the faster it wears out the top end , plus the crankshaft has to be rebuilt way more often than a stock stroke engine.
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Well it has alot more to do with that, but its a part of it
 
Big Kahuna

Big Kahuna

Administrator
Location
Tuscaloosa, AL
E350 said:
So is an AM power valve cylinder stock stroke engine the best of both worlds?

Reliability and a Reasonable Power Increase?

This statement from @Jetskimann is what first got my attention:

"We made the crankshaft in various strokers, at the moment we will not make them any more.
The pistons with a diameter of 95 mm are made by wossner.
We cast the cylinders, then heat-treated, machined and apply nikasil"

Is there any downside to making a stock stroke large piston engine?

And will a power valve cylinder help or hurt the reliability or power out of a large piston stock stroke engine?
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Having a PV does not effect reliability in the long run. It changes the exhaust port timing.......... They do require some maintenance (Cleaning) from time to time.
 
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