I think you are on to something.DanMan1 said:How about trading in the cost, weight, bulk, and complexity of a turbo saw engine for simply more CC's?? I know, I know... that's no fun.
DanMan1 said:How about trading in the cost, weight, bulk, and complexity of a turbo saw engine for simply more CC's?? I know, I know... that's no fun.
The Krauts beat you to the punch, AL. They had a aircraft engine of simualr design in the 30's.You could do it with a direct injector. Long intake port with a tough reed on the intake. Stuff air with the blower after the piston clears the exhaust on the up stroke,inject before top dead center,hope for the best.It's all theory,who knows.I haven't quite figured out how to oil the lower end. You would have to have a real high volume blower with a fast acting waste gate.Any thing is possible,however it may not be practical.
t_andersen said:The principle of turbocharging is to make the engine "believe" that it lives in denser air with a pressure of, say, a couple of atmospheres. The engine sees a thicker air on the inlet side and at the exhaust ports. Because of the thicker atmosphere, you can burn, say, twice as much fuel in the same cylinder.
drmiller100 said:resurrecting an old thread, the above exactly describes why a turbocharger cna work very effectivelyl on a 2 stroke, and why a supercharger has such a very hard time.
I built a supercharger for a 2 stroke snowmobile. I learned a LOT doing it. I believe I am one of the very few to ever add a supercharger to a 2 stroke and have it end up making more horsepower when done. But when all done, it was very incremental gain. The secret was to plug the exhaust to build boost, counterintuitive at first.
Turbos by definition build back pressure as a function of front pressure, which is circular logic, and brings us back to t_anderson's excellent description of how to think about it.
Also, on sleds, you need to think big. stock 800cc's is 150 horsepower. If you want to add a turbo to one of these, the Holset turbo off of a dodge cummins is a good size to start with.
all that being said, turbo or supercharging a saw seems pretty counter intuitive.
-doug
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