Author Topic: Poulan 46cc Porting Plane conversion  (Read 1884 times)

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Offline Spruce_Goose

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Re: Poulan 46cc Porting Plane conversion
« Reply #10 on: August 04, 2014, 09:14:33 pm »
Quote
First I have removed the metal piece or heat shield in the exhaust and then widened the exhaust port to eliminate the step.

That's about what I had planned. The only issue I see is that the top step will still be there. I assume this is not ideal for it will create eddies. Is there a way to smooth the step without actually removing it entirely causing timing changes? Maybe just a bevel. Or adding material in that little crevice even? I didn't plan on touching the intake unless it makes sense to do some sort of balancing...

Quote
Like 660 said you should look for mods that give torque but not RPM.

Does widening ports actually increase torque or is it only RPM really?
8,000 rpm isn't too far off cutting-saw peak performance is it. Don't many saws peak power at around 9,000 rpm? For planes is it that they want lower rpm simply because a super high speed prob is less efficient than a larger more consistent speed one with more load/force output?

In regards to the intake... this probably will show my ignorance, but do some saws use one way valves and others don't? As far as I can tell there is nothing stopping flow back out the intake of the cylinder through the carb. No valve that is. But I've heard of some of that physics stuff that describe why most of the fuel air doesn't blow back out...:)

 

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