Not that I know of, but there is an excellent reference available free online as a pdf here. It was written for motorcycle engines, so there are things that are not directly applicable, but it is an excellent overview of the considerations.
what is cylinder porting?
- Thread starter vamtjewboy
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Not that I know of, but there is an excellent reference available free online as a pdf here. It was written for motorcycle engines, so there are things that are not directly applicable, but it is an excellent overview of the considerations.
chunksofwood
New Member
milling
As far ar port work, I've done plenty. But only a tid bit on 2 cycles.
The moving of ports up or down should change the power curve up or down in respect to rpm. Which I don't know why any one would change.
The simple freeing up of flow restrictions should make it easier for the motor to run. If the motor has a hard time pumping air that costs power. And if the motor has a hard time it runs hotter.
I have an alaska mill 36 inch. powered by an older "ported"(not by me) 2101 xp. It mills fine, slow but you can't really stall the saw, even with great effort. So I know a little bit.
But in larger milling you need more torque. And don't need to care about wierd size or shape. Modification should be made in my opinion to the intake tract length for more ram air affect. Simply cramming more air into the sump, and better cylinder clearing. The exhaust as well. I hate to say but its probably about a foot, a cut aluminum base ball bat probably has about the proper included intake angle and length.
I have to caution that the dynamic compression ratio will change dramaticly, and could for all I know cause problems not relaited to over heating. Like the saw breaking in half or tearing the cylinder bolts from the case.
Look to a 125 cc bike, they have room for the package and the lengths are conciderable for the intake and exhaust. And the power of the motor is much more.
I guess in summation saws are made for simple cutting of wood not milling.
Buy a super 90 stihl.
spell checker won't work
As far ar port work, I've done plenty. But only a tid bit on 2 cycles.
The moving of ports up or down should change the power curve up or down in respect to rpm. Which I don't know why any one would change.
The simple freeing up of flow restrictions should make it easier for the motor to run. If the motor has a hard time pumping air that costs power. And if the motor has a hard time it runs hotter.
I have an alaska mill 36 inch. powered by an older "ported"(not by me) 2101 xp. It mills fine, slow but you can't really stall the saw, even with great effort. So I know a little bit.
But in larger milling you need more torque. And don't need to care about wierd size or shape. Modification should be made in my opinion to the intake tract length for more ram air affect. Simply cramming more air into the sump, and better cylinder clearing. The exhaust as well. I hate to say but its probably about a foot, a cut aluminum base ball bat probably has about the proper included intake angle and length.
I have to caution that the dynamic compression ratio will change dramaticly, and could for all I know cause problems not relaited to over heating. Like the saw breaking in half or tearing the cylinder bolts from the case.
Look to a 125 cc bike, they have room for the package and the lengths are conciderable for the intake and exhaust. And the power of the motor is much more.
I guess in summation saws are made for simple cutting of wood not milling.
Buy a super 90 stihl.
spell checker won't work
Logman1974
New Member
Hi there new here, i am looking to find out were i can get a 390xp saw worked over for the woods my 395xp just geting to heavy for my back i have herd that a good porting can make a big change.
dozerdan
Addicted to ArboristSite
I can do that for you. You may want to take a road trip some day and run a few of my saws. I am about 3 1/2 hours away from you, just east of Lewistown.
Later
Dan
