Chainsaw Repair

Plug in "port mapping" at the top of the forum in the search feature. Joe has that in his thread

Found another similar thread, figured I'd connect them.
http://chainsawrepair.createaforum.com/husqvarna/359357xp/30/

Can merge threads if needed?

I have a 359 with 357 top end (no stuffers). Not ported yet, but squish set at ,020", 200 psi. Good runner, but not very impressive. It'll get ported at some point.

I also have a 357 (w/stuffers) that I ported (basically just widened the ports, opened up the exhaust & matched the lowers to the case, no degree wheel), 190 psi... It's an animal! Much stronger/faster than the other one.

Both these running walbro 199 carbs.

I had planned to add stuffers to the 359, but I guess I need to port if first and see?

EHP, is there a big difference in how one ports one of these if stuffers aren't used?

the 359 is probably the biggest gainer in power with porting of pretty much any saw . Yes there is a lot of different ways to port or machine the cylinder and everyone has their own way , My way is different than most , its a dam worksaw not a racesaw so build the saw to last under hard use so no high compression as that doesnot help really , At low rpms big compression builds torque but hurts the motor as it tries to turn a higher rpm and live , big compression builds big heat  that's some thing a worksaw cannot live with, ya sure if you go out and make a couple cuts and then shut it off and talk about it but that's not a worksaw . . The first 359 I ever ported or seen came fro  Baileys and was for a guy to go to a GTG we were having , it was to be a 357 but they sent a 359 and it got to my place 3 days before GTG and I was working a full time job . There was no way of getting a 357 in time so I ported it in one night as that's all the time I had  . That saw won its class by a mile . Where you really learn about crankcase volume is once your running alcohol/nitro , take a saw that has a full circle crank in it and run it on that fuel, in a lot of cases you donot even have to mad the carb to pass more fuel as the crankcase cannot move fuel , now put a normal crank in that same saw so the only thing you did was the crank , saw willnot even run in most cases cause not enough fuel compared to the amount of air the motor can now move . So now you need to do a lot of mod work to the carb but it will pull hard once you get enough fuel to it . Because your not running huge compression you need to do a lot more port work to help and your motor will have a higher rpm torque band

Jump to 4min 10 seconds for 2 cuts in dry sycamore cant with Big Dave Neiger woods port 357xp with crank stuffers.  Was 180psi with pop up piston, intake was a little low.