390xp ported

[Petemate390xp]

Hi all just got in from the work shop went out there to have a tidy up and looked at the 390 and thought hey lets have a look in side the exhaust:001_smile:there was a baffle with one hole in it. i started here and drilled another one to the right the same size then i had a look at the exhaust exit i made this half as big as the existing one then i welded a bit of pipe to make a port.fired the saw up and thought it sounded like a yz 125, tweeked the carb up and went to the log shed all i can say is it's LOUD and HOLY S**t it's fast through the timber tried it out on some oak which has been down 7 to 8 years :001_smile: i dont mean just a small bit of oak, its currently running a 28" bar with LPX chain. Sank it into a butt, it just never died, even had both hands on the back handle at one point. Truely transforms the saw!!! Not sure if i'm going to hear my radio headphones any more

[Mr Ed]

Yup, porting a saw is a lot of fun. Done most of mine, my 372xp runs like a scalded cat

[swe#kipp]

it's nice to get a bit more out of your tools

"All" my saws are done and it really makes a difference in power and cutting times !

and as a bonus the engine runs cooler

[High Scale]

Ported my mates 026 yesterday as a little extra after fitting a new chassis, fun stuff.

[nuggsy]

does this not cause stress on the engine ? overheating etc ?

[Pete Mctree]

does this not cause stress on the engine ? overheating etc ?

 

Heat no. With the constriction of the muffler removed it actually reduces the head in the piston/cylinder as the saw can expell the hot waste gases more efficiently.

 

There is going to be a little more stress on the engine, but not that much, as your are not increasing the rpm thatthe saw is runing at but the torque

[nuggsy]

so will proting reduce the life of the saw ?

ive been hearing alot about exhaust mods etc for more power and if there are more pros than cons il do it 2 my saw wen i buy 1 or 2 or more

[Petemate390xp]

well been working all day with the saw and it Rips it UP been working with ceder of about 26-30 inchs what a saw, it makes a world of difference :001_smile:and yes i can hear my fm too:001_cool:

[snowy]

quite fancy having a go at porting one of my 357xp's any tip?

[swe#kipp]

This is what I did to my 357xpg and it works nice, it's a 16mm pipe and gives a healthy boost to the saw