Porting Husky 340/345/350's

[farminkarman]

Good morning fellas. I have been gathering up a collection of these small plastic husky saws to do some hackery on. I have enough new & used 346 jugs that I could do conversions on all of them, but I already know I can make a pretty stout firewood getter with the 346 package. Out of the bunch I have, two of the saws have good 45mm jugs with the removable transfer covers. Any of you guys done a side by side comparison of a ported 346 top end with a ported 350 (with flat top piston)? I will probably do some with the 346 and do at least one with the 350 just for fun...unfortunately I don't have any good logs to do a comparison with...maybe more dyno opportunities?

 

[redline4]

Get your slacker azz up to Steve's GTG and you will have test logs a plenty.

 

[Woodslasher]

I think Snelling built a pretty hot 350 back in the day, I'd see if you can find his old build thread and video.

 

[farminkarman]

I think Snelling built a pretty hot 350 back in the day, I'd see if you can find his old build thread and video.

I'll see what I can dig up. I'm not looking to re-invent the wheel...just really want to see if the 350 jug can give the 346 top end a run for its money....else they will be headed for the scrap pile.

 

[Woodslasher]

Snelling and @Mattyo seem to be the two guys with build threads I've seen.

 

[wcorey]

My experience has been that a ported 350 jug runs pretty close to a non ported 346 with mm, bgd, and timing adv.

 

[Kiwioilboiler]

I did a simple 353 with the 45mm jug Greg. Hyway poptop (never again) and knocked the rough edges off the lower transfers. Ran really strong, I'd say more forgiving than my MMWS346.

346 stayed tho, 353 did not, fwiw.

 

[Mattyo]

I'll see what I can dig up. I'm not looking to re-invent the wheel...just really want to see if the 350 jug can give the 346 top end a run for its money....else they will be headed for the scrap pile.

i pulled apart a Brad Snelling 350/346 on my youtube channel. it ran really well. he did a nice job porting it and assembling.

 

[isaaccarlson]

I don't have a 346 to compare to my ported 350, but the 350 pulls hard and cuts fast. The transfer caps make it a breeze to port. Mine was at ~160 before the first start and I have not checked it since. It has some hours on it since it was built and still pulls hard.

My intake is 74
Exhaust is 104
Transfers are 123

I picked up another one and will most likely port it this summer. I'll use the lathe to bump the compression to ~185 and run the exhaust at ~102 with a blowdown of about 20, since there is just a little backwash in my transfers at 19. I like a low exhaust for torque, but it's hard to put enough bar on these critters to need it, so you might as well run em fast and let em eat wood. I used a lot of jb weld in my last one to smooth out flow in the transfers, and I'll do the same in the next one. I love hitting the trigger and the saw jumps right to the top. You don't even hear it rev, it's just there. I run .325 chain on mine, but I have to work them over to keep them from clogging with chips in the cut. I run my depth gauges at ~.030-.035" and the saw just starts to slow down with the bar buried in really hard wood. With the gauges at .025", it just screams.

 

[farminkarman]

I'll see what I can dig up. I'm not looking to re-invent the wheel...just really want to see if the 350 jug can give the 346 top end a run for its money....else they will be headed for the scrap pile.

Not that anyone cares to hear about a husky 350, but I thought I would share my findings after porting three of them with varying recipes. The one that that I was happiest with ended up as follows:
Cut 0.050” from the band
Meteor flat-top piston
Ex: 107
Tr: 125, 128
In: 77
This saw gained about 65% over the stock 350 I have used to compare to.

 

[isaaccarlson]

Any idea what it was running in the cut?

 

[farminkarman]

Any idea what it was running in the cut?

I didn’t tach it in the cut. I would guess somewhere between 11.5 -12K

 

[isaaccarlson]

I'd be interested in a video if you have one. Mine runs right around the same rpm with a standard chain.

 

[farminkarman]

I'd be interested in a video if you have one. Mine runs right around the same rpm.

I’m not sure when I will have another one to take a video of. The three I built have moved on to new owners. The one I have in the works now is getting a 346 ne top end.

 

[thedude74]

Not that anyone cares to hear about a husky 350, but I thought I would share my findings after porting three of them with varying recipes. The one that that I was happiest with ended up as follows:
Cut 0.050” from the band
Meteor flat-top piston
Ex: 107
Tr: 125, 128
In: 77
This saw gained about 65% over the stock 350 I have used to compare to.

Oh...but some of us do! Very helpful.

 

[thedude74]

Husky 350 45mm and 353 flat top. Stock #s with BG 103* ex, 130-131* Tr and 69* in, .038" squish.

Currently cutting squish band.

 

[thedude74]

View attachment 370127Thinking of widening lowers a bit and matching to base gasket/adapter (marked in blue)

 

[thedude74]

The removable transfer caps are nice.


The torx SECURITY screws.....gay as chit. I can see using them on Wally world chitter stalls....but on a saw? ......anyway moving on....

 

[thedude74]

The saw came to me with a scored piston....and a really dull chain(cause of scoring?? ) I originally replaced the piston and cylinder with a cheap$20 Amazon kit....complete with rim conversion...base adapter and some other misc. crap.....After cleaning the aluminum transfer on the factory cylinder it turned out real Purdy...swapped it on the saw....runs good. So I decided to build a jig for the table router...took (edit for dyslexia) .023"off the aftermarket base adapter.
Measured accuracy after the cut and a couple passes over 240 grit is .001"....good enough

 

[thedude74]

Sure is a lot of square sharp angles around the lowers. Maybe rounding the corners out a bit would be benefitial to airflow at the cost of slight loss of case compression? What do you guys do with these? Thoughts? Suggestions?