porting my 372

[parrisw]

Looking pretty good. How far under 140 are you? Don't think 372's had high compression new. What's your squish at?

 

[Evan]

to be completly honest i have not checked squish.

dont shoot me

 

[parrisw]

to be completly honest i have not checked squish.

dont shoot me

BAD BOY, but you still should be fine. Squish is pretty high on a stock 372.

 

[Evan]

ill measuer and if its still way up theyre ill have it milled or decked or maybe chuck in a lathe and do it myself.

 

[parrisw]

ill measuer and if its still way up theyre ill have it milled or decked or maybe chuck in a lathe and do it myself.

Yes, I need a lathe for this purpose!!

 

[Evan]

i dont have one, but i have freind that does maybe well figure out how to get it chuked up .

im lookin for timberwolfs pics now but im about to give up with the search engine, im tired and the search in is kinda the last straw

 

[husky455rancher]

i had a 372 a while back. she definatly had some hard miles on her and was completly stock. she blew 150 psi. my 066 is at 140 maybe ill throw a new piston and rings in it sometime but im not in a hurry.

 

[parrisw]

i dont have one, but i have freind that does maybe well figure out how to get it chuked up .

im lookin for timberwolfs pics now but im about to give up with the search engine, im tired and the search in is kinda the last straw

Ya, to do a cylinder on a lathe. You will need to lathe up a mandrel that fits inside the cylinder perfectly, out of aluminum. Then drill and tap a hole that lines up with the exhaust port, and run a bolt and washer in there to hold the cylinder to the mandrel. At least that how I think its done. That's how I'd do it anyway.

 

[timberwolf]

It's a good way to do it.

This is where having at least a 10-12 inch swing on the lathe and some slower gears is needed. Pretty much need to work over the crossfeed and some jugs are quite unbalanced so best to turn them fairly slow.

 

[Evan]

timberwolf

thanks for the pics, thats what i was lookin for

 

[Evan]

compression jumped about 15 psi after letn her scream wot for alittle bit last night.

i just took a reading a few minutes ago. this is cold havent ran the saw today. maybe it wont be as bad as i thought and the new ring does need some time to seat it self.

this looks much much better.

mesn around with posting pics straight from photbucket

can you see these last two pics?

 

[blsnelling]

Ya, to do a cylinder on a lathe. You will need to lathe up a mandrel that fits inside the cylinder perfectly, out of aluminum. Then drill and tap a hole that lines up with the exhaust port, and run a bolt and washer in there to hold the cylinder to the mandrel. At least that how I think its done. That's how I'd do it anyway.

Nik just uses 100 PSI on a live tail stock. I think I named that part right

 

[blsnelling]

compression jumped about 15 psi after letn her scream wot for alittle bit last night.

can you see these last two pics?

It really doesn't sound like there's anything wrong with your P&C. Yes, I can see all the pics.

 

[stihlboy]

:agree2::agree2:

 

[Evan]

when it was blowing 135 thats a shade low.

ill live with 150. its hot now ill check compression in hour or so and she what it says i wouldnt bet against the needle pushn past 150 this time.

 

[parrisw]

Nik just uses 100 PSI on a live tail stock. I think I named that part right

HUUUU??? please elaborate?

 

[timberwolf]

I assume he means usinging the live center in the tailstock and putting some extra pressure on the top of the cylinder against the mandril to lock it against the mandril by friction. Must have some fancy lathe with a load set and readout on the tail stock?

I have turned a couple jugs like this, but would not say it's a good idea, too easy for something to move and then you spin the mandril in the bore which can cause damage to the bore, squishband or cause the cutter to catch and mess up the finished surface on the base. Time well spent to secure the jug to the mandril IMHO.

 

[Evan]

bucked on tree with the 372 today. 20" tree. ity took a tank and half of fuel. i had screwdriver in my pocket and kept going richer. as she kept getn stronger.

i have never seen a saw like this. when i started bucking it was only running so so. after buckn a few rds im like whow so i pull it out of the wood and she not burbln at all so i get burble and work down the tree a ways saw just screamin.

pull it out of the wood again and a slight barely noticable hint of a burble so i give her alittle more. as im getn cautios now knowing its needn more fuel as were workn our way up this tree.

when I finaly got to the big end of the tree i was laying into the dogs hard and it was chugn right along. and would burble when i lifted to get another bite on the dogs. my eyese were twinkling bright as i finished. didnt want to stop cutn cause it was running so good and getn to end of the tree means its time to load the truck.

i havent checked compression yet but i wouldnt be suprised to see 160 now

though i know its running good and strong im not sure if its cutn any faster then my 044 thats not ported. but i just rememberd i havent modded the muffler yet so theres still hope that itl out run the 044. the 044 is running very well with a muffler mod

anyways thats it for now. i was scoutn a new area and didnt find but a few trees i only cut the one just to run the 372 no pics or vid. i figure everyones getn tired of them.

i may do a 044/372 timed cuts at the wood pile one of these evenings just so i know for myself.

ahhhhh k now im done

Evan

 

[Andyshine77]

Without opening up the muffler you're not going to gain much from the porting. More air/fuel in = more out. Open up the muffler than report back. BTW Your port work looks good.

 

[Evan]

Andy

thanks

yeah i know the muffler needs opend up but i havent had time to do it . i havent even decided what kinda modd im going to do. its going to be single 1" round exit port. i gota figure out how to do it