I haven't had the issue on 390's. Never tried it on a 395.
Like I said, it's only with a richer tune running a 32" bar with an aggressive chain on a 365 and 372xp.
Porting Farmertec 372xp BB
- Thread starter morbius18
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Like I said, it's only with a richer tune running a 32" bar with an aggressive chain on a 365 and 372xp.
morbius18
ArboristSite Operative
Thanks for your reply, that's what I was thinkin, but I was making sure that I understand what I'm doing and why.
I recently made a degree wheel and this is the first cylinder that I've reworked. Other than just widening ports and opening up the tracts.
Mike Gott
ArboristSite Guru
Interesting, I haven’t experienced any issues like that. I’ve only 6 of them on though, 4-2171’s,2186,&2188. Eric actually did something to the carb on the one he ported for me but I can’t tell any difference in it. My biggest issue is the fine line between pig rich and lean. They are really touchy to get just right for me anyways
Mike Gott
ArboristSite Guru
Also, mine always has at least a 28” with 8 tooth, full comp square bighty chain or 32 an 36 when needed. I do a lot of full bar length noodling with a 28 and 32
Gypo Logger
Timber Baron
A bit off topic, but I've been working on a 385 that's been ported with 22 thou taken off the base.
Anyway, with a stock piston and 20 thou base gasket, it's a head banger.
Somewhat elementary, would a 40 thou gasket smarten it up?
The original jug came with a pop up slug.
The figures are as follows:
Intake:165 66.5 mm
Ex: 24 mm
Tr: 130 29 mm
Bye the way, it's just 20F here now, no snow on the ground, Blaze King blazing. 80f in my shack right now.
Been thinking about flinging doors and windows open , cracking a liquid refreshment and cranking up the tunes.
Anyway, with a stock piston and 20 thou base gasket, it's a head banger.
Somewhat elementary, would a 40 thou gasket smarten it up?
The original jug came with a pop up slug.
The figures are as follows:
Intake:165 66.5 mm
Ex: 24 mm
Tr: 130 29 mm
Bye the way, it's just 20F here now, no snow on the ground, Blaze King blazing. 80f in my shack right now.
Been thinking about flinging doors and windows open , cracking a liquid refreshment and cranking up the tunes.
Mike Gott
ArboristSite Guru
How much of a head banger? Lock up and won’t go any more or a light tap? How big was the old pop up. Best thing to do is figure your squish and go from there? You can put 0.040” gasket in and measure to see what you have
Gypo Logger
Timber Baron
I didn't get aggressive enough to see if I could get it to rotate past tdc. I do have a ballpeen around here somewhere.
I'd do a squish if I had any solder handy.
As you mentioned, I'll try 40 thou+ bg.
Will keep you posted, as I think this saw is a potential ringer, or gernade.
I always told the wife when she turned 40 I was gonna trade her in on 2 20's. For whatever reason, that never happened.
So I guess you could use 2 .020" gaskets instead of finding a .040
morbius18
ArboristSite Operative
Here's what I ended up with. The transfers had no bevel at all and were all at different heights. They were skewed similar to the exhaust. I corrected it the best that I could.
I had to take the intake to about 98* in order to add a slight arch.
Transfers were taken to 123*
I didn't spend a lot of time on making it pretty. I'm convinced that I paid huztl/farmertec to take advantage of me by purchasing this. Never again...
I had to take the intake to about 98* in order to add a slight arch.
Transfers were taken to 123*
I didn't spend a lot of time on making it pretty. I'm convinced that I paid huztl/farmertec to take advantage of me by purchasing this. Never again...
Gypo Logger
Timber Baron
Your work looks good. Don't worry about pretty. Pretty is as pretty does. It will be nice to see vids when your done.
Gypo Logger
Timber Baron
I hear ya, so twenty is tight, 40 is ok, but 60 may be to loose?
Probably
All depends on condition!
And the size of your solderAll depends on condition!
D
Deleted member 150358
Guest
I did my 48mm Tecomec like this:
100 exhaust
117/122 staggered transfers prim/sec slightly champhered towards the intake.
77 intake
Squish just came out about .021
Runs out nice. Prefer it to stock open transfer cylinder (1997 model 2065) with a 20" bar.
Plan to try a Meteor 630 windowed piston with a little popup next. Figure the added heat of the popup should be mitigated by the lighter windowed piston. My intake might be excessive no worries have another cylinder if I have to start over.
Had originally wanted a 24" bar for this but have another saw setup pulling a 24" 8-pin so it isn't needed. Keeps it pretty nimble with the 20" for its size.
100 exhaust
117/122 staggered transfers prim/sec slightly champhered towards the intake.
77 intake
Squish just came out about .021
Runs out nice. Prefer it to stock open transfer cylinder (1997 model 2065) with a 20" bar.
Plan to try a Meteor 630 windowed piston with a little popup next. Figure the added heat of the popup should be mitigated by the lighter windowed piston. My intake might be excessive no worries have another cylinder if I have to start over.
Had originally wanted a 24" bar for this but have another saw setup pulling a 24" 8-pin so it isn't needed. Keeps it pretty nimble with the 20" for its size.
morbius18
ArboristSite Operative
I've got an OEM 48mm and OEM 50mm. I'll do the exhaust on the 50 similar to the 52 mm.
My issue with this one is horrible squish. .037" without gasket. it's close to what a stock cylinder with gasket would be, so I thought I'd give it a try, and practice a little. Long term, this one will be coming off for the 50mm oem.
98 exhaust is fine. I shoot for 98-100.
I don't like that much blowdown on a 372. Take them up to 118-120.
I don't like that much blowdown on a 372. Take them up to 118-120.
I would set the squish between .017"-.020".
