2000ssm6
Stihl User
That is one bad A 7900 Frank!!:jawdrop:
7900 woods ported saw...finished!!
- Thread starter gink595
- Start date
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MCW
Somebody's talking crap here & it ain't the tree!
Thats an old wive's tale mate. Brad ported my second 7900 and it absolutely eats my stock 7900, both with the HD filter setups which also add to power.
That saw looks pretty strong in the vid, thats for sure. I suspect a pretty sharp chain as well though
Just have too remember that the guy who ported this saw has been porting them for along time..........
Gink should have plenty of fun with it ..........
Gink should have plenty of fun with it ..........
volks-man
Arboristsite.com Spooner
now, gink...........
after you get the new ring run in a bit and work out the kinks, you need to find a 25''-30'' tree for us to watch you hack to pieces!!!!
so far, i am liking what i am seeing.
:chainsawguy:
after you get the new ring run in a bit and work out the kinks, you need to find a 25''-30'' tree for us to watch you hack to pieces!!!!
so far, i am liking what i am seeing.
:chainsawguy:
Can this saw still be used as a work saw, run all day cutting firewood or dropping timber? Or is it pretty much just a GTG saw now? 35% gains makes me suspect that a LOT more than a woods port has been done to this saw.
Awesome saw, Frank!
Heat. You've still got the same cooling system putting out WAY more HP. The farther you go with the mods, the more it becomes of a problem. Some saws can only be used for 2-3 cuts and they have to be allowed to cool down.
ohh
is the depended on intake and exhaust port width or work done to transfers. or everything.
my 440 is as wide as i would want to go. portes traced on the piston are very close to the skirt edge , transfers could have been widend more but i im kinda new to trasfer grinding so i didnt go radical.
is the depended on intake and exhaust port width or work done to transfers. or everything.
my 440 is as wide as i would want to go. portes traced on the piston are very close to the skirt edge , transfers could have been widend more but i im kinda new to trasfer grinding so i didnt go radical.
I honestly don't know what would have to be done to get that kind of gains from a 7900. Traditional woods porting only gets you about 15-20%, and I don't build race saws. That's beyond my abilities. It would be nice to know what all he's done to get this kind of gains. But I'm not interested in limiting most of my saws to cookie cutting, if that's the case here. Maybe it's not.
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gink595
Addicted to ArboristSite
Nope no limiter, He did say there was no performance gain with the coil swap I just wanted it for the tuning ease..
I have no idea how much time he spent on it but my guess is quite a while. I don't think 35% was had in a evening
If we are ever to meet up at a GTG you can run it for a dollar a cut
Did he say anything about how hard you can work this saw?
gink595
Addicted to ArboristSite
Alright I'm going to try and put alot to rest on the cookie cutter machine. One of my things that I asked when I had him do this saw was to make it usable, cookie cutting is okay but I only do that once a year, this is my fireewood saw.
What is the one thing that will cause heat...compression right. This saw is well under 200 psi. That is more than I can say about the 5100 that I have, and I have cut with it pretty hard, nonstop for the short while I have owned it.
If I have to put this thing on the mill and video tape to prove a point I will to show that this is a woods ported saw, I've been guarenteed that I can cut firewood all day long, you've got to remember this isn't the first 7900 he has ever done, I'm sure he has a good idea on how far to push the envelope.
I only asked a legitimate question. Thanks for the answer. I'm just a little sceptical since gains like this haven't been seen before, not that I'm aware on a woods ported 7900 or 681. Of the 681s done in the build off done on the other site, none of them saw gains like this. I can't remember who all did them, but they weren't all rookies. Just curious. And don't take my questions personal Gink. They're not aimed at you.
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gink595
Addicted to ArboristSite
That saw looks pretty strong in the vid, thats for sure. I suspect a pretty sharp chain as well though
Yes it has a sharp chain on it your not supposed to cut with dull chains that is hard on the saw...
It was the same bar and chain that was used in the stock video... I believe it was off the roll Oregon.
Perhaps he's found a piston with wider skirts, or added additional transfer ports? Reguardless, you're going to love that saw! That saw will walk all over a 660! Like I tell people, once you've run a ported saw, there's no going back. You'll be sending him the rest of your saws before you know it
Well Kevins 7901 ran pretty stong and it was better than 15% gain after being modded..........Im willing to bet the modder knows a fair bit about building saws.....
My Zebra 2149, 358,375 and one of my 084's had been blessed by him
.
Well Kevins 7901 ran pretty stong and it was better than 15% gain after being modded..........Im willing to bet the modder knows a fair bit about building saws.....
My Zebra 2149, 358,375 and one of my 084's had been blessed by him
.
I'm not questioning his abilities in the slightest. He's a brilliant saw builder.
