torence 20
ArboristSite Operative
anyone have a modified air filter with lotsa pics for a jonsered 920, we all know the stock filter set up is complete junkk
920
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SawTroll
Information Collector
No expert on this, but I believe a 930S cylinder would make some difference in performance. :msp_biggrin:
Unless the porting is dramatically different, a 930 won't provide much, if any, difference, as the displacement between the two saws is identical.
I wouldn't say that the 920 filter is junk, but the one on your saw might be. And you won't find a NOS one, so modding is your only option. Make a new, taller filter cover and get yourself some more surface area.
Or just use a sock.
920, a great saw, I've owned three, some claim they're a bit heavy, but I love em'.
I wouldn't say that the 920 filter is junk, but the one on your saw might be. And you won't find a NOS one, so modding is your only option. Make a new, taller filter cover and get yourself some more surface area.
Or just use a sock.
920, a great saw, I've owned three, some claim they're a bit heavy, but I love em'.
SawTroll
Information Collector
Afaik, the 930 cylinders exploit the port openings in the case, and the 920 ones doesn't - but that is just something that I read! :msp_wink:
Well, as far as I know, you're right, because all that I know of it is what you just wrote.
Regarding the origin of the post, I don't know why stock filters are so bad, besides that they're not available whatsoever.
Regarding the origin of the post, I don't know why stock filters are so bad, besides that they're not available whatsoever.
Actually the 930 is quite an improvement power wise. its pretty easy to get a 920 to run close to a 930....do what Jonsered did...mod the transfers where they meet the cases! I've gone around this block a few times and posted pics of the differences between the cylinders and even pics modding a 920 to match a 930. I have a few 920's and one modded to 930 specs. Spike has a really clean (and crisp) 930 which is the standard by which all those class saws wish they could measure (up to). We will eventually see if my 920 with the transfers cut and a muffler mod can stick with Spike's 930. Right now...50/50 in my mind. And yes they are heavy.. the standard 920 is a disappointment...if you have ever run a 930!
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Some pics. Won't say much as the experts should define this not me. Suffice to say I made three changes, one you can see and the other two you can't, both are "no-no's " But there is a noticeable increase in power. The one's you can't see, were to compensate "weimedog style" for increased case volume & compression adjustments. ...It worked well enough for me. :rolleyes2: But if I post it I'll be ripped to shred's LOL!
Stock 920. You can see the outline of the case transfer x-section.
Matched the 920 cylinder to the case. (Best way is to split the cases....and do half at a time) The Jonsered Modded ones just were cut straight with an end mill...no matching at all...but they worked! This pic was taken about 3/4 of the way to being finished (roughed out) to show in concept what was happening...more work was done. Also have to stress..I'm a hack! The real builders here would do a much better build.
A little further along next to a stock 820.
Testing to see if it would run. It did ( And still does). Picked up both RPM's and grunt everywhere. That beech is rock hard! Especially in cold weather. Not soft wood out here...
Stock 920. You can see the outline of the case transfer x-section.
Matched the 920 cylinder to the case. (Best way is to split the cases....and do half at a time) The Jonsered Modded ones just were cut straight with an end mill...no matching at all...but they worked! This pic was taken about 3/4 of the way to being finished (roughed out) to show in concept what was happening...more work was done. Also have to stress..I'm a hack! The real builders here would do a much better build.
A little further along next to a stock 820.
Testing to see if it would run. It did ( And still does). Picked up both RPM's and grunt everywhere. That beech is rock hard! Especially in cold weather. Not soft wood out here...
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SawTroll
Information Collector
Well, you are one of the experts, as far as I know - but I still hope that Spike will join in! :msp_wink:
Thank you for the complement..but I have no delusions of grandeur..:msp_smile: You on the other hand..have a wealth of knowledge....especially on that Swedish iron.
Couple of more pics that are relevant
Two STOCK 920 Barrels...one a later model and also what a 930 looks like ..take a wild guess!
Another one of my 920's...
It runs well too...Other side
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SawTroll
Information Collector
Thank you for the complement..but I have no delusions of grandeur..:msp_smile: You on the other hand..have a wealth of knowledge....especially on that Swedish iron.
Couple of more pics that are relevant
Two STOCK 920 Barrels...one a later model and also what a 930 looks like ..take a wild guess!
.....
I assume the late one will perform better, with the transfers going down to the case - but remember that I am no expert, and only relying on posts I have read before.
Later Husky xp saws adopted the transfers going into the case though, but those have four of them! :msp_wink:
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You can convert your 920 filter system to the 930 system, but in order to do so, you need the 930 top cover, air filter cover, intake elbow and air filter (same as 6-- series saws). It is an improvement, but probably just as hard to find as a 920 filter!
torence 20
ArboristSite Operative
i have a 930 jug and piston. so should i use the 930 instead? the bottom end on the 920/930 is identical rite?
Depends. If this is a hobby saw..put on the 930 and run it from time to time at GTG's. If this is a work saw...wear out the 920 top end first!
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1st main difference is the top cover and air filter cover. 2 screws on the air filter cover on a 930. 6-- style air filter on a 930. If you have those, than it most likely is a 930.
Also 930's use a "spring" type anti vibe vs. rubber grommets on the handles.
roncoinc
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ChainsawmanXX
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What kind of gains can be made in the 920 cylinder??
torence 20
ArboristSite Operative
yea mine is going to be a fire wood saw. i got all new bearings installed and case halves put back together now just gotta clean up the parts and pieces and prep for assembly
ChainsawmanXX
Addicted to ArboristSite
As far as porting it.
