We’ll stay in safe waters with this question. A couple times a year I get really big trees given to me so I want to get a bigger bar for one of my 7900. The bar won’t be used all the time, just on the big donations, usually 3’- 4’ dia oak, occasional maple. Should I get a 28” or 32” bar and what chain. Probably going to Nate’s shop to bounce it off him and make my purchase there but would like to hear your opinions. Thanks.
It will do fine running a 32 with full comp chain but will slow in root flares and very dry dead wood when buried, and may also not oil well(at least to me) in very dry wood when buried with a 32. It will pull a 36 full comp no problem if you are not heavy handed with it but will not oil it well. If you get a 36 you can mod the oiler and then it will keep up no problem.
It will pull a 28 and oil it just fine, nice bar to have on one, then a 24 on another and a 20 on one as well
.
I had a 28 on one of mine a while ago and at low rpms I couldn't keep the chain spinning it would just grab hard and stall(big dawgs working at shoulder height and a chain with the rakers a little low), so I spin it up and worked my way through what I needed to do, later that day I realized I had an 8 pin sprocket on
). It did fine bucking, I was just having a hard time getting the top cut on a hard leaner started
. This was a stock saw running an 8 pin and a 28" full comp B&C.
32" bar and skip tooth chain.
If you are going to have a 'just-when-it's-needed-bar', it might as well be the bigger one. Cost difference will be negligible.
Does not have to be a lightweight or an ultra fancy bar due to it's limited use. Skip tooth for chip clearance in the bigger wood and to reduce the load on the saw if you bury the bar.
Nate fixed me up with a nice one at a very reasonable cost for mine.
Philbert
Pretty sure the 7910 wouldn't have a hard time pulling a 36 with skip as that's like and 18 with a little extra weight.
You have a 32 with skip on a 7910, what bar do you run on it normally, or is that your normal bar for it.
Not sure what your oiler is rated for, but I don't like more than 28" on a regular basis, but always kept a 36" B+C around for my 460s for when I ran into large Oak, etc (some of them exceeded the 36"). I would go with 36 if your saw will handle it, but would only put it on when you need it. Also, long bars are great for stumping.
I like full comp, but my saws are ported. Semi skip also cuts very well. If you saw is stock, full skip may make more sense. Also, I pay the extra for the light bars, IMO they are worth it. Much easier to line up your cut when felling, etc. Long bars can be tough to control in those situations.
The oilers do fine on the 7910, better than most 460/461's I've had, I did have one that was modded, it would have oil dripping off the bar with a 24 on it set in the middle cutting green wood
.
Here's a link to the mod I have saved on my computer, I've got other info that may not be in this thread if you don't already have it and would like it(I see you were already in that thread, probably before me
).
https://www.arboristsite.com/community/threads/044-046-oiler-modified-illustrated.275634/
I wouldn't mind a light 36"
, probably go with a Stihl 3003 mount and then run an adapter so I could switch it back and forth between all the brands. The 36's I have are heavy for sure, but they get the job done well
.