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O/T: Chainsaw fuel economy

T

tjdub

Member
I'm not really concerned with how many gallons they use so much as how much I can cut per fill up. Kind of arbitrary I know, but I've noticed that a lot of the newer saws seem to need constant fill ups.

I have an old Jonsered 930 and I have nothing bad to say about it. Just a great saw, but like all things mechanical it breaks. So while that was down I borrowed one of my Dad's newer Jonsereds and found out I had to stop and fill the saw 3 times to get a pickup load of wood. Normally, I don't even take gas and oil with me since my 930 typically cuts a whole load on one tank.

I'm going to have to replace this saw someday, so does anyone have advice about which newer saws have the same stamina as my old Jonsered?
 
Probably the tanks are smaller to make the saw lighter when full, but as far as cutting a pickup load on one tank, results vary according to what you're working on- or if your chain isn't as sharp- if this was a one or two time experience.
 
Let"s make sure were comparing apples to apples.
You have a Jonsereds 930. What was your Dad"s Jonsereds model??

Jonsereds Model 930 has an 87 cc engine and 33.1 fl.oz fuel tank.

Newer Jonsereds 2094 has a 94 cc engine and 30.4 fl. oz. fuel tank.

A newer smaller Jonsereds 2051 has a 50.8 cc engine and only 17.2 fl. oz. fuel tank.

So what size is your Dad"s chainsaw to your 930??
 
Additional note: I have a Jonsereds 70E and a Jonsereds 910 that I've used. Some of the fastest cutting chainsaws I ever ran. Sharp sawchain and smart cutting/bucking decisions are the keys to production of getting the wood out.
 
I have an 021 Stihl and can cut one tree that is about 1 ft in dia completly up, top and all on one tank and have a little gas left over. I have a larger wood boss Stihl and it is more of a gas hog. I just use it to drop em or cut up logs that are too big for the 021.
 
I actually used two of the Old Man's saws: 2171 and I think 2065? was the other. Both saws seemed to go through tanks of gas at about the same rate.

I did a little research on fuel capacity vs displacement for Jonsered, Stihl, Husqvarna, and Echo on their websites and strangly the Husky/Jonsereds seem to have the biggest fuel capacity in the 70-80cc class. In the 70cc models, the fuel capacity is almost double the Stihl.

I'm wondering if my 930 just does so well because it doesn't run at nearly the RPM of the newer saws?
 
Then, your Dad"s chainsaws would be:
Jonsereds 2171 with a 70.7 cc engine and 25.9 fl.oz. fuel tank.

Jonsereds 2065 with a 65 cc engine and 23.6 fl. oz. fuel tank.

Yes, your older Jonsereds 930 has more fuel capacity at 33.1 fl. oz.
 
Thanks for looking up the numbers MGTPa.

I guess I'll just stick with my old saw and keep an eye out for another just like it.

I noticed Husqvarna has a new engine in some saws called X-TORQ that is designed to be more fuel efficient by 10-20%. Of course they probably reduce the fuel capacity to match :)
 
As far as the RPM,
your Jonsereds 930 spins over at 9,000 rpm.
Jonsereds 2065 spins over at 9,000 rpm.
Jonsereds 2171 spins over at 9,600 rpm.

Most chainsaws cut in the 6,000 to 8,000 rpm range when under load.

Interestingly, the Jonsereds 70 models spun over at 11,300 rpm. Very well built durable chainsaws. You just couldn't wear them out if you properly maintain them and ran the correct fuel ratio.

Sort of like the old Stihls 051, 056 & 076 models back then too. Not much composite plastic on those Jonsereds, Huskys and Stihls back then. They were made to work, be durable and cut wood. And yes, they weighed several pounds more.
 
> your Jonsereds 930 spins over at 9,000 rpm.
> Jonsereds 2065 spins over at 9,000 rpm.
> Jonsereds 2171 spins over at 9,600 rpm.

I would not have expected that. Maybe it's just the sound/muffler difference, but those newer saws really seem to wind up much higher than the 930. Or perhaps there's a carb/linkage "problem" on my 930 that is making it so fuel efficient. It seems to have loads more power compared to the other saws though, so I don't know if that could be it.
 
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