Diesel chainsaw?????? YES or No?????

CAPORAL30 · 9th April 2008, 10:41 AM

Does it exist....many might have ask this question? other's would think it is impossible!!!!!!!!!!!!!

The answer is ...YESSSS!!!!!!!!!!!!!!!!!!!!

My latest acquisition...very rare in America.....COMET COMO "B" .

Diesel chainsaw do exist and i am the proud owner of one. The russian did not invent anything but like the chinese copying the russian druzzba chainsaw and selling them as new, i was in china last fall and have seen it...we are going into a world of buyer beware!!!!! they even make true copies of huskvarna and jonsered chainsaw.

Coming back to the diesel stuff, Although a very light and innovative saw, sales were not what the inventor Mr. Wiig had hoped for, so, he took his idea to neighboring Sweden. A company called Como... M. T. Bjerke would now build the Comet in Sweden. This occurred in 1950. The Swedish version of the Comet was called model B.Production of Comet is approximately 1,000 between 1950 through 1953. Verry light saw, 32oz would make her run for 1 1/2 hr....It is a 2 cycle engine that uses an injector type of carburetion system with a glow plug called a tandror working out from propane gaz under pressure inside the handle assembly.
Comet was pruchased by Jonsered and did produced another model...the RACKET XA injector saw. Technology was too advanced for those days and even if those saws could run on diesel fuel, kerosene or gasoline mixed with oil, the production was limited and ceased in 1960.

Hope this was of some interest.......

My collection: vintagechainsawcollection.blogspot.com

Alain,

JohN Dee · 9th April 2008, 12:18 PM

Thanks for sharing Caporal. Very interesting, besides the fact that if they did market it, I'd have to start bloody carrying an extra container of Diesel :P

It is very hard to imagine someone like Stihl, making something as compact as a 200T, a diesel engine.

Although I could imagine something like an 880 or a 3120 as a diesel...

newguy18 · 9th April 2008, 01:31 PM

Thanks for sharing,do you think its safe to use around power?

ScottWojo · 9th April 2008, 03:23 PM

I cant remember where I read it but any saw will run on Diesel if you get it hot first and you adjust the squish properly.

Scott.

CAPORAL30 · 9th April 2008, 11:17 PM

This is an interresting question??????????????????????

I would like to see that being a miracle..................a nice theory but impossible to my knowledge since diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously.
A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1.

it is not feasable with the engineering design of the chainsaw.

I have seen some diesel engines that would run on gas for startup....with a decomp valve and then when hot enough ...would turn to diesel operation but never the opposite(CR is too low).

on standard chainsaw...better have a strong rod.....

Alain,

/www.csgnetwork.com/compcalc.html

SawTroll · 15th April 2008, 11:36 PM

Here is the story of the Diesel Chain Saws, written by no less than George Blake.

Since he wrote that, there has been documented that some Comet "A"s were made in Sweden, and some Comet "B"s in Norway - but most of the parts probably were made by Jonsereds anyway......

olyman · 23rd April 2008, 02:23 PM

caporal---and how did you find out about, and purchase, this rare gem????

CAPORAL30 · 24th April 2008, 05:32 AM

Quote:

Originally Posted by olyman

caporal---and how did you find out about, and purchase, this rare gem????

This was a private sale through many contacts i have outside of the internet stuff.

Therrin · 24th April 2008, 04:02 PM

is that a fancy way of saying "a garage sale"??

Incidentally, I was over at a guy's place this evening returning his socket set. (a WW2 set that runs up to 4") He's also a tractor mechanic and he's been helping my friend and I as we've been rebuilding the hydraulic swivel motor on the excavator.

Anyhow... we got to talking about saws and he showed me his old Stihl 041, and as I was ogling it with my eyes, he brought out his 1940's homelite... that thing weighed a ton!!! What a bitchin saw though.

I'll have to ask him about the diesel saw thing.

CAPORAL30 · 21st May 2008, 10:02 AM

Let me know what you find...i know for a fact that my saw was produced in the number of 1,000...........how many are left in this world...who knows>>>>>>???????????????

Alain,

Quote:

Originally Posted by Therrin

is that a fancy way of saying "a garage sale"??

Incidentally, I was over at a guy's place this evening returning his socket set. (a WW2 set that runs up to 4") He's also a tractor mechanic and he's been helping my friend and I as we've been rebuilding the hydraulic swivel motor on the excavator.

Anyhow... we got to talking about saws and he showed me his old Stihl 041, and as I was ogling it with my eyes, he brought out his 1940's homelite... that thing weighed a ton!!! What a bitchin saw though.

I'll have to ask him about the diesel saw thing.

JayD · 21st May 2008, 10:13 AM

---

JohN Dee · 21st May 2008, 10:15 AM

Hey Cap, how do you go when your saw runs out of diesel? Do you have to prime it up like a mofo for it to start again?

CAPORAL30 · 21st May 2008, 10:37 AM

Diesel is combustible when mixed wit hot air....since the engine is already hot the air mixture with the diesel at he injector permits to spin the flywhell by hand and it should start the engine ...but i have never tried it...

...OR SIMPLY USE THE CRANK......

Alain,

jokers · 9th June 2008, 03:33 AM

Jonsered produced two variants of the diesel chainsaw, one used a small propane heater and another used a battery powered glow plug arrangement.

CAPORAL30 · 9th June 2008, 04:06 AM

Quote:

Originally Posted by jokers

Jonsered produced two variants of the diesel chainsaw, one used a small propane heater and another used a battery powered glow plug arrangement.

You are right but this model was the First Diesel chainsaw ever made.....only 1000 in production...Jonsered made copies of it. As i stated previoulsy.....Comet was pruchased by Jonsered and did produced another model...the RACKET XA injector saw.

Alain,

jokers · 9th June 2008, 06:22 AM

Hi Alain,

I did not intend to say Jonsered was first, I was simply replying to the question of how the combustion air is heated on a cold saw and referred to Jonsered`s two methods.

CAPORAL30 · 9th June 2008, 08:36 AM

jokers....you are right...

SawTroll · 10th June 2008, 12:48 AM

Quote:

Originally Posted by jokers

Hi Alain,

I did not intend to say Jonsered was first, I was simply replying to the question of how the combustion air is heated on a cold saw and referred to Jonsered`s two methods.

Right, and btw Jonsereds probably made most of the Comets as well, before they took over completely and further developed the design.....

chadd · 28th June 2008, 03:36 PM

Quote:

Originally Posted by ScottWojo

I cant remember where I read it but any saw will run on Diesel if you get it hot first and you adjust the squish properly.

Scott.

we had a problem with that 2 weeks ago in camp, 4 jugs went out on the hill that were diesel instead of mix. the saws ran for a short while, poorly, b4 they blew up. one day, 4 saws dead. not a good day. atleast i got a can of mix. so they will run on diesel but not for very long.

dare i say, but maybe there was more diesel, but all 4 that blew up were stihls and not one husky had a problem. not proven but would make sense.

9th April 2008, 12:18 PM	#2
JohN Dee Moderator - Sponsor Join Date: Feb 2007 Location: Sydney, Australia Posts: 929	Re: Diesel chainsaw?????? YES or No????? Thanks for sharing Caporal. Very interesting, besides the fact that if they did market it, I'd have to start bloody carrying an extra container of Diesel :P It is very hard to imagine someone like Stihl, making something as compact as a 200T, a diesel engine. Although I could imagine something like an 880 or a 3120 as a diesel... __________________ The bigger the dreams, the smaller the competition Red : Green : Blue

9th April 2008, 01:31 PM	#3
newguy18 Part of the Furniture Join Date: Jun 2007 Location: orlando,fl Posts: 5,184	Re: Diesel chainsaw?????? YES or No????? Thanks for sharing,do you think its safe to use around power? __________________ Have your say join us today. I ship USA saws out of the USA old schooler

9th April 2008, 03:23 PM	#4
ScottWojo Custom Chainsaw Muffler Modifications Join Date: Dec 2007 Location: Ohio Posts: 104	Re: Diesel chainsaw?????? YES or No????? I cant remember where I read it but any saw will run on Diesel if you get it hot first and you adjust the squish properly. Scott. __________________ ScottWojo HP Modified Chainsaw Mufflers\| GB Bar and Chain Distributor.

9th April 2008, 11:17 PM	#5
CAPORAL30 Sappling Join Date: Dec 2007 Location: CANADA Posts: 48	Re: Diesel chainsaw?????? YES or No????? This is an interresting question?????????????????????? I would like to see that being a miracle..................a nice theory but impossible to my knowledge since diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously. A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. it is not feasable with the engineering design of the chainsaw. I have seen some diesel engines that would run on gas for startup....with a decomp valve and then when hot enough ...would turn to diesel operation but never the opposite(CR is too low). on standard chainsaw...better have a strong rod..... Alain, /www.csgnetwork.com/compcalc.html

15th April 2008, 11:36 PM	#6
SawTroll Semi-mature vigorous tree Join Date: Nov 2007 Location: Troms, North Norway Posts: 144	Re: Diesel chainsaw?????? YES or No????? Here is the story of the Diesel Chain Saws, written by no less than George Blake. Since he wrote that, there has been documented that some Comet "A"s were made in Sweden, and some Comet "B"s in Norway - but most of the parts probably were made by Jonsereds anyway......

23rd April 2008, 02:23 PM	#7
olyman Semi-mature vigorous tree Join Date: Dec 2007 Location: iowa--usa Posts: 102	Re: Diesel chainsaw?????? YES or No????? caporal---and how did you find out about, and purchase, this rare gem????

24th April 2008, 04:02 PM	#9
Therrin Tree World Ninja Monkey Join Date: Oct 2007 Location: Bakersfield, Ca Posts: 2,554	Re: Diesel chainsaw?????? YES or No????? is that a fancy way of saying "a garage sale"?? Incidentally, I was over at a guy's place this evening returning his socket set. (a WW2 set that runs up to 4") He's also a tractor mechanic and he's been helping my friend and I as we've been rebuilding the hydraulic swivel motor on the excavator. Anyhow... we got to talking about saws and he showed me his old Stihl 041, and as I was ogling it with my eyes, he brought out his 1940's homelite... that thing weighed a ton!!! What a bitchin saw though. I'll have to ask him about the diesel saw thing.

21st May 2008, 10:13 AM	#11
JayD Moderator - Sponsor Join Date: Feb 2007 Location: Sydney Posts: 1,433	Re: Diesel chainsaw?????? YES or No????? --- __________________ Level 4 Arborist Last edited by JohN Dee; 21st May 2008 at 10:15 AM. Reason: Dads bloody account again

21st May 2008, 10:15 AM	#12
JohN Dee Moderator - Sponsor Join Date: Feb 2007 Location: Sydney, Australia Posts: 929	Re: Diesel chainsaw?????? YES or No????? Hey Cap, how do you go when your saw runs out of diesel? Do you have to prime it up like a mofo for it to start again? __________________ The bigger the dreams, the smaller the competition Red : Green : Blue

21st May 2008, 10:37 AM	#13
CAPORAL30 Sappling Join Date: Dec 2007 Location: CANADA Posts: 48	Re: Diesel chainsaw?????? YES or No????? Diesel is combustible when mixed wit hot air....since the engine is already hot the air mixture with the diesel at he injector permits to spin the flywhell by hand and it should start the engine ...but i have never tried it... ...OR SIMPLY USE THE CRANK...... Alain, Last edited by CAPORAL30; 21st May 2008 at 10:38 AM. Reason: typo

9th June 2008, 03:33 AM	#14
jokers Sappling Join Date: Jun 2008 Location: New York, USA Posts: 25	Re: Diesel chainsaw?????? YES or No????? Jonsered produced two variants of the diesel chainsaw, one used a small propane heater and another used a battery powered glow plug arrangement.

9th June 2008, 06:22 AM	#16
jokers Sappling Join Date: Jun 2008 Location: New York, USA Posts: 25	Re: Diesel chainsaw?????? YES or No????? Hi Alain, I did not intend to say Jonsered was first, I was simply replying to the question of how the combustion air is heated on a cold saw and referred to Jonsered`s two methods.

9th June 2008, 08:36 AM	#17
CAPORAL30 Sappling Join Date: Dec 2007 Location: CANADA Posts: 48	Re: Diesel chainsaw?????? YES or No????? jokers....you are right...

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