sachs dolmar rotary engine

[redpowerd]

anyone know much about these saws?
sachs the only one to produce a wankle saw?
seems interesting

[SasquatchMan]

Red I don't know anything about these saws, but I too am excited about the thought of a rotart engine saw... pretty neat.  Wankel is such an under-utilized technology... I wonder why?  The old Mazda RX7 with rotary sure had a lot of juice.

[oldsaw-addict]

The Sachs Dolmar saw you're thinking of was the KMS4 model. I'm trying to find one for my collection but not having much luck. IT would be great if there were more chainsaws with rotary engines in them, just imagine a Stihl 088 with a rotary in it. I can only imagine the power ratings for it, probably at 121cc displacement, it would have about 25HP or more. ULTIMATE mill saw! I'll call tim allen and pray he can hold back from going nuts with it!

[redpowerd]

theres one for sale at the chain saw collectors corner website. let me know how it cuts ;)

[Minnesota_boy]

When Wankel engines first came out they had a bunch of trouble with the seals in the chamber and with the chamber surfaces wearing into a washboard.  The engine life was too short and it turned a lot of people off.  Hopefully those problems are solved by now.

[oldsaw-addict]

I think that may have been because the first ones to be released to the public had been released with little R&D going into them. Now we have the chrome plated bore that lasts longer and we have better materials that work better cause less wear and tear, take more wear before needing replacement or repair, and just plain cost less. My my my just look at how far we've come in 40 years, we've gone from low power gear drive with scratcher chain to direct drive with chisel chain that cuts better faster and is easier to sharpen. If we evolved this fast I'd be a super human by now and humanity would be much wiser and better than it is. No offense intended toward humanity in general.

[Minnesota_boy]

One of the other things that kept Wankel engines from widespread use was the emissions.  The surfaces in the combustion chamber (I know that's the wrong term, but it's the best I can do) were larger which kept it from getting as hot and burning as clean.  Anyone know how this has been overcome?

[Duane_Moore]

 :P Well should I our not? was a teck for Mazda Mt. of America. the Winkle engine died because of poor fuel economy,& the coming of smaller catalitic converters. the winkle is a dirty emision engine. but could be cleaned up real easy, the emisions were turned to steam. the Side seals were early problems with the engine. the Apex seal on the rotor tips lasted good. but would chip easely. the engine was used on Scorpion snowmobils in the 1968 to 70 years. then Mazda RX2 to RX4, the engine was limited to rpm by the stationary gear. to hot rod one of these we would case harden the gear and it would wind up big time, the best fuel milage we could get was about 14mpg in the 70s this killed the winkle. I have many teck manuals if anybody would like to go futher, let me know. Duh---Duane

[oldsaw-addict]

I'll take 2 of those tech manuals you have.

[Duane_Moore]

 8)anybody else, e-mail me an address will copy them off. Duh---Duane   (one copy, you copy the second one my printers tired) me to  32 pages

[redpowerd]

ive got a old scorpion, think its a 400 stinger, wankle? or no wankle?

[Minnesota_boy]

Gee, after all the negatives I posted about the wankel, now it's time for a positive.  THEY WERE SMOOOOTH.  In a snowmobile, you could lay a quarter on top the engine, start it up and the quarter wouldn't even move.  No vibration at all.  Should be a really good quality in a chain saw.  8)

[Duane_Moore]

 :P :PRedpower, ya diggin at my memory. the stinger 400 was a Sacks twin cyl piston engine, I think should be red in color. the wankle was a smaller sled. black in color, and its piston verson had a single sacks, 18 hp , now this is from memory only guys, the wankle had no pistons, only a single rotor, quiet, smooth, fast, used lots of fuel, got ya all oily on the front, were very dirty motors. to tune up a rotory motor you would put water in the carb with a hose while running full throtle, this would take the carbon off the Apex seals, and clean the insides up, I think I have an old pict of a scorpion somewhere, Thanks guys, Duh---Duane

[redpowerd]

i know theres somekinda canadian symbol on the recoill side
sachs built both motors?
i only had it running for a few days. real fast for a little sled with bogie wheels. kinda dangerous, didnt turn real well or react with body manuvers.
sucked for the woods, all top end :-/ ;)

[Duane_Moore]

 ???oldsaw-addict   did you recive the manuals yet? Duane

[oldsaw-addict]

Yep, Thanks Duane. I'm gonna have to find me a KMS 4 to play with and see what I can do with it.

[Mark M]

Speaking of them rotary engines, I was thinking of making me a turbo powered chainsaw. Figured I'd get an old turbocharger off a D9G Cat and weld a sprocket to the cold wheel then hook it up to the exhaust on my shop-vac. I could cut firewood and vacuum up the sawdust at the same time. :D :D :D

We had a 1967 Scorpion snowmobile with a 15hp Sachs engine. That thing was so hard starting and such a pain in the butt that I still cringe whenever I hear the word Sachs!

[Duane_Moore]

 :D :D :DGot ya stinky. we also had the old Scorpions. real narrow. fell off a lot, got stuck bunches. turn corner fall off . upset cart. laugh go again. noisey, dirty, hard starting, but they were FUN. we were young then. that was 40 yrs ago. good memories.  thanks Duh---Duane. ;D ;D ;D. ps. have often thought about a supper charged saw. the Detroit 2 cycle were supper charged. have thought about an air pack for a saw, like a small heater motor. Oh. Duh.

[Mark M]

Yep - 45 miles an hour if you ducked down behind the windshield :D