SACHS DOLMAR

[rede2fly]

HEY GAS TECHS!!!!!!! are all sachs dolmar the same motors? are they sold under other company names ?? and how can you tell if in fact it is a real sachs?? what should it say on the motor??

[SleepyC]

I know a lot of the conversion motor companies use SACHs cylinders.
But thats about all I know.

[3ddd]

if the crank is real soft and you can almost bend it with your hands,you have a real sach-dolmar engine

[WangoTango]

Soft crank?
Must have been a Polan or Riobi something-or-other from Walmart!
Most identifiable marks on a Sachs Dolmar? Some used Mahle and some used Aveen cylinders. On top of the cylinder head was a stamp that read A through D plus a couple of smaller numbers. The "A" was the best fit while the "D" meant industrial fit. (Tolerances of piston/cylinder fit.) As far as soft cranks, Sachs Dolmars didn't have a great reputation for contacting the ground at a high rate of speed and surviving due to the large flywheels and the overall weight of the engine. They were, however, the powerhouse of the day. That business of high speed? Well, let's just say that they were the hot motor when compared to Zenoahs and Quadras.
When Sachs Dolmar started to decline, we saw ads for just plain "Dolmar" motors. These motors were characterized by a thinner flywheel and a different cylinder head look. (Sorta similar to the DA-100 heads) Not a lot of these made it to the modeling world. Some of the earlier Sachs Dolmar manufacturers included A&M, Yeager Machining, TG, Walker Machining and Air Hobbies. Might be some more but can't think of all of them. Air Hobbies still uses Sachs parts in manufacturing their singles and twins with their distinctive motor mount/muffler arrangement. I still have a 4.2 Yeager
Sachs, a 3.7 Yeager Sachs,(Both have the smooth flywheel with the ignition system behind the flywheel) a 3.1 Yeager magneto with exposed coil and a 3.7 A&M short stroke on C&H ignition. The Zenoah line represented what I like to call the "K&B motors of the gas world." (Good running, dependable, good power.) The same goes for Quadra. The Sachs Dolmar was the step up from K&B to Cadillac. Now we are going through the "Lamborghini stage of model power" with the DA's and 3W's.
Just watch....... Some guy is gonna think of a way to fit 4 purple colored electric motors to a gearbox and drag a 40% bird around like no tomorrow! (HUH? They already do that!!??)
AHHHHHH!!!!! The future is here!!
WT

[youngflyer]

my brison 3.2 is almost identical to a sachs dolmar motor

[rede2fly]

thanks wango. i just got this motor . the guys said it is a sachs dolmar. it also has a ch ignition. i took the muffler off and it looks great inside. it has 2 rings as well. the motor complete with ign weighs 4.57 lbs. this motor has some serious compression. and i checked the spark. it is very good nice blue heavy spark. the only numbers i can see is on the front of the motor. they are 44zn18. here are a couple of pics. maby you can tell me if its worth using or not. oh yea on the top of the cylinder the stamp is C.. i know if i get a different muffler and different mount i would loose a pound for shure oh yea its a 3.2

[WangoTango]

Redi,
Slap that puppy on a 50cc bird and go play! Something in a 20-10 prop ought to give you all the pull you need to play hard...... The muffler is a Bennett and is going to be somewhat loud. (depends also on your prop choice) The aluminum plate mount has some flush mounted (4) allen head screws to lock it onto the crankcase. (It's lighter than you think!) It also has the throttle couple advance that retards the timing for starting. Don't jack with the linkage on the front..... It's probably set for something in the 28 degree BTDC range. If you change it the odds are it will knock your hand off if you hand start it or if you go the other way it will probably not run at all. If you pull off the cylinder assembly and find that there is a lot of carbon build up in the head, take the whole cylinder assembly (less the carb and muffler) to NAPA or somewhere that offers glass bead blasting and have the inside AND outside of the assembly completely blasted (The glass bead material has the consistency of baby powder) so that it looks like new. The outside WILL look new and the inside will have all the carbon build-up removed. Less carbon equals less chance for detonation and will make it run like new again. Make sure the gaskets in the carb are good and the little 1/4" diameter screen is clear and clean. Run it on 50:1 or 100:1 Echo, Stihl or Amsoil mix and you can't go wrong. Stick with 87 low lead gas..... Don't bother with anything hotter in the octane department. If you can find one of Dario Brishagella's US Quadra pitts style mufflers with the adjustable angle stacks, it might pick ups a few RPM's and be a tad quieter. It ain't exactly a DA or a 3-DUB but you'll get years of service if you take a little time to clean one up. Hope this helps.
WT

[LawnJockey]

WT,
You must be a Nugent Fan . I have a Brison 5.8 that hasen't been broke in yet. I am planning on running this on a CH/PP/CA Extra 300 34%. Is there a problem with this motor shaking too bad being a single cylinder rather than a double?

Bruce

[LawnJockey]

Here are a couple pics.

[Tired Old Man]

Wango Tango,

Good job with the Sachs info!!

If it's a stock Sachs head, the Bisson and J&A mufflers for the Brison and Taurus line will also fit that engine. Sachs-Dolmar are good engines that last forever if somewhat cared for. The difference between them and the current crop of expensive stuff is primarily in recasting a few parts to shave off some weight, along with some port modifications.

The owner of this one might want to send that ignition in for a check up. I can't tell for sure but it looks like the ground strap is broken in one of the photos. That's a very inportant part of this ignition system!

[rede2fly]

once again thanks wango for the information. its nice to get good info. the dude said it just came back from ralph cunningham(who ever he is) for its check up and was giving a clean bill of health. it looks good to me. i dont know how old it is, but it looks like its been taken care of.very clean inside and from what i could see there isnt any carbon buildup at least looking in from the exhaust port and the spark plug hole. although i didnt boreascope it. and for the 50cc bird i will be looking for one at the nall

[WangoTango]

Ted Nugent? Yep...... From my young and crazy days! As for what Silver Surfer said: Check that ignition ground and make SURE there is an "R" series plug in your motor. Also look on Aircraft International's site on how to balance a prop and you'll be surprised at how a "shaker" Sachs will smooth out. Ralph Cunningham? If it has to do with timing and ignition, Ralph is your guru you want to talk to. I'm 55 and I'm still learning something everyday after 46 years of playing with model airplanes. I don't profess to know it all but I always strive to! Let me know how it turns out.
WT