CMB 35RS

[RickTomsett]

has any one seen one or know any thing about one, rpm, hp, ARE THEY ANY GOOG FOR THAT MUCH MONEY

CMB 35RS GAS ENGINE

 

[Harald1966]

has any one seen one or know any thing about one, rpm, hp, ARE THEY ANY GOOG FOR THAT MUCH MONEY

CMB 35RS GAS ENGINE

I have seen one.

They are worth the money if you buy the latest version with piston ring, not ABC.

-"Many R/C Engines come in both ABC and Ringed versions. The ABC type engine has an Aluminum piston, a Bronze cylinder sleeve, and Chrome plating on the cylinder sleeve or a variation where Nickel plating is substituted for the Chrome plating. These engines have a tapered cylinder which changes to a non-taper when at operating temperature.

The other type of engine is the ringed engine. This engine has a piston ring. The cylinder is not tapered. It is the ring which prevents gas from passing by the piston (blow-by). The ring has spring tension which forces it against the cylinder wall at all times. This is why it is not necessary to taper the cylinder walls during construction. There is one other important difference. The cylinder walls are not plated bronze. Instead, they are constructed of a porous metal. This means that it has many tiny holes in the metal structure. During engine operation, carbon from the burnt gases will begin to fill these holes on the surface of the cylinder. This carbon makes an excellent lubricant. The piston ring is not porous.

What does this mean to the user? The ABC type engines can typically withstand more heat before they are damaged. More horse power is available from these engines if the fuel mixture and prop sizes are changed to push the engine harder. However, because the cylinder walls are tapered at low temperatures, they can be harder to start.

The ringed engines start easily since the ring prevents blow-by even when the engine is cold. However, all of the friction in a ringed engine takes place at the ring itself, a relatively small area. Also the porous cylinder material does not dissipate heat as fast as the bronze cylinder in the ABC type engine. This means that the engine is more easily damaged by too much heat.

Because of these characteristics, you can expect that the safe operating temperature range of the ringed engine to be shifted lower than the ABC type engine. This means that the ringed engine will require good lubrication at high r.p.m. Since castor oil has a much higher flash-point than synthetic oil, your fuel should contain at least some castor oil. You should also avoid running your engine too lean."

 

[Harald1966]

BTW,who is selling in US and what is the price?

Link please.

 

[RickTomsett]

BTW,who is selling in US and what is the price?

Link please.

I saw it on e-bay but you want to sit down before you read the price lol

 

[steve wood]

BTW,who is selling in US and what is the price?

Link please.

i am a dealer. they sell for $1600.

 

[BB Mods's]

Stu Might have a good deal for someone wanting one though.

 

[RaceMechaniX]

Stu has two of them in stock last time I talked to him. Give him a call if you are interested.

I have one in a BIG rigger. after some problems were sorted it has been reasonably reliable. Mine has been modified (it really didn't need it however) and probably is between 9-10hp running at 19,500 RPM on VP U2.

Tyler

 

[BB Mods's]

Tyler, I might have to take that BIG rigger from you some day...

 

[RaceMechaniX]

Tommy,

Perhaps after I reset the two-lap record to something more reasonable I would be willing to accept offers.................

Tyler

 

[BB Mods's]

We have time, iv got a pipe profile that should work well for that engine, I still plan to work on it this winter.

 

[RaceMechaniX]

Sounds good.

 

[Harald1966]

BTW,who is selling in US and what is the price?

Link please.

i am a dealer. they sell for $1600.

That's not too bad!

Back home they were $2700 last time I checked! That included a spark plug though.

 

[lohring]

Our development of the CMB 35 is posted in an article at www.modelgasboats.com With fairly minor modifications it is capable of nearly 12 hp. We used a 10+ hp, high rpm version to set the GX2 record at 103 mph.

Lohring Miller