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Author Topic:   Rotary Engines
hardensheetmetal posted 09-14-2002 12:30 PM ET (US)   Profile for hardensheetmetal   Send Email to hardensheetmetal  
I just read an interesting article about a local marine engine distributor (Mack Boring) starting to sell marinized Mazda rotary motors. I think they were I/Os. I was wondering if they might be adaptable to an Outboard configuration. I believe that Bombardier makes rotary snow mobile engines.


kglinz posted 09-14-2002 01:56 PM ET (US)     Profile for kglinz  Send Email to kglinz     
OMC did a lot of playing with Wankels back in the late 60s . That would have been before Mazda came up with good rotor seals. Could be a great engine.Would cost a fortune to develop it for use other than competion.
Dick posted 09-14-2002 09:10 PM ET (US)     Profile for Dick  Send Email to Dick     
The engines that Bombardier uses in their Sea Doos and Ski Doos are made by their Rotax division and are conventional piston engines in both 2 and 4 stroke.
DIVE 1 posted 09-14-2002 09:25 PM ET (US)     Profile for DIVE 1    
As Dick stated, Bombardier Rotax engines have pistons, but some are equipped with rotary valves instead of reed valves. But they are still conventional engines.
tabasco posted 09-14-2002 09:45 PM ET (US)     Profile for tabasco  Send Email to tabasco     
As I remember...could be wrong..... but the negative of the rotary was their fuel consumption
Dick posted 09-14-2002 11:06 PM ET (US)     Profile for Dick  Send Email to Dick     

I could be wrong since I haven't worked at a Sea Doo/Ski Doo dealer for a few years but I think all of the Rotax engines have rotary valves. Can't remember ever stocking reed valves in the parts department.

EddieS posted 09-15-2002 01:41 AM ET (US)     Profile for EddieS  Send Email to EddieS     

You are correct. Mazda ran the rotary in some of the early trucks, the 2 and 4 and finally in the RX7. My wife had an early 80's RX7 which I replaced the motor in. It was a fun car to drive but got terrible gas mileage! The amazing thing about the rotary is the amount of power that can be achieved with a very small block. The RX7 had an 1100 cc rotary in it. The motor ran smoothly and loved the high RPM's, it was very smooth at close to 7000 rpm's. Also a very simple motor, problem with it was that it had a four barrell carb and when you got into the secondary's it really sucked the fuel down. I think that we averaged somewhere around 20 Mpg with that thing.


DIVE 1 posted 09-15-2002 06:34 AM ET (US)     Profile for DIVE 1    
Most of the Ski Doo engines now have reed valves. This change started a couple of years ago. They do not seem as fast as the rotary valve engines they replaced.
Dick posted 09-15-2002 12:55 PM ET (US)     Profile for Dick  Send Email to Dick     

Progress??? Why change a winer.


DIVE 1 posted 09-15-2002 07:03 PM ET (US)     Profile for DIVE 1    
Since the government has the auto industry inline with reduced emissions, it is time to look at everything else. Boats, motorcycles, snowmobiles, ATVs, PWCs, etc. are all going to be subject to emission standards. Look at all the money that is poured into the new 2&4 cycle outboard research and technology.
Honda has always built 4 cycle outboards but now they are going to market with 2 new 4 cycle PWCs. One even has a turbocharger, maybe this is one wave of the future. I think the Rotax engine is being changed to reed valves as a stepping stone to meet the emission standards coming up down the road.
Dick posted 09-15-2002 08:35 PM ET (US)     Profile for Dick  Send Email to Dick     

You are probably right on the emission standards being the cause for changes and I don't have a problem with that.

Bombardier has built a Rotax 4 stroke for several years for ultra lights and introduced it into Sea Doos this year. Could be it will be a JohnRude powerhead soon.

Saw an article recently comparing the Honda 4 stroke PWCs to the Sea Doo. Don't remember the details but I think the Sea Doo came out ahead.

I can't knock progress or I would be running a 2 stroke rather than a 4 stroke.

DIVE 1 posted 09-15-2002 08:52 PM ET (US)     Profile for DIVE 1    
I think we will see a lot of changes with JohnRude in the next couple of years. Bombardier has extensive assets and technology that is passed from one division to another. This sure gives them an edge on research & development of new products and technologies.
pequotman posted 09-16-2002 11:38 AM ET (US)     Profile for pequotman  Send Email to pequotman     
check out his site for a little more info on Rotary power.

hauptjm posted 09-17-2002 03:41 PM ET (US)     Profile for hauptjm    
As I remember, the rotarys were real oil burners as well.

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