Custom/Hybrid Why not a rotary engine?

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
A stock 701 is advertised to make 73 HP. With exhaust, it may weigh 90lbs. That's 0.81 HP/lb
A ported, piped 701 platform motor can be made to perform well over 1 HP/lb.
Stroked big bores can probably get close to 2 HP/lb
 

OCD Solutions

Original, Clean and Dependable Solutions
Location
Rentz, GA
Yes, but can they pass EPA emissions regulations in the years to come?

From a personal installation standpoint i don't think it would make sense to install one but from a production ski point of view it is probably the best alternative.

P.S. You guys are way off on your cost and power to weight ratios. Production costs/specs on certain rotary marine powerplants are very reasonable and on par with current 2 strokes....and thats all i am allowed to say about it. :sneaky:
 
Location
NW PA
P.S. You guys are way off on your cost and power to weight ratios. Production costs/specs on certain rotary marine powerplants are very reasonable and on par with current 2 strokes....and thats all i am allowed to say about it. :sneaky:

what are you implying OCD Solutions? PS I'm a soon to graduate mechanical engineering student looking for a job.....
 

OCD Solutions

Original, Clean and Dependable Solutions
Location
Rentz, GA
Lol, no jobs here, just sharing some tidbits uncovered during some product research and networking.
 
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Boris

The Good Old Days
Yes, but can they pass EPA emissions regulations in the years to come?


The Wenkel isn't exactly an EPA darling either. Even the Renesis has some issues and is choked down quite a bit.
I remember some heavily ported race motors that would dump so much fuel out the exhaust at idle that you could run a 4 cylinder on the fumes alone. Still love the sound of a peripheral ported twin rotor at full song. Hell, just having one idle was enough to get a decent crowd to gather.
 
Location
NW PA
While you guys have been bickering about what to call these engines, I heard back from Aixro about their engines. They agree their current engine does not meet our power class but a dual rotor version will and are currently working on broadening their engine to fit different applications, including jet skiis.
 

OCD Solutions

Original, Clean and Dependable Solutions
Location
Rentz, GA
For fear of saying more than I am at liberty to say, I am out of this conversation. :biggrin:

Lets just say there are some new designs in rotary technology that place rotary engines very high on the list for feasable replacements to 2-stroke and 4 strokes for the standup world and leave it at that. mmmkay?
 

Boris

The Good Old Days
For fear of saying more than I am at liberty to say, I am out of this conversation. :biggrin:

Lets just say there are some new designs in rotary technology that place rotary engines very high on the list for feasable replacements to 2-stroke and 4 strokes for the standup world and leave it at that. mmmkay?


I hope you are right as the rotarys linear power delivery is sooo addictive.
I know there's a lot more out there but none has made it to mass production as yet which is a great shame. Pistons are so overrated and the whole 4 stroke wastefulness is sooo yesteryear.
 
Location
NW PA
For fear of saying more than I am at liberty to say, I am out of this conversation. :biggrin:

Lets just say there are some new designs in rotary technology that place rotary engines very high on the list for feasable replacements to 2-stroke and 4 strokes for the standup world and leave it at that. mmmkay?

ETA? oh that's right, you left this convo.
 

munki63

Epoxy is my duct tape
Location
Canada
Anybody ever flooded there 2-stroke? Pretty easy to fix that... Now! Ever flooded a rotary... I have...NOT fun involves pulling the plugs, I love the rotary but it just wouldn't work... Not a chance
 

Boris

The Good Old Days
Anybody ever flooded there 2-stroke? Pretty easy to fix that... Now! Ever flooded a rotary... I have...NOT fun involves pulling the plugs, I love the rotary but it just wouldn't work... Not a chance



So which part is the "not fun" ?
2 plugs on a 701 versus 4 on a 13B, doesn't sound that bad to me.
No rods to bend and if it's normally aspirated, clearing it out should be a snap.
 

munki63

Epoxy is my duct tape
Location
Canada
So which part is the "not fun" ?
2 plugs on a 701 versus 4 on a 13B, doesn't sound that bad to me.
No rods to bend and if it's normally aspirated, clearing it out should be a snap.
You dont always have to pull the plugs on a two stroke.... you do in a rotary, personally I love the rotary i would put it in everything! even my lawn mower! lol but for what we put two strokes thru it just wouldnt work... not a chance, and i really dont think they would do too well taking a gulp of water.
 

Boris

The Good Old Days
This could make for one fun experiment.
Take a 701 at full song and dump a glass of water down the carb and do the same with a rotary.
Hmmm,.............



I know where there's a twin distributor 12A collecting dust.
 

munki63

Epoxy is my duct tape
Location
Canada
This could make for one fun experiment.
Take a 701 at full song and dump a glass of water down the carb and do the same with a rotary.
Hmmm,.............
I know where there's a twin distributor 12A collecting dust.
lol! i like the way you think! this stupid thread just bought me an rx7 i think...find out tomorrow ( i was just looking for a wrecked 13b...ive got a blaster hull...and i really hate the 61x in it....)
 
Location
NW PA
lol! i like the way you think! this stupid thread just bought me an rx7 i think...find out tomorrow ( i was just looking for a wrecked 13b...ive got a blaster hull...and i really hate the 61x in it....)

you're welcome, can I get a ride in it?
 
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