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03-19-2022, 02:16 PM #4666000 RPM
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In this day of electrification, I don't see anyone investing the capital required to produce a rotary economically. The world has been machining round holes and cylinders for 120 years and have become quite proficient at it. Mazda held on as long as they could, until emission abatement cost more than a competitive 4-stroke.
With today's materials, durability is not an issue. The rotary's weakness is its surface to volume ratio, resulting in significant flame quench, causing high hydro carbons and reduced fuel efficiency.
I believe if OMC would have continued the rotary in specific application, they may still be in business. I believe the rotary would have been competitive over the complexity, size and cost of the Ficht and their latest air injection system.
Imagine a 250HP twin rotary IO w/o a dog house. or a side wider 4 rotor 500HP IO also w/o a dog house. Both with 1/2 the weight of a comparable 4-stroke.
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03-19-2022, 04:57 PM #467
Soooooooooo, does it fire every time a rotor lobe passes through a chamber??
As in, 3 lobes so it fires 3 times per rotor revolution?I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
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03-19-2022, 07:03 PM #4686000 RPM
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Yes, however , the crank has made 3 revolutions for that to happen. Its's like a 2-stroke that way. If the crank revolves 3 times, the spark plug fires 3 times Thus by your way of thinking a 2-stroke should be measured X 3. The simplest way to measure displacement for ANY engine is to measure the displaced volume per each crankshaft revolution.
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Instigator thanked for this postLake X Kid liked this post
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03-19-2022, 07:51 PM #469
No argument from me.
I am just trying to wrap my head around, how it does what it does.
Not throwing stones.
I spent 3 days trying to make sense of the illustrations posted
I thought I understood rotaries.
Clearly I did not.
I guess the argument could be, swept volume Vs crankshaft rotation?
I like it.
Is the rotary design being used anywhere besides the bike project I posted?
I caught your comments on emissions and the bike guys are using a total loss oil system and stated that it burns so clean it doesn’t show up in the exhaust.
I still have the ‘1973 Mechanix Illustrated issue on the OMC motor and remember what caught me the most was the engineering that allowed them to stack them up and make what ever power they wanted.
Always thought was brilliant and should be a game changer.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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03-20-2022, 03:55 AM #4706000 RPM
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There are a couple of company's in England making rotaries for drones and military activities. Mazda claims they will make a rotary range extender for their hybrid cars. Moller in California has put rotaries in all sorts of things and continues to look for investors to bring the engine to mass production. I have done consulting work for several company's building gen sets for the military, but none to my knowledge have gone into production.
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03-20-2022, 04:42 AM #471
Yrs back, I tried to find a twin turbo RX-7, but failed.
Cant remember if it was that or the 8 where they got sued over inflated HP claims.
Claimed 280 but was closer to 250/260???
Id still like to have a twin turbo 7.
We have a shop, still in Cols that has specialized in Mazda rotaries from day 1.
Just passed it the other day and they had 20+ cars sitting in front.
BTW, re-read the first 14 pages of this thread last night!
13 yrs later, it still entrtains!
Sad part is Liquid Nirvanas absence.
I spoke w/him on the phone several times back in that era.
Sent him some OMC racing posters.
I remember he was devastated when the photo hosting service he was using,locked/erased all his, hundreds of photos and yrs of work.
I remember him telling me he was just doing it for the love of the brand.I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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03-20-2022, 10:04 AM #4727000 RPM
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Horse power being defined as "work over time " the rotary's long combustion pressure events seems to be it's big advantage. It also doesn't have the negative inertia problem of a reciprocating engine.
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03-20-2022, 10:47 AM #4736000 RPM
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03-20-2022, 04:22 PM #474I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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03-21-2022, 01:04 PM #4758000 RPM
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03-21-2022, 06:32 PM #4766000 RPM
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We all know a curved line between 2 points is longer than a straight line. Your concept just increased surface area for flame quench. The out side shape of the rotor is a mathematical shape based on the mathematical shape of the trochoid. go back to my you tube model and watch the rotor go around.
Last edited by Rotary John; 03-22-2022 at 06:45 AM.
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04-19-2022, 07:13 AM #477
NEW - Titanium Rotary Engine Key-chain Spinning Rotor Stimulates Motor |
On SALE
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07-18-2022, 09:23 PM #4785000 RPM
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02-11-2023, 05:21 PM #4798000 RPM
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02-11-2023, 09:32 PM #480Screaming And Flying!
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How high can a rotarys compression ratio be?