User Tag List

Page 32 of 34 FirstFirst ... 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 LastLast
Results 466 to 480 of 500
  1. #466
    Join Date
    Jun 2009
    Location
    Georgia
    Posts
    1,006
    Thanks (Given)
    2
    Thanks (Received)
    232
    Likes (Given)
    9
    Likes (Received)
    364
    Mentioned
    39 Post(s)
    Tagged
    0 Thread(s)
    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.

  2. #467
    Join Date
    Apr 2001
    Location
    Cardington Ohio
    Posts
    19,661
    Mentioned
    7 Post(s)
    Tagged
    1 Thread(s)
    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
    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

  3. #468
    Join Date
    Jun 2009
    Location
    Georgia
    Posts
    1,006
    Thanks (Given)
    2
    Thanks (Received)
    232
    Likes (Given)
    9
    Likes (Received)
    364
    Mentioned
    39 Post(s)
    Tagged
    0 Thread(s)
    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.

  4. Thanks Instigator thanked for this post
    Likes Lake X Kid liked this post
  5. #469
    Join Date
    Apr 2001
    Location
    Cardington Ohio
    Posts
    19,661
    Mentioned
    7 Post(s)
    Tagged
    1 Thread(s)
    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.


    Quote Originally Posted by Rotary John View Post
    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.
    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

  6. #470
    Join Date
    Jun 2009
    Location
    Georgia
    Posts
    1,006
    Thanks (Given)
    2
    Thanks (Received)
    232
    Likes (Given)
    9
    Likes (Received)
    364
    Mentioned
    39 Post(s)
    Tagged
    0 Thread(s)
    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.

  7. #471
    Join Date
    Apr 2001
    Location
    Cardington Ohio
    Posts
    19,661
    Mentioned
    7 Post(s)
    Tagged
    1 Thread(s)
    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

  8. #472
    Join Date
    Dec 2002
    Location
    South Florida
    Posts
    2,296
    Thanks (Given)
    0
    Thanks (Received)
    154
    Likes (Given)
    1
    Likes (Received)
    541
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    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.

  9. Likes Instigator liked this post
  10. #473
    Join Date
    Jun 2009
    Location
    Georgia
    Posts
    1,006
    Thanks (Given)
    2
    Thanks (Received)
    232
    Likes (Given)
    9
    Likes (Received)
    364
    Mentioned
    39 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Instigator View Post
    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.
    here ya go.
    Used Mazda RX-7 Turbo for Sale: 7 Cars from $26,500 - iSeeCars.com

  11. #474
    Join Date
    Apr 2001
    Location
    Cardington Ohio
    Posts
    19,661
    Mentioned
    7 Post(s)
    Tagged
    1 Thread(s)
    When I was looking at them, they were $10K cars!

    I currently have a 600HP ‘2002 Trans Am and a 87hp MGB.

    Some day I’ll own an RX-7, but not today.




    Quote Originally Posted by Rotary John View Post
    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

  12. #475
    Join Date
    Oct 2011
    Location
    Southern California
    Posts
    3,514
    Thanks (Given)
    177
    Thanks (Received)
    449
    Likes (Given)
    3381
    Likes (Received)
    2278
    Mentioned
    29 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Rotary John View Post
    ... The rotary's weakness is its surface to volume ratio, resulting in significant flame quench, causing high hydro carbons and reduced fuel efficiency.

    Would redesigning the Rotor's surface change the flame quench problem.

    Like a concave rotor (see my poor illustration attempt to draw on the computer).

    Click image for larger version. 

Name:	Concave Rotor.jpg 
Views:	180 
Size:	163.7 KB 
ID:	502597

  13. Likes Instigator liked this post
  14. #476
    Join Date
    Jun 2009
    Location
    Georgia
    Posts
    1,006
    Thanks (Given)
    2
    Thanks (Received)
    232
    Likes (Given)
    9
    Likes (Received)
    364
    Mentioned
    39 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Lake X Kid View Post
    Would redesigning the Rotor's surface change the flame quench problem.

    Like a concave rotor (see my poor illustration attempt to draw on the computer).



    Click image for larger version. 

Name:	Concave Rotor.jpg 
Views:	180 
Size:	163.7 KB 
ID:	502597
    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.

  15. #477
    Join Date
    Feb 2008
    Location
    Lake of the Ozarks and Stuart, Florida
    Posts
    9,298
    Thanks (Given)
    1557
    Thanks (Received)
    1033
    Likes (Given)
    1534
    Likes (Received)
    5492
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    NEW - Titanium Rotary Engine Key-chain Spinning Rotor Stimulates Motor |
    On SALE

    Attached Thumbnails Attached Thumbnails rotary.jpg  

  16. Likes FMP, Baker343 liked this post
  17. #478
    Join Date
    May 2006
    Posts
    400
    Thanks (Given)
    0
    Thanks (Received)
    3
    Likes (Given)
    3
    Likes (Received)
    17
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by lars strom View Post
    NEW - Titanium Rotary Engine Key-chain Spinning Rotor Stimulates Motor |
    On SALE

    I bought one too.

  18. #479
    Join Date
    Oct 2011
    Location
    Southern California
    Posts
    3,514
    Thanks (Given)
    177
    Thanks (Received)
    449
    Likes (Given)
    3381
    Likes (Received)
    2278
    Mentioned
    29 Post(s)
    Tagged
    0 Thread(s)
    I think my formulaic parameter puts the 2 Cycle's performance greater, than the 4 Stroke engine.

    However, I do not think my comparison formula made any difference in the Rotary engine comparison - to the other combustion engines performance.

    Click image for larger version. 

Name:	Fair engine performance comparrison.JPG 
Views:	48 
Size:	183.6 KB 
ID:	515370

  19. Likes Instigator liked this post
  20. #480
    Join Date
    Jun 2007
    Location
    Singapore/Melbourne/Italy
    Posts
    9,097
    Thanks (Given)
    1008
    Thanks (Received)
    354
    Likes (Given)
    4297
    Likes (Received)
    1951
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    How high can a rotarys compression ratio be?

Page 32 of 34 FirstFirst ... 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Chris Carson's Marine