Page 2363 of 2364 FirstFirst ... 136318632263231323532361236223632364 LastLast
Results 35,431 to 35,445 of 35451

Thread: ESE's works engine tuner

  1. #35431
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    10,689
    Quote Originally Posted by Frits Overmars View Post
    Ken, my proposal is no better than the BMEP-approach. I only left out the constants, so everybody should be able to do the math.
    Speaking of which, I translated the Crecy's 5.1" bore x 6.5" stroke into 129,54 x 165,1 mm, giving 2175,93 cc per cylinder and 26.111 cc altogether.
    I could not discover at what rpm the Crecy produced its maximum of 2729 hp, so I assumed it to be at the 2500 rpm that was quoted for its fuel consumption.
    This would give 0,0418 hp per cc per 1000 rpm, 26% better than the 0,0332 hp/cc/1000rpm of the (unblown) RSA.
    Makes me wonder what the RSA would do at the 100 kPa supercharger boost of the Crecy....
    https://ww2aircraft.net/forum/thread...e-crecy.50534/
    Attachment 348990
    The last version based on a single slave engine produced an estimated 5000HP from its 26 liters.

    Only six complete examples were built when the research was terminated in December 1945. An additional eight vee twins were built. Serial numbers were even, Rolls-Royce practice being to have even numbers for clock-wise rotating engines when viewed from the front. Crecy number 10 achieved 2500 hp on 21 December 1944. Subsequently single cylinder tests achieved the equivalent of 5000 bhp for the complete engine.
    no idea re the revs

    but
    The thrust produced by the two-stroke exhaust was estimated as being equivalent to an additional 30% increase in power at the propeller on top of the rated power of the engine, and was exceptionally loud.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  2. #35432
    Join Date
    12th March 2010 - 16:56
    Bike
    TT500 F9 Kawasaki EFI
    Location
    Hamilton New Zealand
    Posts
    2,411
    However, if it was going to seize, I’d take it in a tractor rather than 25,000 feet in the air…just a simple pain avoidance preference though…[/QUOTE]

    😁 I soon learnt to test the uniflow jet boat upstreem in the river.

  3. #35433
    Join Date
    8th February 2007 - 20:42
    Bike
    TZ400
    Location
    tAURANGA
    Posts
    3,356
    So , apart from ignoring all the hideous cubic inches and ft/lbs etc , it would appear that even running the 50cc at 17000 , using sleeve valve and other of the planet
    ancient technologies has no advantages , power density wise , over SOTA done properly.
    If only NoLuc was 1/2 way right , sigh.
    Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.

  4. #35434
    Join Date
    13th December 2018 - 18:06
    Bike
    1983 yamaha rd 250
    Location
    sweden
    Posts
    187
    325psi/22.4 bar x 17000 rpm x 50cc = 42 hp

  5. #35435
    Join Date
    12th March 2010 - 16:56
    Bike
    TT500 F9 Kawasaki EFI
    Location
    Hamilton New Zealand
    Posts
    2,411
    325 BMEP , supercharged.
    Actually last versions of Crecy were compound turbo / supercharged. Exhaust turbine added to crank power.
    Im guessing that was more than 325 BMEP. However that is calulated?

  6. #35436
    Join Date
    13th August 2020 - 20:54
    Bike
    Derbi DRD pro
    Location
    Finland
    Posts
    4
    Quote Originally Posted by wobbly View Post
    Why do you want steps or fins on the back side of the combustion chamber.
    This is one of those old Monkey see Monkey do scenarios.
    Cooling the chamber , does nothing but pull heat out of the combustion process.
    The more heat in the chamber , the greater the gas expansion , the greater the power.
    Throwing away heat into the water , is throwing away horsepower.
    The better thing to spend time or money on is to arrange water to get close to the plug threads , and ceramic coat just the chamber , not the squish band , to retard heat loss into the water.
    Thanks Wobbly!
    New head is now almost ready. I followed advice and focused getting water closer to the plug. Original plug hole o-ring was changed from axial to radial style and is now smaller diameter.


  7. #35437
    Join Date
    12th March 2010 - 16:56
    Bike
    TT500 F9 Kawasaki EFI
    Location
    Hamilton New Zealand
    Posts
    2,411
    Id still tend to run a uniflow OP setup. One advantage, (and there are many), even though its got two pistons, its still a single cylinder. One combustion chamber. Good for where you are allowed only one cylinder. Or for that matter twin cylinder racing. Four pistons.

  8. #35438
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    10,689
    Okay, i found some RPM data.
    Click image for larger version. 

Name:	2000 hp at 2600 rpm.JPG 
Views:	95 
Size:	196.8 KB 
ID:	348993
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  9. #35439
    Join Date
    28th August 2015 - 00:01
    Bike
    1975 Hodaka Wombat
    Location
    Eugene, Oregon, USA
    Posts
    243
    The single cylinder test I referenced was run at 3750 rpm. The speed was increased to 4000 rpm but some sleeve damage resulted, shutting down the program. The Bosh style fuel injection pump was a limiting factor at its maximum pumping volume. This is an engine with a 5.5 inch stroke.

    Lohring Miller

  10. #35440
    Join Date
    26th April 2013 - 21:55
    Bike
    BMW R1200R 2009
    Location
    Belgium
    Posts
    102
    I found this historic overview of the sleeve valve engine, interesting reading i think.
    The engineers who build engines like that were ahead of their time.
    file:///C:/Users/peter/AppData/Local...s-14-00616.pdf


    It is so sad, that after the war, the company destroyed the existing crecy prototypes...

  11. #35441
    Join Date
    26th April 2013 - 21:55
    Bike
    BMW R1200R 2009
    Location
    Belgium
    Posts
    102
    And this looks like a modern incarnation of the incredible Junkers Jumo from WW II : the Achetes 3 cylinder opposed piston engine. https://www.youtube.com/watch?v=UF5j1DvC954

  12. #35442
    Join Date
    26th April 2013 - 21:55
    Bike
    BMW R1200R 2009
    Location
    Belgium
    Posts
    102
    This is interesting from start to end, but the real message is in the last 30 seconds of the video.
    https://www.youtube.com/watch?v=zf6OH4iVUkY

  13. #35443
    Join Date
    23rd March 2015 - 21:24
    Bike
    Conti RX356 V3
    Location
    Germany
    Posts
    72
    Quote Originally Posted by sniemisto View Post
    Thanks Wobbly!
    New head is now almost ready. I followed advice and focused getting water closer to the plug. Original plug hole o-ring was changed from axial to radial style and is now smaller diameter.

    I changed the water flow through the MHR cylinder by closing the holes above the exhaust and opening a passage in the back of the cylinder in the insert. this requires relocating the water outlet to the front and a vent in the cover. helped quite dramatically with power stability over time...

  14. #35444
    Join Date
    12th March 2010 - 16:56
    Bike
    TT500 F9 Kawasaki EFI
    Location
    Hamilton New Zealand
    Posts
    2,411
    Quote Originally Posted by Peter1962 View Post
    This is interesting from start to end, but the real message is in the last 30 seconds of the video.
    https://www.youtube.com/watch?v=zf6OH4iVUkY
    All diesels though. Completely different to a petrol OP uniflow.

  15. #35445
    Join Date
    28th August 2015 - 00:01
    Bike
    1975 Hodaka Wombat
    Location
    Eugene, Oregon, USA
    Posts
    243
    I love that engine. I plan to learn CFD to help refine my design for a 60cc opposed piston engine. I wish someone had "discovered" opposed piston engines in my youth. Then the GM two stroke was the most advanced two stroke diesel. There would definitely have been a place then for a better design. Today, I'm afraid it's too late for new IC engines. Most of the work is toward electrics with battery and/or fuel cell power. A similar opposed piston engine by Eco Motors has died. They considered a gasoline small version. See below for their engine and ignition solution. That company is dead, and my friend who worked there has moved on. Achates does have some significant government contracts. I hope it works out.

    Lohring Miller

    Name:  213608-5fc947ecd1a6db480e60fd5573ecbd1c.jpg
Views: 219
Size:  7.2 KBName:  213609-3c076caf100b42594f680720279e3992.jpg
Views: 220
Size:  7.9 KBName:  213610-ccb21f401dfff39f0e8ed4e289d8ab13.jpg
Views: 219
Size:  8.3 KBClick image for larger version. 

Name:	opoc cutaway.jpg 
Views:	67 
Size:	73.6 KB 
ID:	349002

Thread Information

Users Browsing this Thread

There are currently 12 users browsing this thread. (0 members and 12 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •