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Fortuna |
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Fortuna World Chat Champion
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Nath |
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Nath World Chat Champion
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Fortuna |
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Fortuna World Chat Champion
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Kickstart |
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Kickstart The Oracle
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Vin |
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Vin World Chat Champion
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Posted: 23:44 - 16 Feb 2006 Post subject: |
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Awwee nuts I go away for a couple of days and miss a 4 v 2 stroke thread.
As far as I am concerned you can blah on about the relative merits of each but as a pound for pound good laugh 2 strokes rule. Oh and I love the smell.
Vin
P.S. Kickstart I am glad you mentioned the 2 stroke fiestas nobody I tell about that ever believes me. mmm a fiesta with spannies |
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fuzz |
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fuzz World Chat Champion
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Kickstart |
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Kickstart The Oracle
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lilredmachine |
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lilredmachine World Chat Champion
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Kickstart |
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Kickstart The Oracle
Joined: 04 Feb 2002 Karma :
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Posted: 13:53 - 17 Feb 2006 Post subject: |
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Hi
Interesting design. Suspect it would work rather better with more cylinders. Suspect that if you could get direct fuel injection working on it (should be easy with the revs he is talking about) then it could be simplified. But then it would be close to a conventional 2 stroke using a stepped piston (which would enable a 2 stroke to run on petrol, rather than petrol and oil), but with some extra drag from running a 2nd crank.
All the best
Keith ____________________ Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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veeeffarr |
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veeeffarr Super Spammer
Joined: 22 Jul 2004 Karma :
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lilredmachine |
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lilredmachine World Chat Champion
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fuzz |
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fuzz World Chat Champion
Joined: 24 Mar 2004 Karma :
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Posted: 14:08 - 17 Feb 2006 Post subject: |
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Valve timing is a problem with 2 strokes. Disc valves over reed valves offer more scope for induction, but the exhaust port is timed by the piston. Even power valves cant solve that. ____________________ https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800 |
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Kickstart |
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Kickstart The Oracle
Joined: 04 Feb 2002 Karma :
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Kickstart |
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Kickstart The Oracle
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fuzz |
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fuzz World Chat Champion
Joined: 24 Mar 2004 Karma :
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Posted: 14:13 - 17 Feb 2006 Post subject: |
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Is that the one with camless valves?
Just found this while searching for the above:
Quote: | A turbocharged car engine with electronically activated intake and exhaust valves, that can switch from 4 stroke cycle to 2 stroke cycle when the turbocharger is providing boost, thereby nearly doubling the power output.
The engine would operate as a normal 4 stroke at low throttle settings. At higher throttle settings, when the turbo is producing enough boost to scavenge the cylinders with both the intake and exhaust valves open simultaneously, the engine would operate as a two stroke (I believe this is how a turbo 2 stroke diesel locomotive works, but it uses an auxiliary compressor for starting). Apparently electronic valving is now being produced by some auto manufacturers. This allows the separate throttle valve to be done away with, along with the associated turbulence losses and extra boost lag it introduces. Also, direct injection into the combustion chamber could be used to prevent unburned fuel from being swept out the exhaust when 2-stroking, thereby reducing the emmisions normally associated with 2 strokes. For further improvement a Comprex pressure wave supercharger could be used instead of a turbo, allowing increased boost at low engine speeds.
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So maybe the 2 stroke isn't dead and buried after all. ____________________ https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800 |
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Kickstart |
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Kickstart The Oracle
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fuzz |
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fuzz World Chat Champion
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Fortuna |
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Fortuna World Chat Champion
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Kickstart |
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Kickstart The Oracle
Joined: 04 Feb 2002 Karma :
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Posted: 14:46 - 17 Feb 2006 Post subject: |
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Hi
Well, that would work for such a valve on a 2 stroke.
The could be fun. Mix in these virtually infinitly variable valve timing options, stick on the Saab system which allows variable compression ratios, one of the systems giving a variable inlet tract length (MV have such a system) and then all you need is some way to alter the exhaust length (Ferrari are already partly there). Power all over the place.
All the best
Keith ____________________ Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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bish777 |
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bish777 World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 14:22 - 18 Feb 2006 Post subject: |
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Ah no. This one was wierd, paralell twin with 180 degree crank. Instead of the fuel going from under the piston then through the transfer port to land up above the piston, the induction was under one piston in the traditional way then as it went down it forced the fuel through a transfer port into the opposite combustion chamber.
Picture may explain it better (only shows one 'half' of the porting). ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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NSR-Rulez |
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NSR-Rulez World Chat Champion
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AnaalBleacher |
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AnaalBleacher L Plate Warrior
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Chiz |
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Chiz Trackday Trickster
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NSR-Rulez |
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NSR-Rulez World Chat Champion
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Old Thread Alert!
The last post was made 18 years, 71 days ago. Instead of replying here, would creating a new thread be more useful? |
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