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5v3d3b0 |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 23:54 - 14 Jun 2007 Post subject: |
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Not economical, from what my college tutor told me, i asked him the same question a few weeks back.
EDIT: Keith beat me too it, and with a far better explanation. ![Razz](images/smiles/icon_razz.gif) ____________________ Banned till April 2011. |
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bish777 |
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mr.z |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 00:10 - 15 Jun 2007 Post subject: |
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Quote: | Suzuki's GT750 motorcycle was launched in 1971. The GT750 was Suzuki's competitor in a market populated by the likes of Honda's CB750 and the Kawasaki Z1. The GT 750 was also nicknamed the "Kettle" and the "Water Buffalo", for its liquid cooling system (and also in the latter case its substantial weight).
Never intended as a sportsbike, the GT was targeted more at the tourer market, hence the 'GT' nomenclature. Power output of the early models was a claimed 67 BHP, not especially impressive for the time. Handling and braking would, by modern standards, be considered alarming. Top speed in contemporary road tests was around 110 MPH.
In modern times the GT has acquired something of a cult status, mainly due to its two-stroke engine and the historical rarity of liquid cooling in this class.
As an aside, the GT 750 motor was the basis for the 180 MPH racing bike on which Barry Sheene had his infamous high-speed Daytona accident in March 1975. He went on to win the world 500 CC championship in 1976 and 1977. |
https://www.suzukicycles.org/photos/GT/GT750/1977_GT750_blue_540.jpg
The biggest i can think of at least..
Bit of an odd one.. all ways fancied one for the sheer ridiculousness of them
Add this to that allegedly a modern 50cc two stroke makes emissions close to that of a BUS, an old crap bus at that..
Interesting the FI point, aprilia were considering it for their 125s e.t.c. not sure why they didn't go ahead as they must have been pretty sure its doable.
Consider this though.. the amount of energy/emissions from manufacturing a 4stroke are far higher, vastly more complex engine with more parts, if dodgy Chinese 4strokes are only managing 5000 miles before terminal engine failures then has there been much of a gain environment wise? ![Question](images/smiles/icon_question.gif) ____________________ >RidingSkills<->Tech Tips<->MyBikes< |
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St0rmer66 |
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Kickstart |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 00:38 - 15 Jun 2007 Post subject: |
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Weren't some saabs 2stroke? (i'm sure a myriad of dodgy eastern block cars have been also) ____________________ >RidingSkills<->Tech Tips<->MyBikes< |
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hmmmnz |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 02:11 - 15 Jun 2007 Post subject: |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 09:18 - 15 Jun 2007 Post subject: |
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The biggest two stroke bike I can think of is the Ossa 1000 - basically two 500 twins stuck together... They raced one years back and it gained a reputation as a dangerous bike to ride... wonder why?
https://img.photobucket.com/albums/v237/DiggsUK/Ossa1000.jpg ____________________ Now - Speed Triple, old ratty GS550, GSXR750M
Gone (in order of ownership) - Raleigh Runabout, AP50, KH125, GP125, KH250, CBX550, Z400, CB750FII, 250LC, GS550, ZXR750H1, Guzzi Targa, GSX750F, KH250 x2, Bimota SB6R and counting... |
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5v3d3b0 |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 15:32 - 15 Jun 2007 Post subject: |
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Diesels are two stroke by nature and always have been (there are exceptions). I'd think it's fair to say that diesels are out of topic in the bike debate.
2 Stroke petrol engines have problems with upper engine lubrication. Smaller engines have less surface area to worry about, but as the CC increases, the surface area of the contact between metals also increases. However, you can't just keep adding more oil, and so it becomes self-defeating.
Materials technology might help. ![Smile](images/smiles/icon_smile.gif) |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 18:43 - 15 Jun 2007 Post subject: |
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I think the cathederals can be ignored as far as 2-stroke debate goes!
Previous attempts at big 2-strokes have lead to problems with overheating problems. The old kawasaki 750 triple was notorious for destroying the middle cylinder IIRC.
bish777 wrote: | A supercharged fuel injected two stroke would not require any expansion chamber. The FI means that fuelling can be precisely controlled so none is blown up the exhaust (making a expansion chamber redundant).
The supercharging also means the crankcase isnt used as part of the induction so can be sealed the same as a 4 smoke. It neednt be a high pressure supercharger, it only has to provide enough pressure to fill the cylinder at atmospheric pressure.
Should mean a cleaner greener stroker |
Seams that your dream is becoming reality;
hmmmnz wrote: | there is an ozzie that is currently working on a 6 stroke,
basically a 4 stroke bottom end with a 2 stroke top end (no valves just ports |
To be honest, i can only see one major downfall. Sure, the engine would burn less oil, be quieter and potentially be more reliable. But it would still need an expansion chamber to reduce emissions. The design of the 2-stroke engine means that the exhaust port is open while the piston is at the bottom of it's stroke, and inevitably some fuel will be lost through this gaping hole in the side of the bore.
another way round it would be to pressurise the mixture beyond atmospheric pressure using said supercharger, and inject it after the piston has gone past the exhaust port. There would be no increase in performance from this, but it would keep the engine clean and help the 2-stroke keep on living.
The thing is, new engines like this just aren't 2-strokes. A proper 2-stroke has an expansion chamber, burns gallons of oil, a powervalve blade in the exhaust and a full top-end rebuild can be done in under an hour. A new complex engine wouldn;t be the same, all the magic appeal of the 2-stroke would be lost.
Jack ____________________ www.bikepics.com/members/jackcheese <--- NOW FOR SALE! 51 Plate Cagiva Planet 125
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 18:53 - 15 Jun 2007 Post subject: |
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Beat me to it
I used to make the intercoolers for those buggers. ____________________ Bikers make great organ donors, get 115 on your licence today. |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 19:34 - 15 Jun 2007 Post subject: |
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https://en.wikipedia.org/wiki/Napier_Deltic
Two stroke diesel engine of epic proportions.
1650bhp per unit in rail traction applications (supercharged), 4000 or more in naval use (turbocharged).
It would of been widespread in rail traction had British Rail been a fan of running engines at high speeds (1500 RPM!!).
While I could go on about the size and weight advantages the best thing about them is the NOISE. ____________________ 18:54:48 Rob Fzs: jews don't give away stuff for free
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Old Thread Alert!
The last post was made 16 years, 316 days ago. Instead of replying here, would creating a new thread be more useful? |
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