Ray Stadia Posted September 8, 2015 Report Share Posted September 8, 2015 A Two Valve Jawa. :approve: I recently read that the new Norton, is 2 valves per cylinder, which surprised me with a modern engine! 1 Quote Link to comment Share on other sites More sharing options...
Vince Posted September 9, 2015 Report Share Posted September 9, 2015 It's been said before but make a 2 valve Jawa short stroke with light flywheels (which is what would happen) and it wouldn't be even slightly more reliable than what you have now. Quote Link to comment Share on other sites More sharing options...
speedibee Posted September 9, 2015 Report Share Posted September 9, 2015 I recently read that the new Norton, is 2 valves per cylinder, which surprised me with a modern engine! I think the new Norton only has exhaust valves , its high pressure direct injection no need for inlets Quote Link to comment Share on other sites More sharing options...
speedyway Posted September 12, 2015 Report Share Posted September 12, 2015 The engines rev 10-15000 rpm. I was reading about F1 engines having pneumatic springs to cope. Would a speedway bike be allowed a gas bottle on them to run some valve springs? I think it would make the engine run faster. Plus the engine wouldnt have to compress the springs so it should become easier to turn and have less losses in the mechanicals. http://scarbsf1.com/valves.html Quote Link to comment Share on other sites More sharing options...
Alan_Jones Posted September 15, 2015 Report Share Posted September 15, 2015 Billy Hamill took a GTR engined bike across the El Mirage lakebed at 142.8 mph at the weekend. As a rookie he wasn't allowed a record attempt and had to stay below 150 mph so he'll be having another go at the October meeting. https://pbs.twimg.com/media/COvv_HrUEAAVIMX.jpg https://pbs.twimg.com/media/CO4K3D8UEAAJF13.jpg Quote Link to comment Share on other sites More sharing options...
SCB Posted September 15, 2015 Author Report Share Posted September 15, 2015 He got 144mph out of a JRM/Jawa so in terms of top end speed theres not a lot between them. Quote Link to comment Share on other sites More sharing options...
oldace Posted September 15, 2015 Report Share Posted September 15, 2015 He got 144mph out of a JRM/Jawa so in terms of top end speed theres not a lot between them. Top end speed isnt, and never has been the be all and end all. The dohc 4 valve jawa was much quicker than the weslake, in a race down the motorway the jawa would win every time. Despite that the jawa was rarely the weapon of choice because converting that rpm to forward motion was difficult. Quote Link to comment Share on other sites More sharing options...
SCB Posted September 15, 2015 Author Report Share Posted September 15, 2015 Top end speed isnt, and never has been the be all and end all. The dohc 4 valve jawa was much quicker than the weslake, in a race down the motorway the jawa would win every time. Despite that the jawa was rarely the weapon of choice because converting that rpm to forward motion was difficult.I agree. Especially as no speedway bike is ever going to 150mph! If they hit 70 they're going some! Plus isn't a speedway bike ( like most racing engines really) more about getting a steady and even power through the revs (or at least through the bit you use!) rather than the more the curved shaped (when looked at on a graph)? Quote Link to comment Share on other sites More sharing options...
Bream Posted September 23, 2015 Report Share Posted September 23, 2015 A bit off topic but still about engines. Is there anyone who speaks czech? Found an article about new Jawa engine. Looks like a two valve? http://www.speedwaya-z.cz/?cat=1248 Quote Link to comment Share on other sites More sharing options...
Ray Stadia Posted September 23, 2015 Report Share Posted September 23, 2015 A bit off topic but still about engines. Is there anyone who speaks czech? Found an article about new Jawa engine. Looks like a two valve? http://www.speedwaya-z.cz/?cat=1248 I did press the translate button and did get English words, but still none the wiser really! I think, maybe, it is an engine which needs infrequent servicing, similar to the Gerhard....but might be making 2+2=5! Quote Link to comment Share on other sites More sharing options...
PHILIPRISING Posted September 23, 2015 Report Share Posted September 23, 2015 A bit off topic but still about engines. Is there anyone who speaks czech? Found an article about new Jawa engine. Looks like a two valve? http://www.speedwaya-z.cz/?cat=1248 THINK Sam Ermolenko might be involved. Also that it could be 570cc... 1 Quote Link to comment Share on other sites More sharing options...
MattK Posted September 23, 2015 Report Share Posted September 23, 2015 THINK Sam Ermolenko might be involved. Also that it could be 570cc... Classic Sam! 2 Quote Link to comment Share on other sites More sharing options...
iris123 Posted November 4, 2015 Report Share Posted November 4, 2015 This all makes for very interesting reading(well I did get a little bored!!!) concerning Gerhard and a complaint from ex rider Richard Speiser that he nicked his idea.The lawyers are rubbing their hands at least http://www.speedweek.com//sandbahn/news/84022/Richard-Speiser-wurde-um-den-eigenen-Motor-betrogen.html Quote Link to comment Share on other sites More sharing options...
Bream Posted December 5, 2015 Report Share Posted December 5, 2015 (edited) http://dmon-parts.de/shop/GTR-Speedway-Motor/GTR-500-Speedway-Testmotor?source=2&refertype=1&referid=383 GTR 500 is for sale now. What happened to the problems with Speisser? Edited December 5, 2015 by Bream Quote Link to comment Share on other sites More sharing options...
Guest Posted December 5, 2015 Report Share Posted December 5, 2015 (edited) This is off-topic but I would be interested in a response. Marcel Gerhard (Switzerland) was winner of the world long track championship in the 1980s (?) and also excelled on grass tracks. I have a recollection that (a) he also worked at one time for Otto Lamtemhammer and (had a couple of seasons with a German speedway league club? Edited December 5, 2015 by Guest Quote Link to comment Share on other sites More sharing options...
drosser Posted December 14, 2015 Report Share Posted December 14, 2015 I did press the translate button and did get English words, but still none the wiser really! I think, maybe, it is an engine which needs infrequent servicing, similar to the Gerhard....but might be making 2+2=5! Czech is a doodle - if you use Google Translate and do not really want to know what is said. Result is "So until then Divišovská factories in speedway motorcycles JAWA about a year ago came two likeable Poles, one said I Mirek Dudek and I buy from you spare parts for nearly all of Poland, and this is my friend Slavek Walczak, who, although a company on airplanes, but corner dušičky terribly cheers speedway. And we are looking for a partner for our maybe a little crazy idea - to return the old glory back to the speedway scénu.c Return to times of old matadors from the fifties and sixties, when he drove in two - three types of engines, the rider know how you have to tune the engine, which could put a rosette, but also necessary when deemed properly take and when little permit. Until after the start on the track is always something happening, which was during one round to see several overtaking each other many times when - as they say - drove his head and hands. I sort of forgot feet. Until engine components were not working at the limit of their technical capabilities and still have enough power to the beautiful plant. Do I want to add to the time when stadiums beautifully smelled burnt riciňák, roaring exhausts without shock and environmentalists did not mind, because not yet born. And no federation did not dictate who will be this year - excuse me back then - do exhausts, who deflectors - but they really were not at all - and perhaps one year will make brake lights, because a federation officer noticed that the bike has no brakes. I was talking. It all tenkrátbylo people do not care. And at that time on the speedway - Speedway - went hundreds of thousands of crowds. Remember thirties Strahov? A quarter of a million visitors! Well, I do not remember, but I would like to see it. 7Zkrátím it - a partner in Divišov found. I loved the idea factory to return to dvouventilu, reduce speed but increase the volume, it will get bigger and krouťák basically prohibit tuning. It is a step forward or back? Rider under him will have a powerful motorcycle, all the same conditions, and now show, matador! Ride more head than artificially dialed engine! Because the motor NSF, or 500+, or even pětsetsedmdesátka it needs. In Divisov they are convinced that this is a step forward. A step that stadiums will attract more riders, because the engines will have thanks to its parameters, inter alia substantially longer shelf life - estimated at up to three times a divišovští secretly hoping for even multiple of four. This is the once popular sport cheaper, fall Tuning, which now reach up to four times the price of the engine, but what was put there for this price natunit? Or is it rather a well-sold "tuzing"? Therefore, managers of factories to their new at that time, a friend from Poland added. A constructed from existing engines already mentioned pětsetsedmdesátku. Dvouventil. It was a long job. And there will be long. Need to reduce engine vibration. That helped today an important collaborator Mr. factories. Měkuta. Budějičák. Great guy and also very technically minded. As well as to lighten the engine as a whole because its components are less stressed. How to choose the other piston, which may also be more subtle. Perhaps instead of a pound will have just three quarters. Simply because it is a minute třinácttisíckrát moves in the cylinder, but only osmitisíkrát. And it is in the design of the motor damn difference. So should add that today my Divisov said that the first engine test runs between August 2014 and except for regular oil changes did not touch him. Bach said neseřizovali or valves! It sounds like a fairy tale, I'll follow along. Because, in my slumbers such a tiny seed of mistrust. We'll see over time! Slowly add the project to the English. And especially for all interested riders. The whole event was divišovští up trying to keep under wraps. Could not do it. It's outside. Meanwhile, these engines run at exhibitions. Income from them will pass on eventual treatment of injured athletes in the classic speedway. Finally, it is the intent of this new direction, he says New SpeedwayFoundation - New Foundation Speedway, as this would probably be translated, returning speedway stadiums, among people to start going to the grandstands, because everyone from this direction promise substantially greater experience in those four rounds between start and finish. Because people want to be entertained. No watch as the four horsemen ride in the same order all four wheels. From start to finish. And I'm starting to believe that the intent pětsetsedmdesátkám lead. It will need a little gift to pětašedesátinám ESA. So it was rumored after Divisov. What do you think? Write your review! Well, what I am going, editor, talk! In Divisov, August 2, 2015" Well - I tried! Obviously, i is not just people like me who would like to see the Formula 1 attitude of 'faster must be better - no matter the cost or the deterioration in spectacle. "4 riders on equal machinery with a well prepared track" - not too many parameters in that equation. Should be easy to implement, you would think. O.K. it may not bring back hundreds of thousands of spectators in today's era but it is a tried and tested formula which might just work - if the authorities ever decide to take their responsibilities seriously before rider costs and spectator boredom kill the sport off. 2 Quote Link to comment Share on other sites More sharing options...
damosuzuki Posted December 18, 2015 Report Share Posted December 18, 2015 (edited) Y Edited December 18, 2015 by damosuzuki Quote Link to comment Share on other sites More sharing options...
damosuzuki Posted December 18, 2015 Report Share Posted December 18, 2015 (edited) Saw tigers following this on Twitter. Hope it comes to something. I'd also like to see formula 2 adopted at least at training level Edited December 18, 2015 by damosuzuki Quote Link to comment Share on other sites More sharing options...
Bream Posted January 4, 2016 Report Share Posted January 4, 2016 (edited) http://www.bahnsporttechnik.de/html/body_gtr-motor.html#GTR-Motor Some info about GTR engine. Like I predicted earlier it is DOHC engine with stronger (modern) cam chain, oil filtering and oil jets for the cams. Edited January 4, 2016 by Bream Quote Link to comment Share on other sites More sharing options...
speedibee Posted January 8, 2016 Report Share Posted January 8, 2016 wonder who will be the first tuner to fit this http://lanesplitter.jalopnik.com/suzukis-new-gsx-r1000-is-engineered-around-a-loophole-i-1751372078?rev=1452123201861 Saw tigers following this on Twitter. Hope it comes to something. I'd also like to see formula 2 adopted at least at training level hope not . Formula 2 engines are just as expensive as speedway engines to maintain , they dont ride properly . and on achieving a moderate level of competence ,a whole load of new expense and a new learning curve has to be adopted switching to proper speedway equipment . budget cost engines of a sutiable nature are still available , they are called 2 valve Jawas 1 Quote Link to comment Share on other sites More sharing options...
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