| Author |
Message |
    
Kenm123t
| | Posted on Wednesday, June 06, 2012 - 09:23 pm: | 
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The bikes are doing well. As its been stated before " Its the Indian not the Arrow" Josh Hayes is at the peak of his career and an amazing talent. he will dominate the series for at least 2 more years if he can stay healthy. The rest of the top riders are closely matched and racings uncertainties will determine the winner.
Danny and Geoff are developing as fast as the bikes. Hayes is already thinking about that along with the EBR bikes
We are seeing the best AMA racing in many years its no longer UJM parade thanks to EBR KTM and BMW. Great stuff |
Sifo
| | Posted on Wednesday, June 06, 2012 - 09:25 pm: |
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Don't beat him... Sign him! |
Davegess
| | Posted on Wednesday, June 06, 2012 - 11:32 pm: |
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Don't beat him... Sign him!
I think Yamaha has taken care of that detail, they have the bucks and a few incentives EBR is lacking like WSBK and MotoGP rides. |
Hughlysses
| | Posted on Thursday, June 07, 2012 - 06:31 am: |
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Husky- that was a cool article. Seems like valve springs have been the bane of NASCAR mechanics for a long time. I remember reading an interview with team owner/mechanic Bud Moore some years ago. He said that back in the early 70's when they were running Ford 351 Cleveland engines they had severe valve spring problems. He related how his crew and others would change all the valve springs after practically every practice run as the springs wouldn't hold up to long periods of high RPM. Apparently the crews got VERY good at changing valve springs quickly. |
Boogiman1981
| | Posted on Thursday, June 07, 2012 - 06:52 am: |
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does make me wonder who the supplier is for rotax and what their processes are to create the springs |
Ducbsa
| | Posted on Thursday, June 07, 2012 - 07:27 am: |
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Without having any actual knowledge, I assume that spring winding is a pretty mature technology and the difference is in the metallurgy. With NASCAR and Indycar 500 mile races, 24 hour sports car races and F1 (although they can be springless), you'd think that good metallurgy is figured out. But, that is the benefit of no knowledge! |
Boogiman1981
| | Posted on Thursday, June 07, 2012 - 08:21 am: |
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yes with the advent of CNC driven machines the winding for the most part is handled. the metallurgy is the area for improvement according to that article. not only the metal but how it's treated coated etc as well. |
Fast1075
| | Posted on Thursday, June 07, 2012 - 11:21 am: |
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In ProStock motorcycle (at least for the Suzuki) It is common practice to change the valve springs after an event. 3 qualifying passes and 4 competition passes (if you make it to the final round). That is less than 3 minutes run time at high rpm including the burn outs and the passes.
My motorcycle spring of choice is APE. I have never suffered a spring failure. |
Boogiman1981
| | Posted on Thursday, June 07, 2012 - 11:27 am: |
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that's cool info to have thank you for sharing. was reading more on valve springs and there are some very different things that PSI does to the ones destines for drag use vs endurance use. |
Firemanjim
| | Posted on Thursday, June 07, 2012 - 01:57 pm: |
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Have APE in the Busa and Kibblewhite in turbo 750/600. No failures of valve related nature. Multiple(lots) of 200+ MPH passes.
And I am known on our team for going WFO and to limiter for miles! Let that tire spin a bit,friction drive! |
Boogiman1981
| | Posted on Thursday, June 07, 2012 - 02:17 pm: |
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Very cool jim thanks for the report. |
Davegess
| | Posted on Thursday, June 07, 2012 - 03:24 pm: |
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I think Danny's issue as that he spun that thing WAY above the red line not that the springs are bad. |
Bob_thompson
| | Posted on Thursday, June 07, 2012 - 05:00 pm: |
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With that said Dave, my gearhead question would be: just what went away, valve springs, rods, bearings, valves themselves. rings (why it started smoking and the engine was still running), guides, etc.
I know Erik & especially Michael Tjon probably already know and do not seem overly concerned with Dannys over reving the engine but its still something they will have to address and will I'm sure. Especially if they eventually try and wring some more power out of it. It would just be nice to know but we probably will never learn just what it was. And thats OK.
Looking forward to Barber. |
Anonymous
| | Posted on Thursday, June 07, 2012 - 05:15 pm: |
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Absolute best in class valve springs in the 1190RS. Downshift from 5th to 3rd with a quick shifter, and not many engines will survive...Danny has slipper clutch basically off because he likes to back the bike in. Rev limit 11,800. Absolute max over rev limit = 12,500. Double downshift = 13,200. End of story, end of motor being happy. Good news is he was able to ride it in sick, so nothing catrastrophic. Strong motor! |
Hughlysses
| | Posted on Thursday, June 07, 2012 - 06:30 pm: |
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Thanks for the info Anony. I thought it was pretty impressive that despite the fact the bike was smoking like hell on decel, Danny didn't seem to be down on power any after the incident. |
Fast1075
| | Posted on Friday, June 08, 2012 - 06:06 am: |
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Maybe it killed the intake valve seals. That would account for pulling oil in under high vacuum decel conditions.
I had that happen on a nitrous Kawi motor when it broke the transmission while WFO. Same effect, RPM to the moon. No rev limiter can rein in a nitrous motor when it gets unloaded at full throttle.
Motor ran fine, had no leakdown issues, but smoked like a tar pot. The valve guide seals were trashed. |
Reepicheep
| | Posted on Friday, June 08, 2012 - 09:15 am: |
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So you can rev an EBR1190 to 13,200 RPM! ...once |
Hughlysses
| | Posted on Friday, June 08, 2012 - 10:26 am: |
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That makes sense about the valve seals. I guess they'd wind up being sort of an "emergency bumper stop" for the floating valves, which might actually prevent much worse damage. |
Anonymous
| | Posted on Friday, June 08, 2012 - 05:22 pm: |
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Pretty sharp, Fast1075! |
Team_ruthless
| | Posted on Friday, June 08, 2012 - 06:44 pm: |
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Word on the street is the ecoboost 3 cylinder motorcycle engine that EBR is developing with Ford will wind up to 24,750 rpm! |
Court
| | Posted on Friday, June 08, 2012 - 08:11 pm: |
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Well . . . my favorite was the RC113 and RC166
http://www.youtube.com/watch?v=eaRop_ZMwo0&NR=1
Learn more HERE
(Message edited by court on June 08, 2012)
(Message edited by court on June 08, 2012) |
Fast1075
| | Posted on Saturday, June 09, 2012 - 07:00 am: |
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There were all sorts of interesting motorcycle technologies spawned by Gp racing in the 60's. When I went to school at the Honda training facility in 1973, they had a RC149 engine disassembled and laid out in a glass case.
Words cannot describe the detail in that motor. 125cc five, yes five cylinder. DOHC four valve gear drive valvetrain. The parts were TINY. They won three world championships with that motor.
Imagine the sound of one going past at 21k rpm!!! The sound from the film made at a race was more like the sound of a near miss from a bullet than the sound you would think would come from a motorcycle engine.
Honda wasn't alone. EVERYBODY was shooting for the technological moon. Those days led to where we are today. |
