| Author |
Message |
    
Cyclonedon
| | Posted on Sunday, March 17, 2013 - 10:50 pm: | 
|
I watched the second race tonight and once again didn't see any EBR machines challenge the Yahamas or Suzuki's. All the high end performance seems yo be coming from the inline 4's.  |
Sparky
| | Posted on Monday, March 18, 2013 - 02:12 am: |
|
Well, the EBRs weren't 100% - that's racing. So because the results weren't favorable, don't lose heart because the bikes are still under development... (still).
Yes the IL4s may have certain advantages on high speed tracks like Daytona, but many other tracks in the season can favor the big twins's torque advantage from turn to turn. |
Smoke
| | Posted on Monday, March 18, 2013 - 06:59 am: |
|
that's why they call it the racing season! some tracks are extremely difficult on equipment and Daytona is about the worst for that. if you look at the results for the weekend you will see a very high amount of attrition of all brands. i'm sure a lot of data was gathered for the next one. BETTER LUCK NEXT TIME! see you at Road America! |
Reepicheep
| | Posted on Monday, March 18, 2013 - 08:24 am: |
|
Clearly, the racing rules still favor the inline fours over the twins. It is what it is.
I think it is great to see the EBR bikes out there and competiting well. Even the second Daytona race, where all the EBR's didn't finish, was still a pretty strong showing... they were running strong for much of the race.
I owned one inline four street bike. Amazing top end, everything else about it was pretty annoying. I'd prefer to never own another one if I can avoid it. So I'm glad there are bikes other than inline fours trying to race, even if they are at a disadvantage. |
Xb1125r
| | Posted on Monday, March 18, 2013 - 08:30 am: |
|
I wonder what caused the engines to fail.
last year they had better success. it must be something they did that caused all the racer bikes to fail. or is it the track, i heard they made the course longer then last year, if so could the higher rpms caused this at the chicanye. I think th lack of power in the stright really hurt the twins, the yamahas locked over 200mph, i believe the fastest ebr was at 196. |
Fast1075
| | Posted on Monday, March 18, 2013 - 08:51 am: |
|
At least one engine broke a rod. But not all of the problems were engine related per se. Clutch problems (all brands had clutch problems), and one case of front tire slipping on the wheel, causing an imbalance.
An 1190 twin needs comparatively large valves. Large valves are heavy, requiring higher pressures to control them. Often it is not the strength of the parts that is the problem, but the harmonics of the valvetrain. If it lost control of the valve, and spit a shim, it could alter the timing enough for the valve to hit. |
Reepicheep
| | Posted on Monday, March 18, 2013 - 10:40 am: |
|
quote:At least one engine broke a rod.
Was that the Josh Hayes Yamaha R1? Or did one of the EBR 1190's break a rod also? Not surprised if it did, I have now idea how the twins are supposed to be competitive at Daytona under the current rules, so they have to be pushed right to the hairy limit.
Anyone else hear 207 MPH trap speeds down the rear straight for the R1? That's an insane amount of power. |
Jumbo_petite
| | Posted on Monday, March 18, 2013 - 11:59 am: |
|
Eslick seems a lot better on the Suzuki than the EBR so who knows?
I think if you factor out the inherent advantages of the I4s and electronics package over last years EBR1190RS you will find that Danny was running near parallel this year to where he was last year. At Miami and NOLA last year danny proved he had the pace on the front runners without electronic aides. I miss not seeing him on an EBR but expect him to challenge for the championship on his new Suzuki. I am hoping Aaron takes to the EBR like Danny |
Reepicheep
| | Posted on Monday, March 18, 2013 - 12:59 pm: |
|
Both times I met him, Eslick seemed like a great guy. I wish him luck whatever he is doing.
(But I also hope Geoff beats him on an EBR.  ) |
Smoke
| | Posted on Tuesday, March 19, 2013 - 07:05 am: |
|
top speeds race 1 and 2. http://results.amaproracing.com/xml/RR/events/R130 5/SBF1SEG.pdf
http://results.amaproracing.com/xml/RR/events/R130 5/SBF2SEG.pdf
tim |
Xb1125r
| | Posted on Tuesday, March 19, 2013 - 08:01 am: |
|
I think Pegram says a lot about the Yamaha group. he got 2 podiums. I can't remember the last time he was on a podium. He has to be the most improved racer and ofcourse Cardenas, showing th the other suzuki boys how is done. |
Bads1
| | Posted on Tuesday, March 19, 2013 - 01:54 pm: |
|
Larry never had to improve hes great but hes also on the best developed bike. Cardenas we'll have to see if he will continue. He showed the yamaha boys nothing yet. Hayes had clutch issues first race and second race he had a mechanical. The other Josh beat Cardenas first race and on a unsorted bike. It was loose and you could see it was. Second race he made a mistake with a false neutral that fprced him to go striaght or he would of layed it down. The true track racing starts at RA. |
Firstbuell
| | Posted on Tuesday, March 19, 2013 - 06:33 pm: |
|
great info, Smoke - thx
AMA Pro offers up a nice variety of info |
Mog
| | Posted on Tuesday, March 19, 2013 - 09:11 pm: |
|
Larry did do very well as did Herrin. My question is this... If the Yamaha is a 4 cylinder 'cross plane' that mimics a twin (?) because of two pistons down on a power stroke, then are the two spark ignitions slightly different to lengthen the firing dwell time? And does that dwell time get altered as it approaches a higher rev limit?
The harmonics of the combustion sequence may alleviate the tendency to rotate the wheel in the tire and also permit a softer power pulse. EBR's Twin is absolutely amazing to run against the Suzuki and Yamaha engines.
Even with all the talent at EBR's dispose there needs to be the capability to generate the (equivalent) 203 mph trap threshold required at Daytona as well as Road America.
I would be interested in any ideas about the comparison of the Cross plane configuration now, after last year and this recent race. Some of you have a great understanding of the process and I would certainly appreciate getting my head better wrapped around the engine issue. The EBR just shines on handling. Thanks Erik and team!!! |
Guy_glover
| | Posted on Wednesday, March 20, 2013 - 12:39 am: |
|
Erik said that if they gear the bikes to handle the straights , it puts them at 4200 RPM in second gear in both chicanes. Would make the bikes need to go to 1 st gear which wouldn't make it through the corner without a first to second shift. A 1-2 shift in a corner would be too violent on just about any bike. I figured a different ratio trans would solve that but I'm not sure that is allowed in AMA. |
Nobuell
| | Posted on Wednesday, March 20, 2013 - 09:29 pm: |
|
Mog,
The rotated tire was on the front from braking and was attributed to Arron's extra weight. |
Hughlysses
| | Posted on Wednesday, March 20, 2013 - 09:40 pm: |
|
The rotated tire was on the front from braking and was attributed to Aaron's extra weight.
Interesting- well, obviously the ZTL (or whatever EBR's designation for it is since the ZTL copyright apparently belongs to HD) is working extremely well on these bikes. I'd guess they can take the same steps they did to prevent rotation of the rear tires from the massive engine torque (no tire lube when mounting, anything else?). |
Firstbuell
| | Posted on Friday, April 12, 2013 - 12:13 pm: |
|
progress!
Full-Length AMA Pro Race Videos From Daytona Now Available For Free On-Demand Online Viewing
http://www.roadracingworld.com/news/full-length-am a-pro-race-videos-from-daytona-now-available-for-f ree-on-demand-online-viewing/ |
Sparky
| | Posted on Friday, April 12, 2013 - 01:12 pm: |
|
Cool!
I wish someone would do the same for WSB. |
