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Old 01-10-2014, 03:33 PM   #406
arkansawyer
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I thought Jeff and Tony A. were banned from the races after playing laser tag. My memory isn't great, but I thought Tony was banned for a year and Jeff was banned for life. What is going on?
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Old 01-10-2014, 04:29 PM   #407
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Originally Posted by TooFast View Post
I was wondering if the new YZ250F motor with it's straight intake tract to the valves would show superior power, especially high rpm flow/power, potential is there more so in the 250s than their 450 which has enough power to be traction limited. The motor hasn't been available for very long, perhaps additional development time may bear fruit.
Time will tell, but I think reversed cylinder heads will eventually go the way of 5-valve heads and TRAC anti-dive brake systems - trumpeted as huge technical advances at introduction, but later found to be neutral at best.

- Mark
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Old 01-10-2014, 04:59 PM   #408
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Originally Posted by arkansawyer View Post
I thought Jeff and Tony A. were banned from the races after playing laser tag. My memory isn't great, but I thought Tony was banned for a year and Jeff was banned for life. What is going on?

Banned from the MX series, and anything owned or controlled by the Coombs family.

Most of their fights and silly shit are from the MX series over the years.

SX is run by a different company.
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Old 01-10-2014, 05:39 PM   #409
scottcolbath
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I'm down in the trenches with the camera gear tomorrow night for the Phoenix race.



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Old 01-10-2014, 08:35 PM   #410
D.T.
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Cool!
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Old 01-11-2014, 06:25 AM   #411
Gordy
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Garcia dominated Phx last year.

I'm saying he gets a second behind Stewart

RV fall down..........again

RD third.
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Old 01-11-2014, 06:42 AM   #412
Tee2
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Tomac says it's a maybe for today. He will decide today.

Our local Shane Sewell broke his foot at A1and is out for a month or so.
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Old 01-11-2014, 06:42 AM   #413
pvangel
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Fan of both Garcia




And Barcia And I pick Barcia on this one...



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Old 01-11-2014, 06:47 AM   #414
nachtflug
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is the start (and conclusion) an hour earlier tonight?
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Old 01-11-2014, 06:51 AM   #415
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Quote:
Originally Posted by markjenn View Post
Time will tell, but I think reversed cylinder heads will eventually go the way of 5-valve heads and TRAC anti-dive brake systems - trumpeted as huge technical advances at introduction, but later found to be neutral at best.

- Mark
You may very well be right. It's been quite a while since any new motor technology has been introduced on the 250s, last was FI. Without any bends, the Yamaha straight intake port allows for the least flow resistance and minimal turbulence, I thought the tuners would raise the rev limit and tune for resonance at higher RPM and have a horsepower advantage.
Intake ports like this have been on F1 cars for quite a while now for good reason.
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Old 01-11-2014, 06:52 AM   #416
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is the start (and conclusion) an hour earlier tonight?
The online schedule says yes, 9:30 PM ET
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Old 01-11-2014, 06:52 AM   #417
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Quote:
Originally Posted by markjenn View Post
Time will tell, but I think reversed cylinder heads will eventually go the way of 5-valve heads and TRAC anti-dive brake systems - trumpeted as huge technical advances at introduction, but later found to be neutral at best.

- Mark
Yamaha thought enough of it to tool up to build the 2014 250 that way. And while the Honda isn't rear exhaust when you look at the engine it certainly has a rear slanted look to it as it sets in the frame.

When the Rokon had disc brakes everyone thought those were a joke, but the pull starter never caught on...

2013 Honda 250

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Old 01-11-2014, 07:14 AM   #418
TooFast
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In the Meantime

Turn right, go left:

Cycle World has teamed with AMA Pro Racing

and RPM Racing to deliver exclusive live streaming video of the 2014 Superprestigio Dirt Track from the Palau Sant Jordi in Barcelona, Spain. Our coverage, on www.cycleworld.com, begins at 9:00 a.m. Pacific Standard Time on Saturday, January 11.
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Old 01-11-2014, 07:18 AM   #419
TooFast
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Honda did some mass centralization but still have a big old bend in the intake tract the charge has to go around - flow resistance and turbulence causation, not optimum

Quote:
Originally Posted by nachtflug View Post
Yamaha thought enough of it to tool up to build the 2014 250 that way. And while the Honda isn't rear exhaust when you look at the engine it certainly has a rear slanted look to it as it sets in the frame.

When the Rokon had disc brakes everyone thought those were a joke, but the pull starter never caught on...

2013 Honda 250


TooFast screwed with this post 01-11-2014 at 08:00 AM
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Old 01-11-2014, 08:45 AM   #420
nachtflug
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Originally Posted by TooFast View Post
Honda did some mass centralization but still have a big old bend in the intake tract the charge has to go around - flow resistance and turbulence causation, not optimum
wouldn't it be safe to assume that someone as technically capable as Honda know what they've got with that engine and would have tried different intake layouts before mounting the engine in the frame? maybe a straight intake tract wasn't optimal for the power they wanted? I can't think they'd want MX riders dealing with crazy high RPM's, the 250 riders are basically pinned all the time as it is, and the 450/250 lap times at the pro level of SX would tend to back up the fact that the lower rpm 450's and the higher RPM 250's run pretty similar lap times with the top riders from each class. yes the 450's have the power advantage but I'd think in something like SX that could be a pro and a con.
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