Yamaha YZR-M1 — Motorcyclist Magazine

5 Апр 2015 | Author: | Комментарии к записи Yamaha YZR-M1 — Motorcyclist Magazine отключены
Yamaha YZR M1 Concept

The Prince And The Pauper

If you take the of each of this month’s bikes and divide by their you get around 101 bhp per liter for the Star and about 120 for the Suzuki B-King. (and torque) per liter are measures when comparing machines. I’ve recently had to compare these figures on of the most wildly dissimilar in existence, and it’s been

The prince in this story is the YZR-M1 MotoGP bike. At the end of the race season, Masahiko Yamaha’s MotoGP group offered an unusually candid comparison of the ’07 and ’08 He didn’t reveal peak but it’s clear from top and other indications that machines are making about 240

So a competitive 800cc MotoGP is making in the neighborhood of 300 bhp per liter.

The surprising disclosure was the extent of from ’07 to ’08. was up by 12 percent and fuel efficiency by 6 To put that in perspective, a 12 percent each year would the power in seven years!

unlikely that such are possible every year, so the is really impressive.

Two power-increasing stand out in Yamaha’s development. the valve train components lightened by a dramatic 40 percent, both increased revs and frictional losses due to the lessening of valve spring pressure. notable reduction in internal was made possible by a center-oiled Such a crank can exist on low oil pressure because the oil is flung resulting in higher pressure at the than at the supply end.

Power saved pumping oil is added at the rear wheel.

In development of the ’08 M1, Yamaha were goaded by the (relative) of the ’07 bike. Their was rewarded by Valentino Rossi the ’08 world championship. For the competition is under pressure to their bikes to the top. Can achieve power gains on the of 10 to 12 percent?

I wouldn’t bet on it, but they’ll be

If the prince of this piece an astonishing 300 bhp per liter, the pauper out a mere 44. The current Royal 500 is an air-cooled, two-valve, pushrod that makes 22 bhp at 5400 These bikes are almost from when they first produced in India in but their design goes further than that.

are truly a piece of history-a of sepia photograph of an earlier

But I got a bit of a shock when I found the ’08 Harley-Davidson Cross Motorcyclist recently tested makes 44 bhp per liter. Mirroring the its 70-bhp, 1584cc V-twin is an air-cooled, two-valve, pushrod Its power peaks just 200 below the Enfield’s at 5200

Harley’s engineers have the Twin Cam motor with and fuel injection; surely can give it more power per than the Enfield? Maybe Let’s look at their The fact that these are air-cooled is certainly a factor, but are air-cooled BMWs, Buells and that make about 85 bhp per

The fact that they use two per cylinder also is a factor, but look at the two-valve Buells and

The biggest limiting factor is rpm. Neither the Enfield nor the wants to be revved much its 5000-plus-rpm limit. Big singles counterbalancers, and big, narrow-angle (even with balancers) are not machines. It’s easier these engines to use their at low revs to make them

At 5000 rpm, pushrod trains are happy and two valves can the flow. Would these make a lot more power overhead cams and four per cylinder? The example of the Victory tested alongside the Harley the Victory making 46 bhp per liter its more sophisticated valve and intakes-only a 4 percent benefit.

The with 300 bhp per liter and the ’08 world championship under its is obviously a successful motorcycle in of performance. But don’t laugh at the getting by on 44 bhp per liter. Success can be defined in terms of a long history like the Enfield’s-or by an sales history like

Yamaha YZR M1 Concept
Yamaha YZR M1 Concept
Yamaha YZR M1 Concept
Yamaha YZR M1 Concept

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