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New Yamaha fuel tank.

#22

Joined Oct 2008
6K Posts | 5K+
In Cider
Interesting article about the relocation of the M1 filler neck.

Aside from MotoGP's switch to Michelin tyres, the biggest visual change on the 2016 Yamaha is a new fuel tank accessed from the rear of the bike.

So instead of having the fuel filler system located in front of the rider, it is now behind the seat.

We don't know the exact shape of the new Yamaha tank, but the majority of fuel is usually stored directly under the seat (see examples below). All other manufacturers still have the filler in front of the rider.

Katsuyuki Nakasuga gave the revised Yamaha tank its public debut as a wild-card in October's Japanese round (pictured), qualifying 15th and finishing the wet race in eighth place.

However eventual champion Jorge Lorenzo and Movistar Yamaha team-mate Valentino Rossi had already tested the bike in private at Aragon in September, then again at Valencia last month.

"The 2016 machine we tried in Aragon is the bike that's adapted to the Michelin tyres to get the best performance. The fuel tank is on the back, behind the seat, before it was in front of the rider," Lorenzo confirmed at Valencia.

While Bridgestone was renowned for the grip generated by its front tyre, it is the Michelin rear that dominates. Most believe weight distribution will be moved forward to compensate, so is that the reason for the new tank design?

“It is a different grip balance [with the Michelins], but we also have two litres more fuel for next year so we need to create volume. Find more room,” Lorenzo's team manager Wilco Zeelenberg told Crash.net.

While the Yamaha and Honda factory entries have been restricted to 20 litres in recent seasons, this is increasing to 22 litres - for all competitors - due to the thirstier single ECU system.

“It's not completely [decided] if we will use this tank set-up yet. We know we have two litres more fuel to put somewhere so this idea was created and we are trying it,” Zeelenberg continued.

“Basically we can go everywhere [with the two litres of extra fuel] but you cannot go a lot more forward because you have the airbox. And if you make the airbox smaller, that would be a problem!”

The Dutchman confirmed that the tank also allows the factory to try some new set-up options, as Yamaha seeks to perfect weight and geometry for the 2016 tyres.

Nakasuga's Yamaha, 2015 Japanese MotoGP
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Honda fuel tank, 2015 German MotoGP
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Ducati fuel tank, 2014 Sepang Test
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Yamaha fuel tanks, 2013 Dutch TT
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Some nice ally bending and welds on those.
Mass centralisation. And Airbox integration
 
Have to be honest here and say that I love photos like this that show the basic design of a component of the bike as when they are stripped, so many of the parts are artistic in the way that they are constructed. Is brilliant to see the work that goes into them
 
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this just really confuses me...

i wish i knew more about bikes.

The point is that you have a genuine interest and passion about it which comes across and you can't fake. And, since you don't have an ounce of pretence about you or try to blag it, it's actually very refreshing given the 'experts' that have overrun this forum over the last month.

Anyway, you'll learn so much when you get your own mount.
 
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this would add weight to the rear of the bike, though the new tires are said to have more grip in the rear tire... I would think that they would do just the opposite, add weight to the tire with less grip. Over the corse of the race there would be less weight in the rear as more fuel is used.
 
I guess that makes some sense. I just never rode a bike, so I would think the fuel sloshing around would be weird. But like I said I don't ride.

I was wondering if it would make the rear feel different. Also, what would the space where the gas tank usually be use for then? Seems like it would be unused space?

Just curious.
 
Probably just a cowling or air box cover. Quite a few bikes used to have the tanks lower in the chassis.

I don't know but would imagine the tanks have baffles to slow the fuel down so it doesn't slosh as much.
 
I guess that makes some sense. I just never rode a bike, so I would think the fuel sloshing around would be weird. But like I said I don't ride.

I was wondering if it would make the rear feel different. Also, what would the space where the gas tank usually be use for then? Seems like it would be unused space?

Just curious.
The unused space is used for the Airbox. The bigger the better.
The fuel tanks will be baffled, in fact so confused that the fuel won't slosh too much.
The aim of these tanks is to put the fuel as close to the bike/rider CoG as possible, so as the fuel is used, the CoG of the bike is minimally affected.

Edit: Lowegian beat me to it.
 
The unused space is used for the Airbox. The bigger the better.
The fuel tanks will be baffled, in fact so confused that the fuel won't slosh too much.
The aim of these tanks is to put the fuel as close to the bike/rider CoG as possible, so as the fuel is used, the CoG of the bike is minimally affected.

Edit: Lowegian beat me to it.


Yep, makes it much more agile: easier to change direction, which is quite handy I'm told. The torque required to rotate it is reduced but also the tendency to kind of seesaw back and forth is eliminated (or reduced anyway) so you can imaging the feel would be improved as well. Makes it more stable when braking aggressively - the tendency for the back end to pendulum back and forth would be reduced - and also more stable when you get on the gas: less wallow if the back steps out.
 
this just really confuses me...

i wish i knew more about bikes.
The engineers are trying to distribute the weight to effect a desired balance. Given the new electronics and tires, perhaps the engineers are trying to exploit or mitigate some effect. Often the conventional seating of the fuel 'cell' isn't even where we might intuitively think, as the 'gas tank' often is just a compartment where they house a bunch of other .... (airbox, wires, sensors, etc). The actual fuel often is well below the 'tank' (to keep center of gravity low, I'm told). Frankly I don't know either why they'd want fuel to be carried over the rear, since the consumption of fuel would dramatically effect the handling over time, one would think. But then again that's why I had to take algebra in college 3 times. Anyway Sparrows, very few of us know any more than you. Really.


Edit: well at least with few exceptions, we do after all have dentist / architects who crew chief on spare time. (Or is it crew chiefs who practice dentistry / architecture?) Anyway, I'm off to do a bit of Internet psychological analysis. [Gets on scooter] Hey, Dr. Medes, hold up....
 
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The great thing about all the major changes (Fuel amount, tires, ECU) is that is forcing teams to make a lot of changes.

This is going to make season very, very, interesting. I cant wait for testing to start again. Heck, this will be the most exciting testes I think we will ever see. Is it next season yet?
 
The great thing about all the major changes (Fuel amount, tires, ECU) is that is forcing teams to make a lot of changes.

This is going to make season very, very, interesting. I cant wait for testing to start again. Heck, this will be the most exciting testes I think we will ever see. Is it next season yet?

Testes also make Willski excited.

Speaking of testes, and other sacks that hold fluids, Sparrow, oftentimes the fuel cap leads to a conduit to the tank. And sometimes to a secret fuel sack to be used when the occasion calls, particularly the 2007 Ducati, right J4rn0?
 
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Man, those fuel tanks look HUGE! Any idea how many gallons they hold? The current regulation is 22 liters (5.82 gal), so doubt they're much larger than that. But they look like 7. Maybe the fuel pump(s) eat a lot of space. But some very interesting shapes. And no freaking plastic there:D.
 
All the new Yamaha dirtbikes have tanks under the seats now too, I wonder if Yami had tried that whole "reversed engine" Idea out in their GP bikes at all, since this concept seems to be inspired by the dirtbike as well.
 
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All the new Yamaha dirtbikes have tanks under the seats now too, I wonder if Yami had tried that whole "reversed engine" Idea out in their GP bikes at all, since this concept seems to be inspired by the dirtbike as well.
I wonder if Rossi will like the new tank. It should feature nicely when we are subjected to the manditory pick-my-... camera shot. :middle finger:
 

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