Yamaha to Get Pneumatic Valves

What will Honda do, I wonder?

This is good news for Yamaha, they seem to really be getting their act together now! I think Honda will respond with a new engine also.

I know this is way off track but what the hell is wrong with Loris Cappa this season!!!!! Sorry i just had to get it of my chest

<div class='quotetop'>QUOTE (Morgo @ Jul 7 2007, 01:41 AM) <{POST_SNAPBACK}><div class='quotemain'>I know this is way off track but what the hell is wrong with Loris Cappa this season!!!!! Sorry i just had to get it of my chest

Try to concentrate for a race changing dippers, crying for milk and wife nagging about baby’s temperature going up! Just joking… Where the hell is he?

Ha Ha Ha Ha Ha nice

like it said top speed is all thats wrong with the bike other than that yamaha and ducati are equal.

michelin need to improve in the wet but we've had more than a seasons worth of wet races already so we'll there be any more?

I dont know if you guys know this or not, but Stoner and Loris are on completely different bikes. their engines are no where near the same. And pneumatic valves did not work for Aprillia so I am interested to see what Yamaha can do with them.

I am not saying Ducati shafted Loris. Loris just chose the wrong engine in the pre-season, and Stoner got it right. VERY RIGHT

<div class='quotetop'>QUOTE (Eagle088 @ Jul 7 2007, 11:45 PM) <{POST_SNAPBACK}><div class='quotemain'>I dont know if you guys know this or not, but Stoner and Loris are on completely different bikes.

Where did you get this information? i was under the impression they had the same bike until ducati bought the new electronic engine stuff to try to help Loris a few races back, but now hes back to the standard kit because it didn't work.

<div class='quotetop'>QUOTE (Eagle088 @ Jul 7 2007, 11:45 PM) <{POST_SNAPBACK}><div class='quotemain'>And pneumatic valves did not work for Aprillia so I am interested to see what Yamaha can do with them.

Kawasaki are enjoying them

<div class='quotetop'>QUOTE (Tom @ Jul 7 2007, 06:42 PM) <{POST_SNAPBACK}><div class='quotemain'>Where did you get this information? i was under the impression they had the same bike until ducati bought the new electronic engine stuff to try to help Loris a few races back, but now hes back to the standard kit because it didn't work.
Kawasaki are enjoying them


Stoner is on an engine called a "screamer" engine. This engine has a firing order that never has two cylinders hitting at the same time. Loris is on a "big bang" engine that acts more like a V type of power delivery. The big bang engine is easier to get more out of, that is the power is easier to deliver to the ground and is found throughout the rpm range. Stoner's "screamer" engine is much harder to ride but delivers more peak power. The problem is with the delivery, becuase the delivery is more 250 or 500 style and is very harsh. The power is mostly made real high in the rpm range so in order to get the power out, you have to keep it at high revs all the time. This also could create a fuel shortage problem. But I guess, Ducati has a great data tech and they have obviously figured out how to get this bike to work for Casey.

I get my information from people I know that are close to the GP scene. Its nice to have friends in high places, but I would like to keep my friends so I would rather not say anymore about them. This is not a big secret type of thing but there could be consequences. I am sure you understand and I thank you for your discretion.

Eagle is loris!

<div class='quotetop'>QUOTE (Eagle088 @ Jul 8 2007, 04:16 AM) <{POST_SNAPBACK}><div class='quotemain'>Stoner is on an engine called a "screamer" engine. This engine has a firing order that never has two cylinders hitting at the same time. Loris is on a "big bang" engine that acts more like a V type of power delivery. The big bang engine is easier to get more out of, that is the power is easier to deliver to the ground and is found throughout the rpm range. Stoner's "screamer" engine is much harder to ride but delivers more peak power. The problem is with the delivery, becuase the delivery is more 250 or 500 style and is very harsh. The power is mostly made real high in the rpm range so in order to get the power out, you have to keep it at high revs all the time. This also could create a fuel shortage problem. But I guess, Ducati has a great data tech and they have obviously figured out how to get this bike to work for Casey.

I get my information from people I know that are close to the GP scene. Its nice to have friends in high places, but I would like to keep my friends so I would rather not say anymore about them. This is not a big secret type of thing but there could be consequences. I am sure you understand and I thank you for your discretion.

what was the new engine that Capirossi used since Mugello then that Stoner was also offered but turned down for that race.

<div class='quotetop'>QUOTE (Valentino Is God @ Jul 8 2007, 04:56 PM) <{POST_SNAPBACK}><div class='quotemain'>what was the new engine that Capirossi used since Mugello then that Stoner was also offered but turned down for that race.

I think thats what hes talking about, Loris was given a big bang type engine for Mugello, but i have heard he's back with the one Stoner has because it wasn't the solution he had hoped for.

just encase anybody wondered,

If you've been following technical developements in MotoGP for a while, you've certainly heard about the "big bang" engines. The "big bang" concept - which is basically a change in the firing interval of the cylinders - was originally developed back in the days of 500cc two-stroke GP bikes, and has recently been applied by both Yamaha and Kawasaki on their inline-four MotoGP engines.

A standard inline-four fires its cylinders at regular intervals - one cylinder every 180 degrees of crank rotation. This creates a constant delivery of power to the rear wheel, which can make it difficult to maintain rear-tire traction, or to regain said traction once it has been lost via wheelspin. Since this effect becomes more pronounced as power output increases, it is especially noticeable in current Superbikes (many putting out 200+ horsepower) and MotoGP bikes (220-250 horsepower).

Years ago, Superbike racers discovered that it was easier to modulate the power to prevent wheelspin on the Ducati V-twins than it was to do the same on the Japanese inline-fours. This is because there is a longer interval (in terms of both time and crankshaft rotation) between cylinders firing, which gives the rear tire a "break" - time to recover traction and match its speed to that of the motorcycle.

The "big bang" engine attempts to transfer this characteristic to the inline-four by changing the firing intervals of the cylinders. By firing two cylinders close together, followed by a long break, then the other two cylinders in close succession, then another long break before the cycle begins, a "big bang" motor gives the tire some recovery time. This gives enormous benefits to rideability and tire wear.

The disadvantage is that these uneven firing intervals throw off the balance of the motor, creating excess vibration that can be damaging to the bike and annoying to the rider. The life span of the motor's internal components is also affected, since there are now effectively two large power pulses per power cycle instead of four smaller ones. To get an idea of how this will affect the durability of the motor, just walk over to the nearest glass window and knock on it lightly four times. Now knock on it twice as hard, two times. See what I mean?

These negative affects can be counteracted, however. Stronger internals will resist the bigger power pulses, and a balance shaft can dampen the excessive vibrations - although balance shafts create parasitic losses that sap horsepower.

Recently we have seen reports that Virgin Yamaha is using a "big bang" firing order on its Yamaha R1 race bikes in the British Superbike Championship. This is the first we've heard of the "big bang" in a road-based bike, rather than the pure racing prototypes of MotoGP. Hearing about the Virgin R1, we started to wonder if the "big bang" design will ever make it into a production inline-four streetbike.

As the power output of modern 1000cc sportbikes climbs to ever more ridiculous heights, rideability will start to become the deciding factor for many potential buyers (hopefully it already is!). If a production inline-four 1000cc from one of the Japanese "big four" were to be redesigned to utilize the "big bang" firing order, it could dominate the category by allowing more of its excessive power to be safely used on the streets.

Our bet on which manufacturer will be first to debut a "big bang" streetbike lies with Yamaha. They have a tradition of thinking outside the box (a 400cc four-stroke motocross bike!), and they have already been using the "big bang" design since last season in MotoGP. Seeing a private race team like Virgin Yamaha using it in an R1 might be just the inspiration Yamaha's engineers need!

link

Loris Capirossi has demanded his Ducati team to help him in order to bounce back from his disappointing start to the 2007 season.

The veteran rider has struggled to be competitive so far this year, having climbed onto the podium just once in five races.

In contrast, teammate Casey Stoner has scored three wins and is leading the championship with 102 points. Capirossi has scored 38 and is seventh in the standings.

The Italian, who last year scored three wins on his way to third place in the standings, has been struggling to adapt his riding style to the GP7 bike, and he reckons Ducati must now focus on helping him get out of his difficult situation.

"The beginning has been difficult," Capirossi was quoted as saying by Gazzetta dello Sport. "The bike is a winner, but I haven't been able to get the results I was hoping for. I'm struggling, I'm not riding well. I must change my style, but Ducati must help me too.

"I've always given it all, even when things weren't going right. Now that it's me needing a hand, I demand some help. I developed the bike from zero and I won races. If the Ducati has reached the level it has, it's also thanks to me."

Although the bike was developed mainly by Capirossi, the Italian reckons too many changes were made since then.

"When we discussed the project with (Ducati's technical director Filippo ) Preziosi, we concluded that with the aid of electronics we could gamble on a screamer engine," he added.

"At the beginning I felt good on the 800cc, I was quick. After that, a lot of parameters were modified, especially on fuel consumption: this GP7 has nothing to do with the one from back then."

He added: "Casey corners more sharply, which allows him to get on the power with the bike almost upright. My speed in turns is a lot higher, even 15 km/h on fast corners, but at turn-exit Stoner launches on the straight like a bullet. It's easy to say but difficult to do.

"If there are two riders, they must both be competitive. It's totally wrong to think that with Stoner winning it's fine as it is."

The 34-year-old, a three-time champion in other categories, says his lack of pace has nothing to do with his motivation, and he claims he remains as committed as ever.

"No way, there's no relaxation," he said. "At Le Mans I was among the fastest in the first and second sectors, the one with the quick sweeping corners. If one slows down, he does it in the quick sectors, not in the slow ones.

"It's understandable that looking from the outside, with Stoner winning, one might think I'm over the hill, but I'm not. I'm a brave rider, I don't shy away, I've never whinged, I've never looked for excuses.

"Now I'm asking for some help and I won't quit racing until I get back to winning ways."
link

As said above the Ducatis use the screamer configuration. Live at the track it's very easy to hear. On power the ducatis have a very distinct, much sharper sound than the others, that use som kind of variation of big bang. Capirossi may have tried a bigbang but he sure didn't use that one at Assen.

I hope they don't go to big bang engines on street bikes. I'm sure it's good for grip out of corners, but the way I ride on the street it really doesn't matter. I just hate the sound of big bang engines (and V-twins).

<div class='quotetop'>QUOTE (roger-m @ Jul 8 2007, 05:54 PM) <{POST_SNAPBACK}><div class='quotemain'>Loris Capirossi has demanded his Ducati team to help him in order to bounce back from his disappointing start to the 2007 season.

The veteran rider has struggled to be competitive so far this year, having climbed onto the podium just once in five races.

In contrast, teammate Casey Stoner has scored three wins and is leading the championship with 102 points. Capirossi has scored 38 and is seventh in the standings.

The Italian, who last year scored three wins on his way to third place in the standings, has been struggling to adapt his riding style to the GP7 bike, and he reckons Ducati must now focus on helping him get out of his difficult situation.

"The beginning has been difficult," Capirossi was quoted as saying by Gazzetta dello Sport. "The bike is a winner, but I haven't been able to get the results I was hoping for. I'm struggling, I'm not riding well. I must change my style, but Ducati must help me too.

"I've always given it all, even when things weren't going right. Now that it's me needing a hand, I demand some help. I developed the bike from zero and I won races. If the Ducati has reached the level it has, it's also thanks to me."

Although the bike was developed mainly by Capirossi, the Italian reckons too many changes were made since then.

"When we discussed the project with (Ducati's technical director Filippo ) Preziosi, we concluded that with the aid of electronics we could gamble on a screamer engine," he added.

"At the beginning I felt good on the 800cc, I was quick. After that, a lot of parameters were modified, especially on fuel consumption: this GP7 has nothing to do with the one from back then."

He added: "Casey corners more sharply, which allows him to get on the power with the bike almost upright. My speed in turns is a lot higher, even 15 km/h on fast corners, but at turn-exit Stoner launches on the straight like a bullet. It's easy to say but difficult to do.

"If there are two riders, they must both be competitive. It's totally wrong to think that with Stoner winning it's fine as it is."

The 34-year-old, a three-time champion in other categories, says his lack of pace has nothing to do with his motivation, and he claims he remains as committed as ever.

"No way, there's no relaxation," he said. "At Le Mans I was among the fastest in the first and second sectors, the one with the quick sweeping corners. If one slows down, he does it in the quick sectors, not in the slow ones.

"It's understandable that looking from the outside, with Stoner winning, one might think I'm over the hill, but I'm not. I'm a brave rider, I don't shy away, I've never whinged, I've never looked for excuses.

"Now I'm asking for some help and I won't quit racing until I get back to winning ways."
link


It`s so nice to hear Cappa fighting back.

You here it on here and on other threads about the guys commitment and where he is in the championship and whats happening to him this year.

Fair enough he has a family now and that must distract him from the racing but the guy is still a great racer and i feel still gives 100%.

At donny he was climbing the field and at Assen he was doing well until his bike went tech.

I aggree that the success of this years gp7 and last years gp6 has got something to do with him , he has been there from the beginning and it will be a shame if Ducati let him go.

If Sete had not had taken him off in Catalunya last year then he would have been right up there fighting for 1st place.

Vale won and Nicky finished second. If he could have taken points off them in that race then who knows!!

He still managed to finish in 3rd with only 23 points behind Nicky.

the guy still gets my vote and i hope to see him on a competetive bike next season

<div class='quotetop'>QUOTE (Fred00 @ Jul 8 2007, 08:14 PM) <{POST_SNAPBACK}><div class='quotemain'>I hope they don't go to big bang engines on street bikes. I'm sure it's good for grip out of corners, but the way I ride on the street it really doesn't matter. I just hate the sound of big bang engines (and V-twins).
i think you will find most street bikes use the big bang config 180 crank as opposed to the 120 screamer, most screamer configs have a fireing order remap switch so the rider can adjust during the race.