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Old Dec 4th 2017, 11:50 PM   #31
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Originally Posted by Halo2 View Post
Obviously didn’t read the link, the only ducati in MotoGP recently to win the championship GP7 was a screamer engine.
I did, and can mention that the author of that article has zero clue about engine harmonics and how they affect the output speed of the crankshaft in each cycle (that's per 720 degrees rotation).
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Old Dec 5th 2017, 05:26 AM   #32
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I thought the big bang(2-2-0-0-2-2-0-0) and the screamer (1-1-1-1-1-1-1-1)were 2-strokes? have teams in Motogp been referring to their four stroke engine configurations as big bang and screamer? the ducati v4 will be a twin pulse if they make it like the desmosidici did 90˚+200˚+90˚+340˚ right?

Are you guys saying the V4R will have a 180˚-115˚-180˚-245˚ order and call it a screamer ?

that is the same as the ape BTW

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Old Dec 5th 2017, 06:37 AM   #33
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Originally Posted by Macattack View Post
I thought the big bang(2-2-0-0-2-2-0-0) and the screamer (1-1-1-1-1-1-1-1)were 2-strokes? have teams in Motogp been referring to their four stroke engine configurations as big bang and screamer? the ducati v4 will be a twin pulse if they make it like the desmosidici did 90˚+200˚+90˚+340˚ right?

Are you guys saying the V4R will have a 180˚-115˚-180˚-245˚ order and call it a screamer ?

that is the same as the ape BTW
Screamer is referring to equal spacing between ignition pulses. In a 4 cylinder engine, that means all 4 pistons will be stationary simulaneously (2 at TDC, 2 at BDC), sapping rotational energy from the crankshaft to be accelerated. That means the rotational speed of the crankshaft is anything but smooth. In a 90 degree V with a shared journal (as Ducati has on both the new V4 and the old twins), one piston will be at Vmax while the other is stationary, making the rotational speed (and power delivery) very smooth.
The 70 degree offset in the new V4 refers to the journal spacing, meaning each V is separated by 70 degrees of crankshaft rotation.But each V has a shared journal.
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Old Dec 5th 2017, 11:35 AM   #34
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Turbolag. Could you describe what Yamaha have done to the R1 engine ? I know impulses are not evenly spaced, but that’s about it.
Thx
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Old Dec 5th 2017, 12:04 PM   #35
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Simple version is they made a "virtual" conventional odd fire V4 engine in an inline form.
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Old Dec 5th 2017, 06:54 PM   #36
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Originally Posted by Veteran View Post
Turbolag. Could you describe what Yamaha have done to the R1 engine ? I know impulses are not evenly spaced, but that’s about it.
Thx
Yamaha has switched to a cross-plane crankshaft-the pistons move separate from each other. The typical Japanese inline 4 is a flat-plane crankshaft-the outside pistons move together and the inside pistons move together 180 degrees opposite from the outside pistons. A google search will get you all the info you need on this.
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Old Dec 6th 2017, 12:27 AM   #37
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Now I'm at a computer, so it's easier to write more

A prescise version of what Yamaha has done compared to a conventional I4 is that they have "twisted" the crankshaft 90 degrees for cylinder 2 and 3. This means that instead of all 4 pistons being stationary every 180 degrees, 2 cylinders will be at Vmax while the 2 others are stationary. This gives the engine a smoother power delivery, at the cost of vibrations to the seat.
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Last edited by TurboLag; Dec 6th 2017 at 12:34 AM.
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Old Dec 6th 2017, 10:05 AM   #38
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So if I understand correctly ,essentially the v4 Ducati will feel similar to my R1.
That’s not a bad thing I guess.
It does vibrate a lot more than my zx but not in a unpleasant way. Actually quite addictive.
I think the word to describe it is “gruff”
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Old Dec 6th 2017, 10:12 AM   #39
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Originally Posted by Veteran View Post
So if I understand correctly ,essentially the v4 Ducati will feel similar to my R1.
That’s not a bad thing I guess.
It does vibrate a lot more than my zx but not in a unpleasant way. Actually quite addictive.
I think the word to describe it is “gruff”
The pull will be very similar, we probably won't feel a difference even though one piston set is skewed by 20 degrees in the V4 compared to the R1. The R1 still has 2 stationary pistons at once (one at BDC, one at TDC) while the V4 Duc only has 1.
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Old Dec 6th 2017, 08:15 PM   #40
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Originally Posted by TurboLag View Post
The pull will be very similar, we probably won't feel a difference even though one piston set is skewed by 20 degrees in the V4 compared to the R1. The R1 still has 2 stationary pistons at once (one at BDC, one at TDC) while the V4 Duc only has 1.


1 stationary piston?

If 2 stationary pistons result in more vibs than 4, does 1 stationary piston end up creating more vibration than 2?
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