Cross plane crank

[carson]

What the fuck is a cross plane crank engine . New R1 ?

[pappas]

http://www.ashonbikes.com/cross-plane_crank

[stu]

Go here:
http://www.yamaha-motor-europe.com/designcafe/en/about_design/Technology/?Component=tcm:71-308391&PageTitle=Yamaha%20Technology%202009:%20Crossplane %20crankshaft

[fimpBIKES]

its a v-twin for inline-4 people....

[Hagarr]

Theres some clever and knowledgeable people replying in that thread!

Interesting comments in regard to the Michelin Techs saying that Rubber is too flexible for the pulses to have any effect either big bang or Twin or WHY.

[grindella]

finally, aircraft technology in bikesm how long before it gets into cars?

[DaveK5]

Don't get too excited fellas...this is old technology revisited.

[pappas]

quote:Originally posted by grindella

finally, aircraft technology in bikesm how long before it gets into cars?


Most V8's have cross plane cranks.

[Weaselman]

yup hes right there.

bring back oval pistons

[grindella]

I always thought that an "in line motor" was not a "V". Am I wrong? or has the R-1 now got a V4?

[fimpBIKES]

pretty much

[pappas]

It's still an inline motor but the crankpins are offset at 90 degrees rather than 180 degrees. So it has the same characteristics as a V4.

[grindella]

my point being is that it is an inline 4, but the crank is the same as those used in aircraft. It may have same power chatacteristics as a V but it is not a V. So taking that into account which other inline motors including cars have the same crank configuration as the new R-1 motor?

[DaveK5]

Dude start here,
en.wikipedia.org/wiki/Crossplane

these guys are talking about Mercs
www.ten-tenths.com/forum/showthread.php?t=92128

And this is for the kiddies who still don't understand.
http://www.autozine.org/technical_school/engine/smooth4.htm

[pappas]

quote:Originally posted by grindella

my point being is that it is an inline 4, but the crank is the same as those used in aircraft. It may have same power chatacteristics as a V but it is not a V. So taking that into account which other inline motors including cars have the same crank configuration as the new R-1 motor?


Are you reffering to the split crankpin design or just the cross plane crank shaft? I don't know much about plane engines but an in line 8 cylinder has a crossplane crank and has been used in cars since the early 1900's

[grindella]

was not aware the inline 8's were cross plane, my point was cross plane fours. Are there many of those out there?

[pappas]

I'm pretty sure Yamaha is the first to mass produce a cross plane 4 cylinder. Someone else may know better than me though!

[grindella]

I am 99% sure yamaha is first bike to try it. But it makes sense that a straight 8 has it as one cylinder would fire every 90 degrees over 720 degrees (720 deg being 2 revolution or one firing of a four stroke motor). Now I am curious as to how yamaha has configured their firing order. I guess it may be like coupling to duc motors.

[old gsxrr]

on v8's they gett better exhaust tuning power as your typical v8 will fire 2 cyl on one side
rather than alternating from one side to the other, they sound like a 6 cyl and they don't like heavy pistons - and usually used with short stroke i was going to build one as a test about 6 years ago -my engine building businesss

[Nudie]

All of this techanojical wizadry and it's still just a fuckin Yamaha!

What's that old saying about silk purses and pigs scrotums?

[grindella]

yep silk purses and pigs scrotums , all bikes that start with "H" , harley, hodaka, honda, etc