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Yamaha Crossplane Triple Concept

Crossplane 3 cylinder? There's basically only one way to build a thee cylinder crankshaft. Yamaha is basically going to build a Triumph. Still wouldn't stop me from buying a Japanese triple. Calling it crossplane is just marketing.


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Dickdaney said:
Crossplane 3 cylinder? There's basically only one way to build a thee cylinder crankshaft. Yamaha is basically going to build a Triumph. Still wouldn't stop me from buying a Japanese triple. Calling it crossplane is just marketing.


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if the counterweight is set in place of the 4th cylinder at 90* it could theoretically be called a crossplane vs a cbr crankshaft with 180* phase between pistons. Realistically its like having cylinder 1 and 4 on one piston. If that makes any sense.
But yeah its basically going to be just like a triumph crankshaft.
 
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Yes, that is just a marketing gimmick! Triumph Triples already have crossplane crankshaft necessitated by the triple cylinder design. The same reason why Triumphs don't need a slipper clutch either..
 
CrazyBiker said:
Yes, that is just a marketing gimmick! Triumph Triples already have crossplane crankshaft necessitated by the triple cylinder design. The same reason why Triumphs don't need a slipper clutch either..
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Along with every other triple crankshaft ever produced. Including Yamaha's SRX 700.
SrxCrankshaft.jpg
 
Isn't the crossplane R1 also beneficial because of the firing order also? I don't know much about this stuff :)
 
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View attachment 12213

Here's a standard 3 cylinder crankshaft. The crankshaft is designed so that the cylinder a fire at 0-240-480. It takes 1.3 revolutions of the crankshaft to fire every cylinder.

A flatplane inline 4 fires at 0-180-360-540. It takes two revolutions of the crank to fire all four cylinders.

The crossplane crank has a firing order of 270-180-90-180. It takes 1 revolution of the crankshaft to fire every cylinder


My point is, crankshafts have been around for a long long time. Yamaha didn't invent anything when they put the crossplane crank in the M1/R1. They just took proven American V8 technology and cut the number of crank pins and cylinders in half. It's highly doubtfully hat they are designing something new from the ground up in the 3 cylinder technology. They're just taking a standard triple and rebranding it as "crossplane" to drive M1/R1 lovers to buy more bikes.


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Dustin said:
Isn't the crossplane R1 also beneficial because of the firing order also? I don't know much about this stuff :)
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It's beneficial above 15,000 rpm. Below that it just sounds cool. I love the sound of my buddies R1. Sounds like a mustang on speed. Below is an article that explains the crossplane motor at the motogp level

http://superbikeplanet.com/2007/Dec/071217b.htm



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Every 4 stroke motor takes 720 degrees of crank rotation to fire all of the cylinders. The only exception to this rule I know of is a rotary. It all comes down to suck, squish, bang, blow, repeat.

Andy
 
Dickdaney said:
View attachment 12213

Here's a standard 3 cylinder crankshaft. The crankshaft is designed so that the cylinder a fire at 0-240-480. It takes 1.3 revolutions of the crankshaft to fire every cylinder.

A flatplane inline 4 fires at 0-180-360-540. It takes two revolutions of the crank to fire all four cylinders.

The crossplane crank has a firing order of 270-180-90-180. It takes 1 revolution of the crankshaft to fire every cylinder


My point is, crankshafts have been around for a long long time. Yamaha didn't invent anything when they put the crossplane crank in the M1/R1. They just took proven American V8 technology and cut the number of crank pins and cylinders in half. It's highly doubtfully hat they are designing something new from the ground up in the 3 cylinder technology. They're just taking a standard triple and rebranding it as "crossplane" to drive M1/R1 lovers to buy more bikes.


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Ok so I was wrong about it being every crankshaft. But it is on the srx shaft. Doesnt matter the firing order there because its a 2 stroker and has wasted spark
 
I ride a Triumph Daytona 675 tripple on the track and I will tell you a slipper clutch is required, unless you are a good enough rider to always match trransmission speed with wheel speed on the down shift. It will behave just like an inline four or a twin and become very unsettled.
 
Yamaha is seriously missing out on a 250 (or 300 class now) mini-R6. Think of all the people they could attract to their brand who would sell their Ninja 250 and upgrade to an R6 anyway!
 
Dustin said:
Yamaha 3 Cylinder Crossplane Concept Engine

That would be a hell of a motor. Yes please!
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Yamaha already has a 1050cc triple......it is in their Nytro snowmobile and is a great motor.
In fact on that motor you can get from Yamaha either a MC express super charger of turbo to bump the power to the 225hp range.
About time is shows up in a bike.
 
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