Crankshaft Question

[MNC5]

Does the Rocket 3 use Triumphs 120 degree crank or the T Plane 90 degree crankshaft. Or is there another variation

 

[R-III-R Turbo]

Looks like a simple 120° to me

 

[MNC5]

Looks like a simple 120° to me

Thanks, Can I ask what your plans are having that apart

 

[R-III-R Turbo]

Not my pic, robbed from Triumph tech training. Although I would like to get my hands on a 2458cc Rocket 3 so I could stroke it...

 

[Idaho Red Rocket 3]

It is my understanding the little 2.3 L engines are 120 degree and the big 2.5 L engines are T Plane.

 

[R-III-R Turbo]

It is my understanding the little 2.3 L engines are 120 degree and the big 2.5 L engines are T Plane.

Curious to know where this came from.

Apparently a Triumph T plane is the same as a cross (X) plane 4 cylinder crank except missing one of the crankpins.
So looking at it from the end it looks like a T, say cylinder #1 crankpin is at 12 o'clock, cylinder #3 will be at 6 o'clock and cylinder #2 will be at 3 or 9 o'clock.
See the illustration on the top right here;

The only images I have of the 2458cc Rocket 3 (two below) look really like 120° angles between crankpins.

Just like the old 2.3L Rocket III crank;

 

[atomsplitter]

The Triumph web site showss the Tiger cranks are T-plane but nothing on the Rocket about it.

 

[MNC5]

It looks to be 120 degree spacing but I'll ask a local Triumph shop to confirm. Unless someone has definitive information to share

 

[R-III-R Turbo]

It is my understanding the little 2.3 L engines are 120 degree and the big 2.5 L engines are T Plane.

Curious to know where this came from.

@Idaho Red Rocket 3 ?

 

[vsteel]

I am pretty sure they are 120 degree, they are too smooth for T plane. They also don't sound like a T plane, the offset firing order has a V8 sound to it, sort of.

The T plane also came out after the rocket was designed, the T plane is a pretty recent edition to the lineup.