Topic: Billet Crankshafts

[gschuld]

Awesome😎

George

[754]

Not to take anything away from these billet cranks, they are AWESOME  pieces of work.
 Will the teeth be cut on a gear shaper  ? Are these cranks all spoken for.... it's out of my comic universe. 
 
 Btw  is the crank nitrided, then finish ground ? It's a pretty tough surface.. on my BMW I pounded out my shells badly and Journals survived... polished them up in the cases. Just wondering, as itt would be a good tough surface on  a stock crank.

[kmb69]

Not to take anything away from these billet cranks, they are AWESOME  pieces of work.
 Will the teeth be cut on a gear shaper  ? Are these cranks all spoken for.... it's out of my comic universe. 
 
 Btw  is the crank nitrided, then finish ground ? It's a pretty tough surface.. on my BMW I pounded out my shells badly and Journals survived... polished them up in the cases. Just wondering, as itt would be a good tough surface on  a stock crank.

Damn Frank, never knew you were a crankshaft expert too! Came through your ancestry?
Primary and HyVo teeth will be cut on a vertical gear shaper. We had to have 8" Pitch diameter gear cutters (LARGE) made for clearance between the crank OD and the shaper spindle.
Yep, they will be Ion Nitrided, then ground and final ballanced. The base material has already been heat treated to 40 Rc.

[754]

Actually I don't know much about them... and the drill pic came off instagram..
 What I was wondering, you cannot nitride a stock 750 crank, right ? As finishing would result in no bearings available ?
 What I know about nitride cranks , had to cut a key way in one for a blower snout.. tough to get through.
 And I had heard that Beemer  airhead cranks  don't get reground.. i think. .
 After hammering out a shell on mine , and being able to just give it a polish I understood a bit more how tough the nitride is.

 So the billets,  are they 4130 or 4340 alloy ? Would be much stronger than stock.. 

[Old Scrambler]

Inquiring minds need to know............are they all spoken for?............early or late Busa, or either?

[kmb69]

Actually I don't know much about them... and the drill pic came off instagram..
 What I was wondering, you cannot nitride a stock 750 crank, right ? As finishing would result in no bearings available ?
 What I know about nitride cranks , had to cut a key way in one for a blower snout.. tough to get through.
 And I had heard that Beemer  airhead cranks  don't get reground.. i think. .
 After hammering out a shell on mine , and being able to just give it a polish I understood a bit more how tough the nitride is.

 So the billets,  are they 4130 or 4340 alloy ? Would be much stronger than stock.. 

These are made from a double melted VAR 4330M. Slightly less nickel than 4340. My crank guy says it's his top choice for tough cranks. People argue this.
This material has high tensile strength, high fatigue strength, improved notch toughness and high resistance to crack propagation.
It's my understanding it also allows a deeper case depth from the nitriding.

Cannot answer your question about nitriding stock cranks.

[kmb69]

Inquiring minds need to know............are they all spoken for?............early or late Busa, or either?

I actually made them all for myself. They are going in a SOHC A, a SOHC K, and a DOHC. Two spares. Lots of people are asking though. We'll see.

Actually designed for the early Hayabusa rods but should work with either. The Hayabusa rods have bushed small ends so pin diameter can be adjusted as desired.

[madmtnmotors]

Nice!

🤤 🤤 🤤

[dragracer]

Inquiring minds need to know............are they all spoken for?............early or late Busa, or either?

I actually made them all for myself. They are going in a SOHC A, a SOHC K, and a DOHC. Two spares. Lots of people are asking though. We'll see.

Now thats being kind of selfish isn't it? 🤣  Just kidding!! Glad you're stepping up to do something like this to keep the spirit of the SOHC legacy alive. The old heads around the world may be the only ones to appreciate what you're trying to achieve and thats okay. Often times we do things to make ourselves happy with no need for validation from others. I'm sure your overall package will result in a record setting SOHC motorcycle. 

[MRieck]

Inquiring minds need to know............are they all spoken for?............early or late Busa, or either?

I actually made them all for myself.

I thought your wife had those made for you as a Christmas present.

[Old Scrambler]

Thanks, Keith............your knowledge is an added Christmas present

[kmb69]

Inquiring minds need to know............are they all spoken for?............early or late Busa, or either?

I actually made them all for myself.

I thought your wife had those made for you as a Christmas present.

Well, HALF of their cost was technically her money!

Mike, EVERY DAY I wake up without a chalk line around me IS Christmas to me!

MERRY CHRISTMAS!

[Tracksnblades1]

Updates…?

🤞😇

[kmb69]

Damn, time flies!
Cranks are finished. Working on cutting the idler and primary gears.
Took a while to get tooling and cutters for idler and primary.
Hope to have machine time opening soon.

Real work that  puts beans on the table keeps getting in the way. 
Damn Customers! 

[bwaller]

What kind of beans? 

[MRieck]

I'd say the ones with decimal points.

[Tracksnblades1]

Damn, time flies!
Cranks are finished. Working on cutting the idler and primary gears.
Took a while to get tooling and cutters for idler and primary.
Hope to have machine time opening soon.

Real work that  puts beans on the table keeps getting in the way. 
Damn Customers! 

It does fly..
Went from 3 grandchildren to 6 already.

Wondering how many bushels of beans im going to have to trade you for a 70mm variant.?😁
Them beans are worth about $17.00 a bushel nowadays 😳

[Jerry Rxman Griffin aka MuthaF'er]

I'd say the ones with decimal points.

But only 1 comma

[Ellz10]

I'd say the ones with decimal points.

But only 1 comma

 

[dragracer]

Damn, time flies!
Cranks are finished. Working on cutting the idler and primary gears.
Took a while to get tooling and cutters for idler and primary.
Hope to have machine time opening soon.

Real work that  puts beans on the table keeps getting in the way. 
Damn Customers! 

Waiting patiently to see this artwork completed but more excited about it being put into an engine and producing big horsepower.

[MRieck]

 Spoke with Marine Crankshaft yesterday.....they are not taking in any crank work for the foreseeable future. Apparently they have a ton of work. Luckily I got my CBX crank in just under the wire.

[gschuld]

What were you asking for at Marine Mike?  Weld up stroker crank?

George

[MRieck]

What were you asking for at Marine Mike?  Weld up stroker crank?

George

Not much at all George. Get center run out as close to zero as possible, chamfer connecting rod oil holes and balance. They said they had to magnaflux it too. Very run of the mill work. I guess they are slammed.

[gschuld]

Oh, I thought you might have been inquiring about a new stroker cb750 crank.

George

[bwaller]

George, you're thinking a "retired guy" like Mike should be trying to go faster? He needs to slow down man!