Author Topic: Billet Crankshafts  (Read 796 times)

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Offline gschuld

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Re: Billet Crankshafts
« Reply #25 on: December 23, 2020, 10:22:33 pm »
Awesome😎

George

Offline 754

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Re: Billet Crankshafts
« Reply #26 on: December 23, 2020, 11:52:26 pm »
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.
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Offline kmb69

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Re: Billet Crankshafts
« Reply #27 on: December 24, 2020, 07:27:52 am »
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.

Offline 754

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Re: Billet Crankshafts
« Reply #28 on: December 24, 2020, 10:59:49 am »
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.. 
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Old Scrambler

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Re: Billet Crankshafts
« Reply #29 on: December 24, 2020, 11:03:57 am »
Inquiring minds need to know............are they all spoken for?............early or late Busa, or either?
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
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Offline kmb69

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Re: Billet Crankshafts
« Reply #30 on: December 24, 2020, 11:32:58 am »
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.

Offline kmb69

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Re: Billet Crankshafts
« Reply #31 on: December 24, 2020, 11:40:48 am »
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.

Offline madmtnmotors

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Re: Billet Crankshafts
« Reply #32 on: December 24, 2020, 12:05:26 pm »
Nice!

🤤 🤤 🤤
TAMTF...


Wilbur



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                                           http://oldmanhonda.com/MC/wiring750K1.html
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Offline dragracer

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Re: Billet Crankshafts
« Reply #33 on: December 24, 2020, 02:24:24 pm »
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. 

Offline MRieck

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Re: Billet Crankshafts
« Reply #34 on: December 24, 2020, 04:13:10 pm »
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. ;D
Owner of the "Million Dollar CB"

Offline Old Scrambler

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Re: Billet Crankshafts
« Reply #35 on: December 25, 2020, 08:41:17 am »
Thanks, Keith............your knowledge is an added Christmas present ;)
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
'63 CL72 Project(s)
'66 CL77 Red
'67 Triumph T100C
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Offline kmb69

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Re: Billet Crankshafts
« Reply #36 on: December 25, 2020, 08:52:02 am »
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. ;D

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!