Billet Crank???

[RiverRat]

After daytona I am going to install a billet crank into my SS Lamey PV motor. My hot rods crank has about 4 years on it. Has anyone run one? Notice a difference? I picked this crank up off a buddy. It had a bent rod but I sent it off to crankworks and had a complete rebuild on it. It is a RAD SS crank. They are supposed to be lighter that stock or hot rods cranks. How much lighter are they?

 

[Don 79 TA]

once crankworks rebuilds it, it will be like new
they are very strong (as are the crankworks billet cranks)
as long as rust doesn't build up or you hydro-lock it you will be fine, but that applies to all cranks
how much lighter? i don't know

 

[ATS_Scott]

We have a rad and I think a crankworks +8mm cranks at the shop. I'll throw them on the scale next time I'm there and I'll weigh a stock crank too.

 

[SUPERTUNE]

Yes, there is a difference between the Rad billet crank, they vibrate more in a freestyle engine and are more suited for race at higher RPM's, Must use higher pop-off with them to keep the carbs from dribbling.

 

[Roo]

We have a rad and I think a crankworks +8mm cranks at the shop. I'll throw them on the scale next time I'm there and I'll weigh a stock crank too.

Yep - you have a RAD 8MM stroker (triangular webs).

Rebuilt by Crankworks, one of the rods was replaced as well as all the bearings.

 

[SuperJETT]

So, it's a race crank instead of a freestyle crank?

 

[RiverRat]

Yes, there is a difference between the Rad billet crank, they vibrate more in a freestyle engine and are more suited for race at higher RPM's, Must use higher pop-off with them to keep the carbs from dribbling.

I have heard that about these cranks. Full circle cranks are supposedly better balanced, but the RAD's are lighter according to Crank Works. I have also heard that b/c of the triangular webs the airflow within the cases is not as smooth

 

[tricky1]

I have one of these as well, and cant tell any diff in performance from one to another.

 

[RiverRat]

I have one of these as well, and cant tell any diff in performance from one to another.

Did you notice any difference between the RAD crank and say a stock/hot rods crank?

 

[Kennay]

So, it's a race crank instead of a freestyle crank?

Interesting







































:laugh2:

 

[Mark44]

Would be a good time to think about ceramic bearings.

Mark44

 

[RiverRat]

Would be a good time to think about ceramic bearings.

Mark44

I talked to crankworks about that but they recommended the regular bearings

 

[Mark44]

y

I talked to crankworks about that but they recommended the regular bearings

Interesting I wonder why?

Mark44

 

[ATS_Scott]

RAD +8mm 19lbs. 3 oz.
Crankworks +8mm 18lbs. 8oz.
Unknown Mfg. with 650 crank webs +8mm 18lbs 8oz.
rusty stock crank 19lbs. 3.5oz
Unknown +5mm billet crank 20lbs 10.5oz.

All cranks weighed with full bearings, and the rear seal sleeve but no seals.

 

[SuperJETT]

RAD +8mm 19lbs. 3 oz.
Crankworks +8mm 8lbs. 8oz.
Unknown Mfg. with 650 crank webs +8mm 8lbs 8oz.
rusty stock crank 19lbs. 3.5oz
Unknown +5mm billet crank 20lbs 10.5oz.

All cranks weighed with full bearings, and the rear seal sleeve but no seals.

Did you leave off a couple of 1's? Are they 18lbs 8oz?

 

[RiverRat]

RAD +8mm 19lbs. 3 oz.
Crankworks +8mm 8lbs. 8oz.
Unknown Mfg. with 650 crank webs +8mm 8lbs 8oz.
rusty stock crank 19lbs. 3.5oz
Unknown +5mm billet crank 20lbs 10.5oz.

All cranks weighed with full bearings, and the rear seal sleeve but no seals.

WOW!! Thanks for those numbers. I will weigh my SS RAD crank tonight

 

[ATS_Scott]

Did you leave off a couple of 1's? Are they 18lbs 8oz?

DOH!!! good catch, edited post...

 

[wsuwrhr]

Interesting I wonder why?

Mark44

Durability is crap compared to a steel bearing, the performance you get out of them is nil compared to the extra maintenance.

I am sure CW is wise and wants to avoid blown-up crank/engine threads like the one last week.

Never good for a crank builder

 

[wsuwrhr]

I talked to crankworks about that but they recommended the regular bearings

CW knows their stuff.

 

[wsuwrhr]

RAD +8mm 19lbs. 3 oz.
Crankworks +8mm 18lbs. 8oz.
Unknown Mfg. with 650 crank webs +8mm 18lbs 8oz.
rusty stock crank 19lbs. 3.5oz
Unknown +5mm billet crank 20lbs 10.5oz.

All cranks weighed with full bearings, and the rear seal sleeve but no seals.

Good man.

I weighed a 12 and 16, a stock crank and even a 4mm billet kawi crank. I don't remember where I posted the weights though.