Was at Ceej and Linda's for Christmas, and we decided to start on a project he's been wanting to do for quite awhile.

I will let the photos tell the story.












There is easily another 5 lbs that can come off this crank by my estimation.

~THOR~

_________________
1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

Balance will be achieved by, mallory metal, or.????

_________________
“Buy the ticket, take the ride.”
― Hunter S. Thompson

There is a Engine Combustion Engineer that I knew through my employment days that encouraged me to cut the counterweights off a slant six.
An in-line six is by design balanced.
Two pistons at TDC
Two pistons at BDC
Two pistons midway between TDC and BDC

It seems that the crank would still need to be
balanced to it self with each crank throw possessing
equal momentum potential.

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

It's an Intriguing idea for sure. I like it!

_________________
“Buy the ticket, take the ride.”
― Hunter S. Thompson

Please let us know how this one balances out? I may want to loose #15 off the next crank I do.

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I would LOVE!!!! some more details on the cuts you made!!

The cuts themselves were fairly simple. We used the portable band saw you see in the very first photo. Slow and steady wins the race using that device.

For the extreme ends of the crank, we made 3 cuts, all leaving approximately 1/8" of material on the outside of the raised bearing area.

For the very center, we had to make 3 cuts, as the width of the counter weight exceeded the width of the band saw.

For the mid sections, it was a singular cut needed to remove them. We wound up leaving a little more weight behind on these for balancing purposes.

~THOR~

_________________
1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

certainly form your own opinions,
below is a brief discussion on I6 motors and crankshaft counterweights

https://www.eng-tips.com/viewthread.cfm?qid=264190


the key point in that discussion is
'A limited life, low inertia, lightweight racing crank made from high strength alloy steel would probably not benefit from counterweights. On the other hand, a low cost, cast iron, production automotive crankshaft would greatly benefit from an optimized counterweight configuration.'

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

So was the hacked crank cast or forged?

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

This is a forged piece out of a John Deere BH block.

The crank got a bath at the machine shop a couple days ago, and made a short visit to the balancing apparatus. The heavy spots have been identified.

All further material removal will be done with a 4-1/2" grinder.

CJ

_________________
Part of Tyrde-Browne Racing

I need to lose 15 myself. I guess it is back to the salads!

_________________
66 Lil' Red Piggie Valiant (Mater Crusher) - Thanks Zilla!!!!! 72 Demon (Number 1 Son's)

Kinda looks like one of them fancy high zoot center counterweight race car cranks now.

Baller!

_________________
Official Cookie and Mater Tormentor.

Cool project Ceej and tyrde browne clan.

Lots of planning and parts buying will surely pay diviends by year 2022!


Greg

_________________
http://www.youtube.com/hyperpack

I guess there are some times the weight may be helpful? Contrary to what Greg and Seymour believe!!!

Ryan and I were talking with Shane Stymest who runs the Coyote Ford Mustang classes with a manual transmission, and he said to run the heaviest flywheel you can if you want go faster. Less RPM drop on gear changes I guess. I am wondering if the extra weight on the crank would be doing the same thing?

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Heavier flywheel and/or crankshaft will give more stored energy (flywheel inertia) on the line so harder/faster launches. The flywheel has much more effect since the mass is further out from the crank centerline. The inertial energy scales as the radius squared... In a light car, or for anything but drag racing or silky smooth street cruising, I would say go as light as possible on the crank and flywheel.

Lou

_________________
Home of Slant6-powered fun machines since 1988