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~
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| Alcohol, because no good story starts with a salad... https://www.slantsix.org/forum/viewtopic.php?t=63115 |
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| Author: | THOR [ Thu Dec 27, 2018 9:32 am ] |
| Post subject: | Alcohol, because no good story starts with a salad... |
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~ |
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| Author: | drgonzo [ Thu Dec 27, 2018 10:22 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
Balance will be achieved by, mallory metal, or.???? |
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| Author: | DadTruck [ Thu Dec 27, 2018 11:39 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
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. |
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| Author: | drgonzo [ Thu Dec 27, 2018 1:28 pm ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
It's an Intriguing idea for sure. I like it! |
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| Author: | Rick Covalt [ Thu Dec 27, 2018 1:51 pm ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
Please let us know how this one balances out? I may want to loose #15 off the next crank I do. 
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| Author: | J S Goldman [ Thu Dec 27, 2018 2:17 pm ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
I would LOVE!!!! some more details on the cuts you made!! |
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| Author: | THOR [ Thu Dec 27, 2018 5:16 pm ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
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~ |
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| Author: | DadTruck [ Thu Dec 27, 2018 6:28 pm ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
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.' |
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| Author: | emsvitil [ Thu Dec 27, 2018 8:31 pm ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
Quote:
the key point in that discussion is
So was the hacked crank cast or forged?
'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.' |
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| Author: | ceej [ Fri Dec 28, 2018 4:37 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
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 |
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| Author: | wvenable [ Fri Dec 28, 2018 5:02 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
I need to lose 15 myself. I guess it is back to the salads! |
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| Author: | slantzilla [ Fri Dec 28, 2018 9:56 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
Kinda looks like one of them fancy high zoot center counterweight race car cranks now. Baller! 
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| Author: | Greg Ondayko [ Sat Dec 29, 2018 6:26 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
Cool project Ceej and tyrde browne clan. Lots of planning and parts buying will surely pay diviends by year 2022! Greg |
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| Author: | Rick Covalt [ Sat Dec 29, 2018 7:20 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
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? 
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| Author: | Dart270 [ Sat Dec 29, 2018 8:44 am ] |
| Post subject: | Re: Alcohol, because no good story starts with a salad... |
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 |
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