21

We had the crank internally balanced for the least amount of internal stress. Big strokes do not respond well to external balancing. We also wanted to simplify the front balancer and the flywheel by not having them have to have balancing weights. 

The crank was balanced by milling holes in the counterweights and tig welding chunks of heavy tungsten based Mallory metal to the counterweight itself. 

LS cranks tend to spin the crank angle sensor reluctor wheel off the crank causing the ECU to lose crank sync. 

Our own team fell victim to this with our famous engine builder motor which created a DNF. To prevent this from happening ever again, we tig welded the reluctor to the crank.

Our Lunati signature series crank's journals were nitrided and micro polished for a hard and smooth bearing surface. 

We chose Callies Ultra Connecting Rods for our motor. We chose these rods because they are the longest off the shelf rods available for the LS. We did not want to resort to any one-off custom parts in case we needed a replacement quickly mid-season. 

The rod bolts are custom made for Callies by ARP out of super strong Custom Age 625 steel. The rod bolts are canted to allow for more internal clearance on big stroke engines like ours. 

The rods themselves are machined from a custom blended proprietary clean steel alloy from Timken.

 

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Comments
twist
twistlink
Tuesday, May 22, 2018 10:53 PM
No WPC treating? What gives?
Tofu-man
Tofu-manlink
Wednesday, May 23, 2018 10:48 AM
Lets give Dai more speed next round, seems like he is always getting smoked on the chase run : (
turbothomas
turbothomaslink
Wednesday, May 23, 2018 12:07 PM
great article, and thanks for all the technical info. it's hard to find quality articles with actual info.
Mike Kojima
Mike Kojimalink
Wednesday, May 23, 2018 10:50 PM
Everything is WPC treated, there is a part two to this!
MattAtPlaton
MattAtPlatonlink
Thursday, May 24, 2018 10:46 AM
Great article! I always learn so much from you guys.
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