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| Any machinists want to tackle the forged crank into the cast crank block? https://slantsix.org/forum/viewtopic.php?t=67651 |
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| Author: | CNC-Dude [ Mon Mar 04, 2024 2:08 am ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
Quote: Quote: https://www.youtube.com/watch?v=I7daGYuiD6U
One thing that stuck out, they used the .060"/.090" split, not certain exactly if to center rest of mains, or throws on bore center. Either way, They had to machine the back of the crank sprocket to get it in line w/the cam, so Your machining isn't over with these shim spacers.About 10 minutes in. |
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| Author: | hyper_pak [ Mon Mar 04, 2024 6:38 am ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
Yea, I know there are some unstated issues that need to be investigated. I need to get the block on a stand and drop in a crank just to start the process. I guess there is no plug and play solution. |
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| Author: | CNC-Dude [ Mon Mar 04, 2024 8:27 am ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
I don't think either process would be a deal breaker, they both are relatively easy to do or get done...I'd like to know why they needed to create an offset in the placement of the bearing. They could have just added a second modification to the process unnecessarily.... |
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| Author: | slantzilla [ Mon Mar 04, 2024 8:42 am ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
Personally I see it as reinventing the wheel. When you're done the wheel is still round, just way more expensive. |
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| Author: | CNC-Dude [ Mon Mar 04, 2024 9:24 am ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
Yep....the gains from swapping blocks is probably immeasurable in performance and ET at the track.... |
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| Author: | convx4 [ Mon Mar 04, 2024 5:43 pm ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
Stan, I have the ability and accuses to the equipment needed, but loaded with projects. How quickly are you wanting the shims? Let me see if I can find some material in the correct .060 and .090 thickness. Let me know would be happy to help. Bill |
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| Author: | hyper_pak [ Mon Mar 04, 2024 6:08 pm ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
Thanks Bill, there is no rush for sure I will contact you will some details. |
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| Author: | ProCycle [ Mon Mar 04, 2024 9:08 pm ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
I think it's important to verify that 0.060" and 0.090" are actually the precisely required dimensions. You don't want even 1-2 thousandths of slop in the thrust bearing. You also don't want it to be 1-2 thousandths too tight |
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| Author: | hyper_pak [ Tue Mar 05, 2024 6:38 am ] |
| Post subject: | Re: Any machinists want to tackle the forged crank into the cast crank block? |
I agree on the thrust number. I just changed cranks in my motor and measured thrust. It is a critical number. Off subject but related, I built a 360 for my Ramchager years a go. I got the engine from an unknown source. I never checked thrust. I had checked trust on many engines and never had any problems. So I ASSUMED it was much ado about nothing. It was over a Christmas holiday so I only had a few days for the whole deal. First crank and run was fine. I put a timing light on the damper and WOW, the damper moved in and out at least a 10th! I had never seen any movement before and it scared me big time! I was stuck, didn't have a Plan B and I had to run it. That engine ran a whole year before the next Christmas and I had rebuilt the original 360. On tear down the trust surface on the rear was wiped out. Machine shop did not catch it, or did I. Lesson learned. |
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