Buick Racers/Engine Builders, I know that a Buick crank can be taken from a 2.25 rod journal to a 2.00 to create a 4.150 stroke. From what I hear this is a fairly easy and successful modification. Has anyone ever tried taking the rod journal down to 1.880? Going to a 1.880 rod journal could create a crank with 4.250 stroke and over 500 cid. Also, a 1.880 rod journal is the same size that most pro stock engines are using today. Thanks
Hi John, Long time no talk to!:grin: Sounds like that STG2 is flyin'! :TU: Anyway....I would seriously question the weakening of a cast crank such as our's when reducing the journal over-lap that much, BUT... then again I'm scared of it at 2.00" too! :laugh: Just MHO here...... :TU:
I've got a question that I can't seem to figure out. I took my stock crank, cut to to 2.00 diameter for a stroke of 4.150(494). My problem is that I didn't know that the Crower rods are wider that stock Buick rods. The dilema that I have now is do I send the crank back to the shop to get the journals widened(which will probably require the journal be cut again -.010), or do I cut sides of the rods? Some say you'll weaken the crank, other say don't cut the rods. What should I do?o No:
Reynold I am no expert but I will tell you if you narrow the rods you will have to narrow the bearings and every time you change the bearings you will need to do this. I would go the next under size and use the uncut bearings. We run a 494 in an 8 second regal and it see's over 6500 all the time and we have yet to break the crank. We've broke a lot of stuff but not the crank. To be honest I've only heard of one guy breaking a crank and that was a stock stroke motor.
John, Why not order a new steel crank from us with the stroke and journal sizes you want. Or better yet use a new block with a 600+ cid combination!
Thanks Bob. I really needed advice on this one. That's what I had on my mind too but I've only got one crack at it to get it right. :shock: I'll send it back to the guy who cut it originally and have it widened in the journals. Should I have any thing else done to the crank while it's there? Cross drilling, knife edging,etc.?
Reynold, If your crank grinder is careful he should be able to widen the crank pins without touching the journals. Have him stay .005"-.010" off the journal surface, he should be able to blend into the fillet of the crank pin and even if you can see a line it most likely will not touch any part of the rod or bearing. Good luck. Mike Tomaszewski TA Performance Products Inc. PS We have these cranks in stock ready to ship.
Thanks for the input Mike. Your responses are always appreciated. To borrow a phrase from Wayne's World, "We're not worthy, we're not worthy, we're scum!":laugh:
