Quote Originally Posted by 36 sedan View Post
Certainly no expert, but curious why you choose a 6-3/4" balancer over a 8" for your cast stroker crank? And, why forged pistons over hyper? Won't the additional piston clearance and expansion rates affect the streetability? Again, I'm no expert and don't mean any disrespect, just trying to learn.
I would believe your curiosity to be well-founded, as it has appeared to me over the years that the OEM's use a larger and larger damper the longer the stroke gets. This larger damper, however, tends to require additional torque to accelerate, torque that could be applied to the rear tires to accelerate the vehicle. So most fellows who want to accelerate the vehicle quickly will choose a smaller damper at the expense of betting that the subsequent lack of damping won't crack the crank. Here is probably the best collection of technical information that I have seen gathered on the subject of harmonics......
Damper White Paper : BHJ Dynamics, Harmonic Dampers and Specialty Crankshaft Vibration Dampers

As far as pistons, most fellows will find that a street motor will do just fine with cast pistons or cast hypereutectic pistons. The hyper part simply means that there is an overage of silicon used in the alloy that the pistons are made from. As you have alluded, the cost and initial start-up noise from excessive piston to wall clearance makes forged pistons seem like overkill for the common street motor. Now, if a fellow is going to add spray or bolt on a lung, then forged pistons begin to look like a better choice.

I don't know if we'll ever see mprevo back posting here again because I may have embarrassed him by telling him the truth.
Here is his post telling us who recommended the overdrive transmission and the fellow's credentials.....

"I have already purchased most of the parts for the engine. The cam I selected is a little aggressive but my tranny builder says it will be OK. My friend (and builder) owns a transmission shop and is probably the best mechanic & builder I know. In fact he also teaches these subjects at our local college. He is going to go through this 700R4 from top to bottom with me. He is the one that told me this is the tranny I need for the usage I am planning. He says he can build it "bullet proof" for me. Only time will tell though. Why do you say it won't work? I always say that I'm never to old something new from the experts, so I would be interested in your thoughts."

Well, I told him that this transmission fellow failed to take into consideration the camshaft that was to be used in this combination and matching the cruise rpm to the final drive gear ratio and so I suspect that mprevo is a little put-out over that as well as a few other comments I made concerning his choices.

It is my hope that he will continue to post here, but I have my doubts.

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