doonjumper
1/2 ton status
Buying a 383 crankshaft from scat and I see one is lightened and one is not. Difference in price is $55. Is it worth extra cost?
CK5
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Is a lightened cranckshaft worth the extra $
- Thread starter doonjumper
- Start date
If you buy the "light weight" crank then plan on spending alot of coin to have the engine balanced since the pistons and rods will be alot heavier than they will need to be in order to balance correctly (IF it will even balance with a light crank).
Now on the other hand, if you buy light weight pistons and rods THEN you will probably need the light weight crank as well.
Also DO NOT buy a balanced rotating assembly, i repeat absoloutely DO NOT buy a balanced rotating assembly. Have your local machine shop do the balancing for you.
iirc lighter parts in the motor rotational assembly will provide quicker spin up/response there is a downside less momentum is carried through when off the gas compared to the heavier part.
Exactly.
I would go with heavier that will keep momentum going for longer.
Some older jeeps used heavier flywheels to keep momentum going, those engines were nice off road.
wanna be at 6 g's in the blink of an eye? sure, alum rods, lightened crank, etc.... offroad rig? nope....
Sorry to hijack the thread.
Any particular reason for this? Are they that far off from the manufactures? All of my motors have been pieced together after doing the math. So I've never used a "pre-ballanced" kit. I've always had my stuff balanced localy, but I'm just currious why you mentioned that.
K5Nate
1/2 ton status
I built an engine for Greg (496 stroker) and he bought a prebalanced rotating assembly and i had the forethought to have my local balancer guy check it after seeing what they did and it was over 400 grams off. I had to cut .375" off of each counter weight in order to get the crank light enough to balance correctly. Unfortunately for Greg it cost him more money in the long run (for the balance work) than it would have if we would have just balanced it locally but it definately saved him a TON of headaches and money later since i found this issue before the engine was put together and installed in his rig.
