[runn141]

a freind of mine told me about a circle track where guys were running 4 cylinders, and they were taking the cranks and grinding the weights or weight off of them and having them rebalanced to rev higher and faster . has anyone heard of this? and if so what and where do you grind?

 

[johnsongrass1]

In circle track racing, throttle reponse is imperitive to success. Wether a 4 or 8 cylinder engine, rotating weight slows the car the accelleration rate.

There are too many things to be considered for you to be able to do this at home. Most weight is taken off the pins and the counter weight's.

This makes a very bad driving street or drag car though. It's pretty much for round track racing only. The inertia is needed for smoothness.

Stock V8 crank is about 50-52 pounds and cost $65. Ultralight cranks are as little as 32lbs and cost $2800 or more. You will also need the corrospoding light weight rods and pistons. Another $2500.

 

[OneMoreTime]

That is done for just that reason..they also run lite pistons and rods to get the weight down..Grind the counter weights down and knife edge them as well..Has to be done by someone who has the facility to balance the engine as balnce has to be checked as one goes on one of those..

Not too many that can do it as it gets a bit touchy as to how much and where to grind the crank..

Works fine as long as one does not go too far and weaken the crank..

This is not exactly a do-it-yourself deal unless one is an accomplished machinist..

Sam