Crankshaft harmonics?

[SSDiv6]

Originally Posted by art leong

Even though the crank checked fine I'm going to put in a stock crank. I don't believe 8 pounds will hurt me that much. And maybe I'll get rid of these "one of" problems.
My other motor with less cam, less compression, and a stock crank. Responded to rpm a lot better than this motor. It was half a second between bracket mode and race mode. This motor was only two and a half tenths. That's shifting 1000 rpms short and running taller tires.
It might go quicker with the stock crank.

Art, I believe you will not notice that much of a change in performance.
Nevertheless, if you want to get the best out of the crankshaft, I would suggest your crankshaft to have some weight removed and probably change the shape of the counterweight and have the lightening done properly.
My choice and recommendation is Shaft Tech:
http://www.shaftech.com/modification.html

[art leong]

Originally Posted by SSDiv6

Art, I believe you will not notice that much of a change in performance.
Nevertheless, if you want to get the best out of the crankshaft, I would suggest your crankshaft to have some weight removed and probably change the shape of the counterweight and have the lightening done properly.
My choice and recommendation is Shaft Tech:
http://www.shaftech.com/modification.html

Thanks for that, but I think I'll just use the stock crank and leave the trick stuff for a new owner. I went to the Billy Nees academy of race car finance (actually he might have got it from me LOL). I don't want to spend $1,000 or more on a crank.
The whole car is for sale for $12,500 LOL

[tj310]

Does your 2.4 engine have a separate balance shaft ?---Trevor

[art leong]

Originally Posted by tj310

Does your 2.4 engine have a separate balance shaft ?---Trevor

It was removed. Just about everyone that runs a 2.4 removes them. Without any problems.

[THoagland]

Which damper you running?

[art leong]

Originally Posted by THoagland

Which damper you running?

I started running an Innovators West. I took it off because I thought I damaged it installing it. I sent it back and there was nothing wrong with it.
Now I'm running a solid metal pulley. This is an inline 4 cylinder. Quite a bit different than a V8.

[SSDiv6]

Originally Posted by art leong

I started running an Innovators West. I took it off because I thought I damaged it installing it. I sent it back and there was nothing wrong with it.
Now I'm running a solid metal pulley. This is an inline 4 cylinder. Quite a bit different than a V8.

Art, running a solid metal pulley is a recipe for disaster on a high RPM 4 cylinder engine, especially if you do not have counterweights and no dampening.

Here is a link with some good discussion on the subject:

http://www.eng-tips.com/viewthread.cfm?qid=107602