Thread: VE 4CW crankshaft max load

would having the crank balanced remove this harmonic in balance? or is it just because of the placing of the weights?

its the placement of the weights. The cranks are balanced very good from factory.

ahh well.. im sticking to my 4cw anyway as there are hardly any 8cw cranks around over here (i have been looking).. and im only going to be doing the odd drag and track day.

this isn't good news.

Good thing I have 4 parts de's lol anyone wanna buy a 8cwc? Heh

its not a black or white thing. Nothing to worry about.

I am right now building a bottom end.

It will have SR16VE N1 pistons in it that I got out of a N1 motore I parted out. I had the pistons swain tech coated, this should keep me out any trouble with detonation as the top of the piston will not get hot with 12.5 to 1 compression running 93 octane. I also will be running a 4 CWC. I am running the 4 CWC for the weight benefit. I am hoping that I will pick up about 2 MPH with these 2 mods.

If a 4CW crank gives you 50,000 miles on your build of hard driving this is great. There is no impending doom.

My ex setup was running a 4cw knife edged crank and i ran a bearing now recently. No 3 bearing and also some signs of wear on no 4. I do mainly hard street driving and 1/4 mile racing and a bit of "street racing". Had limiter set at 9krpm and saw the limit a few times a day. Didn't record the mileage but think I got about 7000-10,000km on the motor before the bearings went. Bottom end was balanced. 20ve rods and 16ve pistons.

It could be partly attributed to fuel dilution in the oil, but I guess I will never know.

This thread has me a bit worried now seeing that I'm in the process of rebuilding the motor. How much will I loose/gain by switcing to a 8cw knife edged crank?

Doctor G, knife edging the 4 CWC in my opinion is not a good thing to do. It throws off the complete thing. It actually makes it worse, I read an article on making your crank to light vs bearing life. Light crank is great for rev speed and high RPMs but the lighter you make it the harder it vibrates. If there was no bad effect of making cranks super light the car industry would have gone that route. I cant explain the facts behind it as Ii read the article many years ago.

As said before if you are building a race motor that you might tear down every 5,000 miles then to change bearing for a refreash these things are not a problem

What about knife edging the 8cw crank?

Since this is a street build I want some reliability. 50,000km sounds good to me.

Or should I just throw a stock 8cw in there with a teflon crank scraper?