Re-calibrated my balancer today.

machine shop tom · Post by **machine shop tom** » Fri Oct 16, 2009 4:45 pm

So I've had a few cranks lately that have made me wonder. WAY out, front-to-back, and imbalance #'s that I didn't expect. Today, I was balancing an old 327 small-journal crank. I know it would probably need heavy metal.

The initial imbalances were 64 grams out in the front, 30 in the back, both calling for heavy metal to be added. Another crank I did was also out a lot end-to-end. So I turn the crank around on the machine--the imbalance #'s followed the crank.

So I figure that at least the machine is reading the ends correctly, but I wonder how close it really it. I checked it last spring, it was okay then (I disremember the exact #'s). I break out the test mandrel.

It was off two tenths and change.

I re-calibrated it. Now it's within a tenth and change.

There, now I feel better........

tom

revolutionary · Post by **revolutionary** » Fri Oct 16, 2009 5:56 pm

Dude, calibration is for sissies. Just eyeball it.

rustbucket79 · Post by **rustbucket79** » Sun Oct 25, 2009 10:43 am

Leads me to the question of why can't you buy a replacement cast piston for some of these engines that aren't 75 grams heavier than stock?

rmcomprandy · Post by **rmcomprandy** » Sun Oct 25, 2009 11:31 am

Off just 2 tenths ... I'm glad it makes you feel better 'cause nobody else will ever know, lol.