Howdy, I am writing to verify that I havent screwed up with my balancing. I gave them a flexplate from an automatic, and I had my mahine shop balance the rotating assembly without the stock dampner, since I believe that it is nuetral on the front. My questions are:

1. I have a M6. Is the balance on the flywheel different than the automatic? Should I be concerned?

2. Should I have given them my dampner assembly? I thought LT1's were neutrally balanced in the front.


Thanks for helping!

 

your right on the neutral balanced part. They do not require the balancer if it is neutral in the front.

As for the rear... I did the same thing. Since they will be adding of removing weight from the automatic flexplate you will need to have the T56 flywheel reblanaced to match the auto flexplate.

While its back in the shop you might as well get them to resurface it too.

What you'll need to do is give them the felxplate you had the motor balanced with along with the T56 flywheel and tell them you want the flywheel balance matched to the flexplate.

It might be a good idea to keep the flexplate as a template. Just in case you get a diferant flywheel of if you need to replace the T56 one, you'll have a template to balance the new one to.

 

But wouldn't this be an issue with the auto-manual swap crowd? My thought is that if you can swap between an auto and a manual, the balance of the two flywheels/flexplate is exactly the same?

 

SHOULD BE THE SAME. INTERNALLY BALANCED ENGINES DONT REQUIRE WEIGHT TO BE DIFFRANT.

 

I was under the same assumption.... turns out that the flexplate I bought needed to have weight removed.

when I got the T56 a lot of the weight needed to be removed. Its was far from a bolt on swap.

IT wont hurt to make sure its balanced properly. Better to do it and make sure now rather than having it all installed to find that its not balanced. Then you'll have to re and re everything again.

 

As long as you are building a new motor, why not have it internally balanced to neutral? Than you can swap flywheels/flexplates to your heart's content, as long as they are neutral balanced. Some people think internal balance places less stress on the crank, FWIW.

Rich Krause

 

but what about the factory? Both the auto and m6 use the same exact engine, with the same balancing inside. What gives? Other than the obvious larger mass that the m6 flywheel posesses, shouldnt the counterweight be the same?

 

I believe that it is. In fact, when I first swapped the T56 for a TH400 I simply swapped in a standard external balanced flexplate with no problems.

Rich

 

MAYBE IM WRONG BUT ARENT ALL THESE MOTORS INTERNALY BALANCED

 

Nope, the LT1 motor is internally balanced on the front 1/2 (that is why the dampner has no keyed shaft to locate it), and externally balanced on the rear. Weird stuff, huh....

 

I QUEES YOU LEARN SOMETHING EVERYDAY WELL I KNOW MY BIGBLOCK IS INTERNALY BALANCED

 

dude, lose the caps lock please

 

Sorry about thatIim at work and all our stuff is done in caps lock. Its just habbit.