ATI Torsional Damper / Harmonic Balancer

[Jagdpanzer]

Was in Baltimore on business today and made the mistake of stopping by ATI Performance Products on the way home. What great bunch of guys. Told them I was in a hurry an just stopping by to pick up some info on their LT5 torsional damper. After providing a full product briefing they insisted I stick around for an extra 15 minutes while they assembled an LT5 unit for me check out. Anyway to make it short I couldn't leave there with out it after laying eyes on it. A fine piece engineering and machine work as you will ever see. Here are pics of the ATI and stock unit and the massaging I had to do to a couple of the water pump bolt bosses on my 402 stroker build in order to achieve adequate clearance as you can see the ATI is slightly larger in diameter in this area.

ATI Part # 917298 (may be discontinued)

[tpepmeie]

Yeah, that price is close to what I paid in just for the design fee Oh, well, that's what I get for ordering the thing back in 2007 before I had even really started building the rest of the motor.

P.S., I had to get the hub ground to size, as it is just too tight for most cranks.

[Dynomite]

Originally Posted by Jagdpanzer

ATI part number is 917298

Here is the listing Jegs has for them:
http://www.jegs.com/i/ATI/085/917298/10002/-1

Originally Posted by Polo-1

You need to trim the water pump bolt hole boss, and remove the front cover timing tab. Then the ATI will fit the front of the motor.

Originally Posted by Polo-1

What I think Todd is having a problem with is , the ATI hub is too tight on the crank snout. The yellow or pink paper work said how much interference the fit is to be. I had to have my hub honed out for the Moldex crank.

Originally Posted by tpepmeie

I had to get the hub ground to size, as it is just too tight for most cranks.

So......The listing Jegs has for the Torsional Dampener http://www.jegs.com/i/ATI/085/917298/10002/-1

Will require two water pump bolt hole bosses to be ground a bit, the front cover timing tab (91'Z) removed, and possibly the inside diameter of the Torsional Dampener Hub relieved

Or have these issues been resolved in the latest Jegs listing?

[Polo-1]

I know Jeff has used the ATI on a stock crank. The hub fits like it should. On aftermarket cranks the snout's are a couple of thousandths thicker than stock, so the ATI hub needs to be honed a couple of thousandths.

ATI is the same as the ATI from Jegs or who ever sells it.
Timing tab must be removed from any front cover that has a tab. 2 bolts and it off.
And the stock washer for the balancer needs to be trimmed down O.D.

[Dynomite]

Originally Posted by Polo-1

I know Jeff has used the ATI on a stock crank. The hub fits like it should. Timing tab must be removed from any front cover that has a tab. 2 bolts and it off.
And the stock washer for the balancer needs to be trimmed down O.D.

There are degrees on the ATI Torsional Dampener. If I were to modify the timing tab (the ATI Torsional Dampener does not interfere with the timing tab bolts it appears) could I use that timing tab in conjunction with the degrees on the ATI Torsional Dampener?

Or are those degrees (TDC for example) on the ATI Torsional Dampener located at a completely different location than my TDC location on my existing (stock) Torsional Dampener with respect to the Torsional Dampener hub keys?

It appears if we keep the rpms under 5,500 we are in fine shape with a stock Torsional dampener

Who does that

[Polo-1]

Originally Posted by Dynomite

Or are those degrees (TDC for example) on the ATI Torsional Damper located at a completely different location than my TDC location on my existing (stock) Torsional Damper with respect to the Torsional Damper hub keys?

not that far yet.. still has a 18" Moroso degree wheel hanging on the front of the crank... need a couple of weeks.

[LGAFF]

I called ATI as the pulley seems like something that could be swamped out with an underdrive unit, appears that the pulley is very specific to the application and there are no other pulleys that they make that could be adapted as an UD unit.

[Polo-1]

1 pound lighter or .5 pound can't remember.. Just under $600 to my door.

Need to thank Todd P. for this, he paid all the up front money for ATI to make it a ready to buy part.

[secondchance]

Looks like you are well on your way to finishing. What is the target date for 402 completion?

[Jagdpanzer]

In the spring after the next Virginia emission test which I will do with the stock motor still installed.

Originally Posted by secondchance

Looks like you are well on your way to finishing. What is the target date for 402 completion?