i am planning to buy the race version for my motor and when i looked at the site there are two versions....a 7.074 and a 6.325....anybody here knows the difference between the two??? and if you are running this on your car which one do you have and what size belt did you use.....any input is greatly appreciated

 

No experience with the ATI myself, but...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Endyn &raquo;</TD></TR><TR><TD CLASS="quote">
The ATI dampers are great in a narrow RPM range, but they can't cover the entire spectrum like Fluidampr's.
ATI sends reps to most of the races, and they spend a lot more on advertising, and contengincy than Fluidampr, so they get a lot of buzz in the import arena.
I've used them before and the 92mm engines we used them on all had bearing issues. Since the switch to Fluidampr, we've had zero bearing problems, and we haven't changed our building techniques.
We've also had engines that customers failed to correctly tighten the flywheels on, or they used flywheel bolts that bottomed into the crank hub, and even those have survived well under the circumstances.
I can assure you that if the ATI dampers were better, we'd be using them. I have no deal with Fluidampr. We sell what we use.
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Eagle, Scat, Lunati, Crower, Callies all do not recoment fluid type balancers on their cranks.

There has to be something to that

Last year I seen 2 motors with blown away front main bearings due to old fluidampers that sit over the winter, the fluid all ran to the bottom and never evened back out making them terribly out of balance.

They are ok when they are brand new and run consistantly

 

Well, my engine builder doesn't recommend ATI, and gives reasons for it.

 

I run the 7 one and have just about more dyno pulls to 240+ whp all the way up to 265 with the ATI unit. I made a post showing my bearings after 412 dyno pulls and 14,000 miles.. I'd say its proven itself over the whole rpm band all the way up to 11k just fine.. Waiting for similar results with the fluidamper.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tbone &raquo;</TD></TR><TR><TD CLASS="quote">I run the 7 one and have just about more dyno pulls to 240+ whp all the way up to 265 with the ATI unit. I made a post showing my bearings after 412 dyno pulls and 14,000 miles.. I'd say its proven itself over the whole rpm band all the way up to 11k just fine.. Waiting for similar results with the fluidamper.</TD></TR></TABLE>

Hmmm..... You pay for 412 dyno pulls and you're ON! LOL.

 

thanks for all the input...btw which size belt did u use on the size 7 one

 

I run a single cam belt because I use a single cam pully on my alt, so it wont rub the framerail. I just bought a bunch until one fit