Crank Underdrive Pulleys

[Suprarook]

I am in the market to upgrade my underdrive pulley or crank pulley ( don't know which name it goes by). I have a 92 N/A 7mge motor and thought about ditching the 10 lb pulley and going with something that would free up a little bit of hp and torque, along with a few more mods I am in the process of finishing. Unorthodox and OBX brands seem to offer lightweight pulleys and sort of affordable prices. I was concerned about the timing issue. A friend mentioned that aftermarket pulleys would throw the timing off on these cars and I was curious if any one of you have successfully upgraded that pulley and what steps I would need to do to get it done right. Any Tips !?

 

[IJ.]

DON'T get the cheap solid pullies for the Crank.

There aren't any proper underdrive Dampers for the 7M.

 

[Suprarook]

Ya see, my main concern here is that there is some kind of inner ring a little bit smaller than the diameter of the pulley that is on the car right now that is loose and I can physically wiggle it with my fingers, this could be throwing the balance off in a way. I have not yet removed the pulley to find out if it is mechanical breakage or whatnot. So basically what I should do is replace this with a stock, OEM part, maybe off of a parted out Supra?

 

[Poodles]

If I remember right, ATI is making one for the 7M now, but it's not listed on their site...

it's not cheap, but neither is one from the dealer. Find one off a lower milage engine (lots of N/A cars in junkyards...)

 

[IJ.]

It shouldn't throw the balance off unless it's slipped on it's hub, if so it won't be long before it breaks the bond totally and fails.

As poodles said ATI do a replacement (I have one) but not cheap, New stock isn't a whole lot cheaper and I'd hesitate to use one from a junker as it'll be just as old!

 

[jdub]

Actually the ATI dampner is a bit cheaper than a new one. Stock weights 11 lbs, the ATI weights 6.5 lbs iirc.

Part #918525
ATI 410-298-4343
Get the dampner w/ the timing marks

You will have to turn down your crank bolt flange to 1.780-1.810".

 

[figgie]

Hey IJ

what came out of retirement??

 

[Idealsupra]

Actually the ATI dampner is a bit cheaper than a new one. Stock weights 11 lbs, the ATI weights 6.5 lbs iirc.

Part #918525
ATI 410-298-4343
Get the dampner w/ the timing marks

You will have to turn down your crank bolt flange to 1.780-1.810".

is the ATI 6.5lbs with or without the AC ring? And if its with..how much lighter is it without?

 

[IJ.]

John: Other way around here due to shipping costs!

Wayne: Semi retired these days!

Jay: The AC pulley is Aluminium and only adds a few grams.
(maybe a 100 or so)

 

[Idealsupra]

John: Other way around here due to shipping costs!

Wayne: Semi retired these days!

Jay: The AC pulley is Aluminium and only adds a few grams.
(maybe a 100 or so)

ah ok...thanks

 

[figgie]

John: Other way around here due to shipping costs!

Wayne: Semi retired these days!

Jay: The AC pulley is Aluminium and only adds a few grams.
(maybe a 100 or so)

you and I both!!

 

[Suprarook]

YEAH THIS MORNING I WENT TO ATIPERFORMANCEPRODUCTS.COM BUT DID NOT FIND A PULLEY FOR OUR MKIII'S, I ORDERED A CATALOG, BUT NOW I HAVE THE PART NUMBER AND PHONE #, AND SOME GOOD ADVICE,,THANKS !!