i personally have known this for years. some of you may not. so i would, if i were you. take the time and read.

http://www.atiracing.com/products/da...mper_dinan.htm

 

Great information, thanks.

 

hmmm intresting but yet true...thus i will never do this to my car

 

Very informative read.

 

Correct me if I'm wrong, but i thought our cranks were internally balanced and the crank pulley was just that, a pulley and not a harmonic balancer as well.

 

the crank pulley is the weight it is for a reason. along with the stock flywheel.

when one of these is changed, it can cause problems with the bottom end.

 

Yes that is understood. But the link is talking about removing the harmonic balancer and replacing it completelty with a light weight pulley on a BMW. On our motors we woulndn't be doing that, correct?

 

this is what i was thinking as well.... sub'd for more info

 

the crank pulley is a certain weight for a reason. lightening it up will result in failure.

 

Wouldn't making it lighter spin it faster? This link talks about spinning it slower. Unless you mean lightening it and going underdrive? Forgive me if I'm mistaken, I don't know much about cars but am trying to learn as much as I can.

 

i was going with an underdrive pulley from OTTP but Josh advised me not to cause of some "issues" thats why they never finished making/selling them

 

I plan on doing the stock size just lighter from MRZ. Has anyone in the community had failure to do this?

 

this is good to know. i have a buddy with underdrive pulley's on his '01 bullitt mustang. wonder if he's doing damage...

 

This is the whole point of that article.... Do not change the weights of essential engine parts.. because its "lighter", it spins with less force, blah blah blah...

The article explains what can happen when you change the weight anyway...

It can cause problems.. just like lightweight flywheels have known to cause some misfire..

 

It always seemed strange to me why people would bother with a mode like that for such minimal results. A lot of people with mustangs camaros ect that I know would do pulley swaps and gain 3-4 horsepower but spend hundreds and hours to do it. It always seemed to me like pulley's were a very final mod on a race use motor.

 

Thanks for the info area, I'll add this to the database that spins in the back of my head for future reference. I was considering a lightweight pulley in the future, but I wont be after reading that. I had figured that keeping it the same size and just lightening it would be OK, but after reading that it makes good sense as to why this would be very bad.

Thanks

BTW, maybe stickey?

 

Sadly it won't happen

the paying vendors will start complaining

 

very interesting! thanks area

 

ive never saw a single bottom end failure in any ecotec engine as a result of a lightened crank pulley and thats since 2002

 

i would prefer to take my information from much better sources.

wasn't it victory red ss's DD car **** itself and destroy a crank? didn't it also have a lightened crank pulley on it?

 

but didnt he also have one of the first gen ones that became on here known to leaking the crank seal?
im with rodiums on this one i havnt seen one as a direct result of a pulley on here.

Correct me if I'm wrong, but i thought our cranks were internally balanced and the crank pulley was just that, a pulley and not a harmonic balancer as well.

 

so since i have a lightweight flywheel...it could be a reason on mwhy my car isnt as fast as it should be?

 

That was a very good article, but I do have one question. If they are bad (and I am not saying that they are not) why does gmpp make them. I don't know enought about the subject to make an argument one way or the other, I am just trying to learn. I just remembered seeing the gmpp power pulley, and after reading the article, I wondered why they would make one if it can cause that much damage. Here is a link to the part I am talking about.
http://www.crateenginedepot.com/stor...-P330C135.aspx

 

I'm guessing that it's for built, race-specific motors

 

677 dollars! good god!