Belto

I search and could not find nothing,, is there light weight pulleys for the cobalt 2.2??
if there is pliz post links
thanx

lightinbalt

I know that there is a light weight crankshaft pulley out, here is the link

http://www.z-spec.com/catalog.htm

You will have to click on Cobalt and it should be the second item on the list

Belto

thanx

roccityroller

lightinbalt, what elevation were you at when you ran that time?

slowion2

some of you guys may not be aware of, or care, but fluidampr is making crank pulleys for the 2.2 ecotec. I would look into investing in one of those before getting a "lightweight" one, but that's just me.

RedBaseBolt

Can you explain a little more about why we should wait? what are the benefits of their pulley compaired to someone elses?

slowion2

they explain it best on their site, but basically it works with harmonic dampening of the crank at high RPM's, which is definitely beneficial for peace of mind at least. as you bring up the revs in the engine, there are vibrations that will resonate at certain frequencies that can be potentially harmful for the life of the crank. a lightened crank pulley is not going to do that, it's just less unsprung weight to turn.

I was wrong, it was ATI: http://www.atiperformanceproducts.co...ts/damserp.htm

here's a good writeup of a dampener vs a lightweight/underdrive pulley setup: http://www.atiperformanceproducts.co...mper_dinan.htm

and some tech exlanations:
http://www.atiperformanceproducts.co.../101/index.htm
http://www.atiperformanceproducts.co...amper_tech.htm
http://www.atiperformanceproducts.co...ting/index.htm

jonnymerk

Nice links and good info.

eirhed

Please people, the reduction in vibration amplitude is damping which is done by a damper, not dampening or dampener. A dampener makes thinks wet and dampening is the act of getting wet. You have to remember that the factory damper (pulley) has a rubber element and an inertia ring to reduce the amplitude of the torsional vibrations of the crank. These vibrations are caused by the firing of the cylinders and the flywheel rotating to keep the engine spinning. If you remove the factory damper, you will remove your ability to reduce these vibrations which will fatigue and possibly break the crank. The people that manufacture the aftermarket pulleys and dampers do not fully understand the complexity of the mass-elastic system in your engine. I actually am a product development engineer for a company that designs and manufactures these dampers. A light weight pulley may reduce your rotating mass by 2-3 lb, but you will be increasing the likelyhood of causing some potentially major internal engine problems.

slowion2

oh dear me, however will I live with myself for using the wrong terminology . I appreciate the correction though.

your statement supports what I had posted, and the same as what is being stated here:
http://www.atiperformanceproducts.co...mper_dinan.htm

point being, this is why I have never run a lightened crank pulley on any of my builds

Stilgar

If you get an underdrive pulley say good bye to your A/C.

slowion2

um, what? the a/c would be fine. typically you would buy a set that has a larger pulley on the a/c and alternator, and a smaller one on the crank. either way it wouldn't cause failure in the compressor.

eirhed

Sorry man, just a pet peeve of us NVH guys......LOL

slowion2

hey it's ok, every time someone says NAWWS instead of nitrous I die a little inside LOL

so seriously though, you don't have much faith in ATI's products? I was impressed with the degree of info and depth they had on everything, but then again that can mean nothing.

Stilgar

I suppose if you compensate for the under drive pulley you would be fine. I put one on my ZX2 and my A/C stopped working. But it was just the underdrive pulley so i dunno.

slowion2

that I could possibly see, since it wouldnt' be spinning at the proper speed

eirhed

Don't get me wrong, they are explaining the physics of the situation fine, but that does not mean that they properly know how to design a damper. We have tested some of their Super Dampers, in which they used pressed rubber O-rings for the elastic element. These dampers do fine under normal conditions, but when exposed to our resonace fatigue test (accelerated life cycle) they failed in about 1/8 the time a typical production damper for the same engine would. So take that for what you will, myself being a custom truck builder for 11 years and now with my SS/SC will stick to the production dampers.

hemken

I have been thinking about getting this http://www.customcargrills.com/prodd...2%2DSEcopulley

slowion2

THAT is what I was wanting to know, and I appreciate the info. like I said, I've always stuck to the production unit, but was curious about this one. if it didn't hold up as compared to OEM though then I'll stick with what I have been doing.

Belto

wow I didint expect this much response and info ,,, thanx and pliz keep up writing about this so I can make up my mind and also a few other people that I know will apreciate this info..

I think im goin to wait more time to compere the current products and the ones neer to come.

eirhed

IMHO don't....you would be exposing your crank to the highest levels of torsionsal vibrations possible. That pulley is not even balancable, so not only will you have a high amplitude of torsional vibrations, but you will be putting your main bearings to the test as well.

Halfcent

I'm not a big fan of changing the drive pulley due to the harmonics issue. But if you want more sources, try this. The ecotec engine was used in Cavalier before Cobalts, and the pulley is the same. So do some searches for Cavalier as well in your explorations.

06Pursuit

iTrader: (1)

thread necromancing FTW!!! Any new info on this? I was thinking about doing it because I do AutoX and I was looking to get some faster revs through the corners, so I was considering this and a flywheel. So, whats the word on these dampers? or