ebay crank pulley info needed

[4g63turbo84]

i know that v8s are so different from a 4g63 but what i see alot is a billet aluminum under drive crank pulley on the v8s, so i want to know why cant you put the same ones on the 4g63 ( OBX BILLET CRANK PULLEY ECLIPSE TALON GST GSX 4G63 SILV : eBay Motors (item 390185127369 end time Apr-26-10 12:50:20 PDT) ) because if the stock one doesn't have fluid, why wouldn't the ebay one be the same as the stock ones???

 

[CrazyM]

This is another very heated debate. Many have run with one and never had problems. Many have run with and say it wrecked their motor. The motor is balanced wirhthe harmonic
balancer\crank pulley.

Personally I bought an eBay one and have it sitting in my room. If I really want to upgrade it I'm going to go with a fluidampr one. safest and best bet

 

[LiquidX]

The OEM pulley is a HARMONIC BALANCER which is a sandwich of rubber and metal. The torsional vibrations in the crank are canceled out within the balancer. Sure, you can run the OBX pulley but be prepared for a broken crank down the road. If it's just a track car then go ahead and get a solid pulley but for street stick with true OEM or the Fluidamper.

 

[9!'clipseDOHC]

The stock one doesn't have fluid but it does have a rubber damper. On the DSM's its not just a crank pulley but a harmonic balancer/dampener so replacing it with a solid pulley puts stress on the crankshaft which isn't a good idea. A good aftermarket alternative to the factory one is the Fluidamper Crank Pulley but it is very expensive.

Check out this article on the subject: Mach V - Tip 11: Crank Pulleys

Hope this helps!

**Edit - ^^^ I need to learn how to type faster!

 

[4g63turbo84]

ok thanks for he info

 

[SBR Joe]

Ive been running the alum pulleys for years. Never had one problem making over 400hp on every application. I wont run anything less, theyre light, and wont come apart!

 

[my98gsx]

I agree with joe, ive ran all aluminum pulleys on my cars for years. From what ive seen, once your engine is balanced, and the shafts are removed theres no issues with using an aluminum crang pulley.

 

[wird06DSM]

Hey joe was this on a Fully balanced motor. Or just a stock motor with one tossed on it?

 

[Boosted98gsx]

I agree with joe, ive ran all aluminum pulleys on my cars for years. From what ive seen, once your engine is balanced, and the shafts are removed theres no issues with using an aluminum crang pulley.

Balanced HAS NOTHING to do with the harmonics of an engine.

 

[91stocker]

I purchased a cheapo pulley a while back but never installed it after all the bad i heard about them. It got me thinkin though haha, so i checked the balance of the pulley itself and wow was it terribly off balance. The pulley only weighed near 1lb, but the quality and balance was horrible. I wonder if the damage is being caused by the quality of the piece. Sort of like putting a weight on one blade of your ceiling fan and turning it on. The blades will rip that fan apart.

 

[donniekak]

Balanced HAS NOTHING to do with the harmonics of an engine.

This. No matter how well an engine is balanced, the pounding of the rods make the crank, especially a forged crank ring like a bell. Also, contrary to popular belief, a heavy damper and flywheel allow you to rev higher. It works like this. At 7,000 rpm's the engine is turning faster, and slower than 7,000 rpms, 7000 is the average rotational speed. When the piston is on the power stroke the crank is accelerated. During the compression stroke, the crank decelerates. The more pronounced the difference, the harder it is for the valvetrain to work properly. Think about it. At 7000 rpm, and %10 rotational speed variation, the cam lobes will be tossing the valves at the same speed as it the engine were turning 7,700 steady state rpm's. This is why all super high revving cars use a large torsional damper. If you have ever seen a crankshaft, and camshaft operate under a high speed strobe matched to rpms, this all becomes very apparent.

 

[Bender]

I don't recommend one. Go either OEM or ATI. Even the Fluidampner's have been the cause of a couple engine failures. They seem to be a hit or miss, but I have never seen a problem with the ATI one.

 

[turbo addict]

I don't recommend one. Go either OEM or ATI. Even the Fluidampner's have been the cause of a couple engine failures. They seem to be a hit or miss, but I have never seen a problem with the ATI one.

from what I had heard the fluidampr problems are usually related to the outside temp, too cold. but many dont have issues, but ya the ati is a good one. I'm going to use a fluidampr on my 2g, I have had a ebay aluminum one on my mirage since 2002 and have not had any problems. All of my friends told me they do not work, ironically almost all of them have had stockers fail and do some sort of damage and left them on the side of the road.

so really your taking a chance with anything but an almost $500 ati.

 

[Bender]

The problem related with the fluidampner one is that it doesn't work well the the oem timing gear. The ATI one costs more, but it includes another timing gear/hub assembly that it works with. Also, You can get them for $415 at extremepsi. That doesn't make them much more than the fluidampner, and it worth the extra insurance IMO.