Crank pulley absorbs vibrations through the crankshaft (harmonics), thats why it is a two piece item with rubber or fluid or something to act as a shock absorber. Replacing it with a soild metal pulley can acutally cost power in some applications due to increased internal resistance. Weight actually has very little to do with it as far as reliabilty or power output is concerned.

A good fluidampr pulley is usually heavier than a stock crank pulley, yet it can gain power due to doing a better job than the factory piece.

 

Underdrive pulley and belt arrived today! Here's some pics.

 

do a before & after dyno!

 

Most likely I will need to take it to another shop to have an accurate Dyno. Not happy with the results I was told today over the phone without the pulley installed. There has to be an issue with thier Dyno.

 

what kind of dyno and what numbers?

 

Still sits in the garage. lol

Waiting for a Buddy to install it. I don't have the tool to Lock the Flywheel. So I gotta make a call for some help.

 

guaranteed you're still going to be unhappy with the numbers even after the pulley is installed.

 

What do you need to lock the flywheel? Couldn't you put the car in gear and hold the brakes?

 

Its tighter then you think. Old school methods don't work. Putting it in gear with E-brake on is no help. Bumping the starter with a breaker bar locked is no good.

You need to remove the starter and lock the flywheel to remove the pulley. Or damage could be done. Best to do it the right way.

 

Impact gun won't work with the car in gear and brakes?

 

I wouldn't count on the e-brake, but if you can move the car with the service brakes applied by trying to loosen the crank pulley, then thats a bad mother****er.

 

Nope didn't get the job done. I even pulled the Radiator out to get a Large Gun in.

 

I know its a dumb question, but you turning the bolt the right way?

anyone know if its a reverse thread or normal .. I'd assume its normal

 

I've heard of underdrive pulleys doing damage to the motor by not properly turning the waterpump at the proper speed.

 

More motivation to leave good enough alone.

 

For now thats the case! I'll get it done when I have the time. I plan to make a Tune appt this week. I should call now. Been slacking due to other projects.

***Edit*** F' that! I'll just sell it. lol Not going to install it.

 

How much you want for it?

 

lol

 

BTW...

Are you guys re-using the stock bolts? They are TTY, should be replaced every time if thats the case.

 

any updates on this pulley install? Any pictures installed on HR?