Ok 2 questions. I got the blower spacer machined down to line up with my ati damper, and got the belt back on. Started the car and everything sounds normal. standing in front of the car and giving it some throttle the belt squeals. i thought it was pretty tight. How much should you be able to move the belt by pushing it once its tightened to spec. I can see the idler arm moving with the car running. Is that normal

Second question i took it out for a road test and it almost feels like a vibration. I can feel it in the throttle pedal and in the seat and i know it wasent there before i hooked the blower back up. Anyone have any ideas on either question

 

Come on guys, I find it hard to believe no one has had a squealing blower belt before. Im figuring its a result of slipping, should i tighten it more and would a belt to loose be the vibration feeling im having to.

I drove the car today without the belt on and the vibration was not there

 

I don't have experience with Procharger but sounds like a bad tensioner.

Blower belt should be very tight with engine off (~1/4" deflection).

Squealing belt and bouncing around of the tensioner would indicate to me that tensioner is bad or is poorly secured to mounting bracket.

You removed the blower belt and vibration went away so you isolated the issue to the SC system.

Check SC crank pulley bent/loose, tensioner spring bad, tensioner loose to mounting plate, blower bearings excessive play, check pulley alignment, check correct belt length/condition.

Hmm.
Trying to visualize what actually you changed. But it sounds like what ever you had done created the problem,no? Did crank pulley spacer change and is it not centered/out of round?

-Scott.

 

either that or your lower pulley you put back on isn't centered

 

The reason i had to get the spacer machined down was the ATI super Damper sticks out about 1/2" more than the stock LT1 damper. I am going to try a new belt and make sure its tight enough. If it needs a 1/4" deflection then i dont think i had it tight enough. Hopefully that will take care of the belt squeal. Then i will tackle the vibration. When i took the old motor out everything witht he blower was good and i reused the same pulley, spacer. I will check the items you reccomended

 

FYI. Just read on another board where someone was having squeal issue with his Procharger and gates belt. He purchased the gatorback from autozone and it went away.

-Scott.

 

I couldnt find a belt in my area so i called a company in louisiana called Belts for everything and they had a 14 rib beltthat they will cut down to 12 for me. so well see what happens

 

I just had a thought. If the spacer or the pulley isnt centered wouldnt i feel the vibration all the time. The pulley and spacer is still on the car it just doesnt have a belt on there

 

600,

Maybe not. You might not feel it until the belt is on and going from tight to loose rapidly. This could be why your tensioner is jumping round.

You said it was the same spacer that at some time ran ok with no vibe. You had it machined to thin it up only, right? So bolt hole or OD dimension did not change right?

People say that the stock procharger belt tensioner is not that great. If that is what you have then you might want to look why it seems a lot of procharger guys go to aftermarket tensioners.

Don't some guys with the 12-rib run two 6-rib belts?


I'd say get your new belt and try it. Look at the tensioner at that time.

-Scott.

 

Yeah im hoping my new belt will be here on monday. As far as the spacer goes. the only thing that changed was the thickness. the od and holes didnt change at all. Im starting to get the little issues that go along with a new engine build down to just a couple and this is one of them.

 

Let us know what you find!


-Scott.

 

Well I got the new blower belt on today and i think it took care of the sqealing issue, but i still feel the vibration. But its odd, I only feel it and hear it when the car is in gear. when its in park i dont hear it

 

You can't just machine down the stock Procharger spacer to work with the ATI Dampner. The spacer and blower crank pulley will not be properly centered. The Spacer is what is designed to center the blower crank pulley on the stock hub. If you machine down the stock spacer, the nub that origanally fit snug into the stock hub is way to small for the ATI dampner's center opening. Most think the bolts will also center it, but they won't, they will get it close, but you will have vibration as the rpm's rise.

PM me for more info on the spacer. I had a local company here make me one, and it works perfect.

I realized that was the reason why so many people have had issues cracking their ATI dampners with blowers, and also some even damaging their cranks.

Nick

 

Hey Nick

Do you have time to post a sketch of what is happening when this spacer is machined thinner?

Thanks,
-Scott.

 

Thanks Nick for the info. I called that guy today & left a message.