Are you guys using a 108" belt with a 3.33" pulley on a vortech?

[dwtjr3]

I have a s trim with a 3.33" and I put a new tensioner and belt on at the same time and at first the belt seemed alright and on the dyno I hit 11psi with it. and now I am hitting 8-9 max.

Now about a year later I can push my belt by hand and hear the play in my tensioner, so I plan on doing another tensioner.

But I have talked to a few experienced centri owners and they say to find a belt that keeps the tensioner maxed out at all times.

So my question is, what belt and what size belt are you guys using with a 3.33" blower pulley and all the other pulleys are stock And also where did you get your belts from?

 

[01yellercobra]

How many miles have you put on that belt? Superchargers are harder on belts. I prefer to keep the tensioner about the middle of it's travel. If you run a belt that's so short the tensioner is against the stop all the time you'll damage your front main bearing.

 

[dwtjr3]

I have about 7k miles on the belt if that.

It just confuses me because reading the pulley combo thread I see people running 3.33" with other pulleys being stock and one used a 112" belt and another used a 107.5" and they were both new edge 2v's

And I am running a cheap auto zone belt, I couldnt find a gates belt that was 108"

 

[01yellercobra]

AC-Delco also carries a heavy duty belt. I get mine from Amazon. If the 108 puts the tensioner about mid travel then it's the right length IMO.

I know the routing changed in 01 for the 4V. If the two cars you're looking at are different years that might explain the belt length difference.

 

[dwtjr3]

yeah the routing has to of changed, AC-delco has some good belts as well?

 

[1996MysticSnake]

I run a 112.5 on my 96 cobra with a thump racing tensioner fits perfect and no slip at all

 

[dwtjr3]

What brand belt do you have?

 

[1996MysticSnake]

goodyear gatorback

 

[dwtjr3]

ok thank you, I have to try and find a belt. I am struggling to find a HD belt 108" in 6 rib, theres a bunch of 8 rib belts.

 

[gixxer1kr]

I'm having good luck with gator back 4061080 which I believe is 108 . After my first belt toss I also bought a new tensioner at napa. I do highly recommend
throwing in a small pulley in between the alternator and crank. That's the problem spot . It's the longest spot that flaps around the most at high revs.

 

[Stanger00]

I have about 7k miles on the belt if that.

It just confuses me because reading the pulley combo thread I see people running 3.33" with other pulleys being stock and one used a 112" belt and another used a 107.5" and they were both new edge 2v's

And I am running a cheap auto zone belt, I couldnt find a gates belt that was 108"

Not all new edge 2 valves are running a single bolt tensioner. Some have switched to 3 bolt tensioner. The single bolt tensioner uses a shorter belt and the 3 bolt uses a longer one.

The 108 should be fine for your application. Buy an OEM tensioner or get the Thump Racing Tensioner.

I ran a 3.1 pulley on my car and it was consistent with 10-12 psi at 6k rpms. I didn't think a 3.33 would make that much boost.

 

[dwtjr3]

on the dyno I hit 11 psi with the powerpipe so that what I am going off of, I know I wont make 11psi every day tho. And you dont like the tensioners from auto zone?

And thanks or the part number gixxer, I will look into it.

 

[dwtjr3]

Just ordered that belt gixxer, thanks for the part number

I will keep everyone posted, I plan to machine a auxiliary idler with a bolt to help keep tensioner better, when I get around to it I will post pictures.

 

[gixxer1kr]

Not sure on the autozone tensioner but napa carried Gates tensioners reboxed by Napa. Andwhat I did was remove the timing bolt in the center of the crank and alternator and put a longer one in place with a spacer and pulley. Throws a nice kink and puts pressure there.