Is the MMS pulley an 8 Rib ?

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Jul 31, 2003 | 07:36 PM

GMC SKI

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From: toronto

Is the MMS pulley an 8 Rib ?

Hey guys is the MMS Crank pulley 8 rib ?
Doesn't say on the web site
Anyone have any good pictures of it ?
It's going to go into my truck and issues with that
I'm not sure that the crank pullies are any different
thanks

Jim

Jul 31, 2003 | 07:37 PM

nbm00ws6

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From: Englewood, Ohio

Re: Is the MMS pulley an 8 Rib ?

Nope it's a 6 rib

Jul 31, 2003 | 07:40 PM

GMC SKI

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From: toronto

Re: Is the MMS pulley an 8 Rib ?

With it on and a 4" pulley what kind of boost should i see shifting at 6200 rpm with my P1sc Charger any ideas ?
I'm currently getting some belt slip issues with my 3.6" pulley and i'm looking at my options
I think it's 8 Rib time ..

Aug 1, 2003 | 03:42 PM

Black LS1 T/A

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From: Raleigh, NC

Re: Is the MMS pulley an 8 Rib ?

Pic:

Per Mike Morgan:

Quote:

Here is a general rule on boost with the crank pulley.
Here are the conditionals:
1. Stock displacement.
2. D1SC supercharger
3. Boost measurements at 6200RPM

4.50" pulley- 7 to 8 psi
4.38" pulley- 8 to 9 psi
4.25" pulley- 9 to 10 psi
4.10" pulley- 10 to 12 psi
4.00" pulley- 12 to 14 psi
3.85" pulley- 14 to 16 psi

If you run a P1SC then take about 2 to 3psi off these numbers.

Here is a pulley conversion from your old to new
Pulley w/ stock crank ------- Pulley with MMS crank

3.20" - 4.25"
3.40" - 4.50"
anything bigger than 3.60" with your current setup would not require a crank pulley switch if unless you want to run more boost. I believe the 3.6" pulley is a 4 to 5 psi setup.

Aug 1, 2003 | 09:27 PM

GMC SKI

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From: toronto

Re: Is the MMS pulley an 8 Rib ?

My new setup will be a 372 ci iron block with some absolute 6L blower heads and a few other goodies
Gettin a custom intercooler done aswell
i just need some options on my belt setup
Guess i have to call ASP for a cutom setup ..
is there anyone else that can do it ?

Aug 2, 2003 | 08:07 PM

BIGBOS

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From: Chi-Town, IL

Re: Is the MMS pulley an 8 Rib ?

On my current 372 setup I'm running a ASP 7.85" 8 rib crank pulley, and a 3.3" 8 rib reichard racing pulley, I'm having problems destroying belts though, the ATI brackets are flexing, there for I'm going to have Chris Sikora (Z9's) custom fabricate something to keep the brackets from flexing....

I'm also looking into a better filter setup for the ATI, the stock supplied K&N cone is very restrictive, when taken off my car it was an instant 2-3psi gain....so I have speed Inc. hunting down a bigger cone to put on there...

Aug 2, 2003 | 10:26 PM

GMC SKI

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From: toronto

Re: Is the MMS pulley an 8 Rib ?

The metal on the bracket I have isn't very hard it will flex when i push on the blower
I'm going to get my re-done out of real steel that's going to be a little thicker than what ati provides with the kit
this should fix any potential flex issues i'm going to have
How much did asp charge you for your crank pulley ?what are the reichard pullies worth?
BIGBOS what cam are you running ?