Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Blower pulleys configuration?
User Name
lost password?   |   register now

Thread: Blower pulleys configuration? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
07-02-2012 04:57 PM
Originally Posted by F-BIRD'88 View Post
Most people end up ditching the P/S and install a manual steering box.
Yep, that's what I did. Sucks, but I guess I can live with the trade off.
07-02-2012 02:07 PM
68NovaSS I was able to run two groove pulleys on a short WP and crank, behind the lower blower pulley on an 8-71 Weiand, SBC. I used ZOOPS adjustable brackets for the alt and power steering. The alt bracket is actually a high mount ZOOPS turned upside down and clearanced for the valve cover front. my configuration is wp/alt/crank and wp/ps/crank.

The outside V-Belt is pretty close to the blower belt, about 1/4 inch, but does clear. The pictures here are hard to identify, and I have the motor apart right now.
07-02-2012 12:28 PM
fitman FBird88-can I still run my alt, ps, water, & hb with my single groove pulley that I already have? Is it bad to have that many pulleys running off 1 belt?
07-01-2012 07:45 PM
fitman thanks NOlowrider for your post. (BTW...gorgeous motor!)
I guess i'll prob have to go with a single belt set up that'll work PS, water, alt, & harmonic balancer. As i mentioned above, my 31-tooth lower pulley has a single groove.
07-01-2012 05:21 PM
Originally Posted by fitman View Post
Where can I find a 31-32 pulley with a triple groove?
You are not going to find a blower pulley with any grooves for the accessories. (water pump. alternator, PS pump, etc). This is where the tricky part comes in. If you want a three groovelower acc pulley you have to offset that extra distance with a longer blower snout. Meaning, if you have 3 grooves on the lower acc pulley then the blower snout will have to be longer than the snout for 1 or 2 groove lower acc pulley. Hope I didn't confuse you. You basically have to set the blower on the engine, hang the blower belt on the blower upper pulley and see how far it is from the harmonic balancer.

Kinda like this below.
07-01-2012 04:46 PM
fitman Thank you gentlemen for all your responses.
I definitely have the 1/2" old style/square pulleys.
Where can I find a 31-32 pulley with a triple groove?
07-01-2012 09:21 AM
NOlowrider If your pulley's are 1/2" pitch (square cog pattern) with a 39 upper and a 31 lower you will be at roughly 20% underdriven. I don't think you will make your target boost with a 20% under drive. If you swap them to 39 lower and 31 upper you will be at roughly 25% overdriven, which I don't think is a good idea on a bascially stock engine. Most people run a 10% underdrive which would be a 34 lower and a 38 upper. I would shoot for that combo to get your target boost. The pic below is a 8mm pulley.

1/2" pitch


07-01-2012 06:18 AM
68NovaSS Welcome to the board.

Here are Weiands' tech sheets, these blowers come underdriven to make 5 to 7 pounds. You have the older style it looks like, 1/2" pitch pulleys vs. the 8 mm. I think your one pulley must be 32 not 31, unless it's not a Weiand part.
06-30-2012 11:22 PM
Blower pulleys configuration?

Hello everyone!
I have a 78 vette with a basic stock/cast 350. Recently I obtained a weiand 6-71 blower w/ 2-600 holleys. My question is can I run this blower underdriven at just 5-7 lbs? My mechanic is a forced induction freak. He assures me that i'll be ok with running the blower on my current engine as long as i dont get "foolish" with it. So my question to you all is what blower pulleys do I need to run to reach my target boost of 5-7lbs?
The blower came with a 39-cog upper pulley and a 31-cog lower. The person I purchased this from advised me that pulley configuration is what Im looking for, just need some confirmation from you guys first please.
Any help is greatly appreciated!

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 01:28 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.