|07-02-2012 05:57 PM|
|07-02-2012 03:07 PM|
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 01:28 PM|
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 08:45 PM|
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 06:21 PM|
Kinda like this below.
|07-01-2012 05:46 PM|
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 10:21 AM|
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.
|07-01-2012 07:18 AM|
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.
|07-01-2012 12:22 AM|
Blower pulleys configuration?
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!