high flow water pump - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- 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
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 10-05-2012, 10:30 PM
Registered User
Last photo:
Join Date: Jan 2012
Posts: 64
Wiki Edits: 0

Thanks: 0
Thanked 6 Times in 4 Posts
high flow water pump

I am changing out my water pump on a ford 302 engine; this is for street use. I see "high flow" pumps advertised. I ordered a stock w/pump from NAPA and the impeller is 3-7/8" in diameter. On a high flow w/pump that I was interested in, the impeller is 3-1/2" in diameter.
1- is the impeller the main determinant of higher volume flow or
2- does the design and materials (billet, etc.) make more difference?

I would think that since the pulley (and hence rpm) is the same for all units, that the larger impeller is the most important consideration for street (stop and go) driving and that in a race situation, a smaller impeller would be more appropriate for high revs.

Can someone please educate me so I know what to look for?


Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 10-06-2012, 01:53 AM
techinspector1's Avatar
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 75
Posts: 15,341
Wiki Edits: 326

Thanks: 1,504
Thanked 2,023 Times in 1,563 Posts
Jugger, you've made me realize that I know little or nothing about high-flow water pumps even after being in this hobby for over 50 years.

I will share with you what makes sense to me. Filling the pump cavity with as much impeller as is possible makes sense. Making sure the impeller is a tight fit on the driveshaft makes sense. Using a solid sheet metal backing plate on the impeller to prevent water from circulating inside the pump cavity makes sense. Possibly increasing the drive ratio off the crank makes sense.
I figured out one time that the pump is driven at about 1.2 to 1.3 times crank speed on OEM applications. Maybe a guy could try 1.4 and see what happens.
Color me fairly clueless.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-06-2012, 03:44 AM
Registered User
Join Date: Dec 2006
Location: Texas, Coast
Age: 56
Posts: 327
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 5 Posts
My buddy put one on his Burb well when seeing the better flow I said let me get one as well because one I have underdrive pulleys and this stop & go traffic here in Houston sure can get to ones engine now I have had them on my truck for a while and im super happy with them.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-06-2012, 11:23 AM
Registered User
Last photo:
Join Date: Jan 2012
Posts: 64
Wiki Edits: 0

Thanks: 0
Thanked 6 Times in 4 Posts
High Flow Water Pump

Thanks for the comments. I guess a common sense approach may be the answer although one would think that the angle of the vanes on the impeller could be at issue besides size, however, none of the pumps that I see advertised amplify on design and I have nothing to compare my stock pump to, so I guess I have to take the word of the advertisers coupled with common sense. Taking that one step further, I would surmise that increasing the turning ratio might prematurely burn out the bearings if it turned too fast all the time (in traffic) and like a marine propeller, could cause cavitation or other unintended consequences.

I know there are experts out there who can shed some light on this issue and would appreciate their insight.


Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
High flow oil pump sexypizzaman Engine 5 09-04-2007 11:08 PM
High flow water pump for SBC 350 75gmck25 Engine 7 05-22-2007 03:42 PM
reverse flow water pump radshell Engine 2 05-23-2005 10:03 AM
Update on Hi-Flow water pump Kaylah General Rodding Tech 7 10-25-2003 11:12 AM
High Flow Water pump??? Dave E Shank Engine 1 11-20-2002 07:25 PM

All times are GMT -6. The time now is 01:49 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 Hotrodders.com 1999 - 2012. All Rights Reserved.