Heater Hose Sizing? - 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> General Rodding Tech
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 12-24-2010, 04:25 PM
Registered User
 
Last photo:
Join Date: Dec 2005
Location: Dallas Oregon
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Heater Hose Sizing?

OK, anybody used 1/2" heater hoses instead of the more common 5/8" or 3/4" ones?
Reason I ask is that I want to route heater hoses on my Ranchero "down under" alongside the oil pan and then back up to the firewall. Using 1/2" (-8) hoses would make it a bit easier and neater. As the cabin on this car is pretty small, I'm guessing that there might be enough flow with the smaller hoses..

thanks,

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-24-2010, 06:13 PM
MARTINSR's Avatar
Brian Martin,Freelance adviser
 
Last photo:
Join Date: Jun 2004
Location: San francisco bay area
Age: 55
Posts: 12,978
Wiki Edits: 0

Thanks: 696
Thanked 1,062 Times in 947 Posts
That makes me go hmmmmmmmmmmm never thought about it. I can't imagine that there would be a problem, but then again, why do they make it 5/8 or 3/4?

One way would be to use metal tubing, the outside diameter would be smaller than the 1/2" rubber with the inside at 3/4 or so.

Brian
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-24-2010, 06:36 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,762
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Makes me go Hummmmmmmm also Brian, But they do make automobile 1/2 inch heater hose and the adapter also to go from 3/4 or 5/8/ to 1/2 . I don't really see a problem either but never thought about it till i seen this thread.




Cole
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-24-2010, 06:54 PM
matts37chev's Avatar
I don't understand?
 

Last journal entry: this is only a test
Last photo:
Join Date: Jan 2009
Location: Shelton,Wa.
Age: 45
Posts: 2,420
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 4 Posts
the only problem i can think of, is your heater wouldn't blow as hot if the fan was on high.
the rear heat in the wifes 4runner is feed by some pretty small lines!
i think it should work ok.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-24-2010, 11:15 PM
Registered User
 
Last photo:
Join Date: Dec 2005
Location: Dallas Oregon
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the thoughts. The OEM setup had twin steel tubes on top of the engine with hoses on either end. Going down and under in a tidy manner would mean winding the plumbing down around the alternator area. Just think that using -8 hoses would make the job a little nicer. IIRC, those steel tubes were pretty small diameter and one of the coolant ports on the engine is 3/8" NPT, which would seem to be a flow restrictor in itself.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-24-2010, 11:17 PM
Registered User
 
Last photo:
Join Date: Mar 2009
Location: Burton, MI
Posts: 781
Wiki Edits: 0

Thanks: 34
Thanked 15 Times in 14 Posts
my 86 astro van had an auxillary heater in the back seat.. it was fed with 1/2" steel pipe....
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-26-2010, 03:16 AM
bentwings's Avatar
bentwings
 
Last photo:
Join Date: May 2002
Location: St.Paul, Minn
Age: 72
Posts: 1,788
Wiki Edits: 0

Thanks: 0
Thanked 14 Times in 13 Posts
I think you could use 1/2 inch hoses with and adaptor at the core if need be. I thought about it just recently but went with #10 AN fittings on the water pump and 5/8 hoses. I should have thought harder. I had to make a special wrench to tighten the fittings. Now I have another tool to carry with my in an already overstuffed tool box.

I have driven in 15 deg weather but I still only use 2nd speed on the fan so there is plenty of heat. I don't even have a head liner yet.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-26-2010, 08:51 AM
Registered User
 
Last photo:
Join Date: Dec 2005
Location: Dallas Oregon
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Well, the word from St. Paul counts for a bunch, especially as it concerns heaters!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-27-2010, 10:09 AM
1971BB427's Avatar
Registered User
 

Last journal entry: Latest changes
Last photo:
Join Date: Dec 2010
Location: Portland
Posts: 1,410
Wiki Edits: 0

Thanks: 11
Thanked 207 Times in 178 Posts
I'm running 1/2" heater hoses on my hotrod and no problems at all. Lots of heat.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 12-27-2010, 10:13 AM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,762
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Quote:
Originally Posted by 1971BB427
I'm running 1/2" heater hoses on my hotrod and no problems at all. Lots of heat.
The proof is in the pudding.


Cole
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 12-27-2010, 10:36 AM
Registered User
 
Last photo:
Join Date: Mar 2009
Location: Burton, MI
Posts: 781
Wiki Edits: 0

Thanks: 34
Thanked 15 Times in 14 Posts
Quote:
Originally Posted by bentwings
I think you could use 1/2 inch hoses with and adaptor at the core if need be. I thought about it just recently but went with #10 AN fittings on the water pump and 5/8 hoses. I should have thought harder. I had to make a special wrench to tighten the fittings. Now I have another tool to carry with my in an already overstuffed tool box.

I have driven in 15 deg weather but I still only use 2nd speed on the fan so there is plenty of heat. I don't even have a head liner yet.

A Mexican Socket Set wrapped in masking tape does the job nicely.. (that's an adjustable wrench to most people)
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 12-27-2010, 12:10 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 2 Times in 2 Posts
For the most part, you can use whatever lines you want. Depending on the engine, some use the heater core as the thermostat bypass and restricting flow may or may not cause it to overheat just a tad before the thermostat opens.

Most engines have a built in bypass under the thermostat or in the water pump, and in that case you can use 1/8" hose if you want It will just give the heater core less heat
Reply With Quote Quick reply to this message

Recent General Rodding Tech posts with photos

Quick Reply
Message:
Options

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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
Heater hose bulkhead lt1tyrell General Rodding Tech 4 03-25-2010 09:12 PM
heater hose old dog 1 Hotrodding Basics 4 10-10-2009 09:47 AM
Heater hose Connectons fosterdl Engine 2 02-09-2008 01:36 PM
What is this in my heater hose? (Picture) Ghetto Jet Engine 10 11-16-2004 11:15 PM
Heater Hose Killer 41chev Engine 15 01-27-2003 08:16 PM


All times are GMT -6. The time now is 12:08 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.