where does the coolant go? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



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

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 07-09-2019, 11:34 AM
ogre's Avatar
the 'Duracell Project'
 
Join Date: Nov 2009
Location: Motown
Posts: 2,209
Wiki Edits: 0

Thanks: 0
Thanked 517 Times in 407 Posts
obviously with the thermostat closed the coolant just circulates thru the motor
thermostats open as heat hits circulates around the bottom of the thermostat
it can open 0 to 100%, varies according to temps


    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 07-09-2019, 01:38 PM
Tim C's Avatar
Registered User
 
Join Date: Aug 2003
Location: Fayetteville, NC, USA
Age: 39
Posts: 373
Wiki Edits: 0

Thanks: 47
Thanked 107 Times in 97 Posts
Some engines leave the bypass open all the time, like said above a small amount of coolant may flow but not enough to make any difference, since most will take the path of least resistance, the large radiator hose.

Some newer engines block off the bypass, that's what the extra spring loaded disc below the thermostat is for. If the thermostat is closed the disc allows coolant to flow through the bypass. As the stat opens the disc pushes against the bypass opening and seals it off.

One engine that will get a lot of folks in trouble is the old Ford 351c, 351m, or 400s. They will take what looks like the same stat as every other Ford engine or even the Chevy small blocks, but there is a bypass port just below it, and the correct stat has a small brass "top hat" on the part of the thermostat that contains the wax that moves it open and closed. If you use the regular stat it'll idle fine but run hot at speed because the open bypass only let's the coolant flow around the front two cylinders. The correct stat the top hat goes into the bypass port to close it and causes the coolant to circulate properly.
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 07-11-2019, 05:06 PM
Registered User
 
Join Date: Jun 2012
Posts: 11
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
BBC Bypass Feature

Someone mentioned the bypass on a BBC earlier in this thread. Some folks plug the intake outlet and the water pump inlet in hopes of decreasing the likelihood of overheating in traffic on a hot summer day. All things being equal, plugging those holes does force most if not all the hot coolant into the radiator. You'd be amazed at how much water moves through that little BBC bypass hose, and none of it goes into the radiator to shed its heat. It goes right back into the engine just as hot as when it came out. What must be done when plugging that bypass is to replace the stock t-stat with one that has 3 3/16" holes in the top hat of the t-stat (or drill those holes yourself in a stock high flow t-stat). Stewart Components offers those drilled t-stats. Those will hold back enough coolant to bring the motor's operating temp up quicker. Of course the t-stat will fully open when the motor's temp causes it to do so, and ALL the water will enter the radiator. I run a 454 BBC in my '32 Ford roadster and a 502 BBC in my '41 Willys, both of which have those modifications. Never had an overheating problem in either, and I reside in a hellhole called Texas.
Reply With Quote Quick reply to this message
 
  #19 (permalink)  
Old 07-12-2019, 04:24 AM
55 Tony's Avatar
Registered User
 
Join Date: Nov 2018
Location: Cocke County, TN
Posts: 981
Wiki Edits: 0

Thanks: 128
Thanked 162 Times in 143 Posts
I shrunk my bypass fittings and hose down to about 3/8" for that reason. Didn't seem to make any difference in cooling, but I don't have a cooling problem either.
__________________
Young enough to learn ... too old to remember.
Reply With Quote Quick reply to this message

Recent Engine 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:
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:
Insurance
Please select your insurance company (Optional)

Log-in



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



All times are GMT -6. The time now is 12:05 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, 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 © 2019 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.