Need heat riser edu. - 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-09-2008, 08:24 PM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,126
Wiki Edits: 1

Thanks: 0
Thanked 29 Times in 19 Posts
Need heat riser edu.

Can someone run me thru the function and sequence of operation of the heat riser and doors on the air cleaner. When they should open etc.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-09-2008, 08:52 PM
Jmark's Avatar
Registered User
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,815
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
the heat riser is usually mounted on one side of the exhaust, right were the manifold connects to the pipe. On older vehicles, it has a thermostatic spring that will open the valve once it warms up. It's closed cold to help force the exhaust through the passage in the head and into the passage in the intake, to help heat up the mixture and carb. Newer cars may have a vacuum operated one or an electric one.


the door in the air cleaner snorkel is usually controlled by vacuum and that hose goes through a thermal vacuum switch located (usually) in the thermostat housing. The metal tube, or pipe that does down from the snorkel to the exhaust manifold draws warm air into the carb, again helping the mixture and warming the carb. This is expecialy helpful if you experience carb frosting. (not to be confused with chocolate frosting!)
Once the water temp reaches the rating on the TVS, it will change the signal and the door will change position and let in either under hood air or, if you have a snorkel that goes to the core support, fresher outside air.
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:
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
340 six pack Mopar manifold heat riser; block it? F&J Engine 3 08-19-2008 06:31 PM
Heat riser, crossover blockage ??? Augusto Engine 1 12-03-2007 07:18 PM
how to run heat riser tubes? matt167 Engine 1 09-12-2006 05:49 PM
Blocking off heat riser sbc intake Eric64 Engine 6 05-13-2005 08:25 AM
do i need the heat riser akm Engine 1 05-21-2003 03:45 AM


All times are GMT -6. The time now is 05:59 PM.


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.