blocking heat riser for propane setup - Ford Truck Enthusiasts Forums



blocking heat riser for propane setup

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 06-16-2005, 12:23 PM
eastvanmikee eastvanmikee is offline
Junior User
Thread Starter
 
Join Date: Jan 2004
Location: Vancouver
Posts: 63
eastvanmikee is starting off with a positive reputation.
blocking heat riser for propane setup

I have a 79 bronco with a stock 400m wih a 425 impco propane setup.I remember reading somewhere that it is a good idea to block the "heat riser " to keep the intake manifold cooler, but I could not find any more info ie pictures or a more detailed description. I have the manifold off now to redo the head gaskets and would like to find out what is involved in doing this modification if it will gain performance or mileage..anyone know anything about it ??????
Reply With Quote
  #2  
Old 06-16-2005, 12:47 PM
Torque1st's Avatar
Torque1st Torque1st is offline
Posting Legend
 
Join Date: Sep 2001
Posts: 30,260
Torque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to behold
With your 400 (no M) it is easy to do. All you need is a bunch of those copper kitchen scrub pads available from the grocery store. Pack them into the heat riser passage in the manifold as far as you can from both sides with a metal rod. You can also stuff them into the head passages. I have heard there are also some gaskets that close the passage but they might rot out over time.
Reply With Quote
  #3  
Old 06-16-2005, 02:10 PM
eastvanmikee eastvanmikee is offline
Junior User
Thread Starter
 
Join Date: Jan 2004
Location: Vancouver
Posts: 63
eastvanmikee is starting off with a positive reputation.
wont the "scrubbies" still let heat/air through, or is the idea just to restrict the flow??
Reply With Quote
  #4  
Old 06-17-2005, 01:47 AM
Torque1st's Avatar
Torque1st Torque1st is offline
Posting Legend
 
Join Date: Sep 2001
Posts: 30,260
Torque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to behold
When you pack them in there there will be close to zero flow. You could detect flow with some instrumentation but it is as close to zero as you need.
Reply With Quote
  #5  
Old 06-17-2005, 09:44 AM
eastvanmikee eastvanmikee is offline
Junior User
Thread Starter
 
Join Date: Jan 2004
Location: Vancouver
Posts: 63
eastvanmikee is starting off with a positive reputation.
thanks, will try it
Reply With Quote
  #6  
Old 07-05-2005, 10:01 PM
yabbie55 yabbie55 is offline
New User
 
Join Date: Jul 2004
Location: australia
Posts: 20
yabbie55 is starting off with a positive reputation.
does this work with efi 351w
does it improve anything,


Quote:
Originally Posted by eastvanmikee
thanks, will try it
Reply With Quote
  #7  
Old 07-06-2005, 12:17 AM
Torque1st's Avatar
Torque1st Torque1st is offline
Posting Legend
 
Join Date: Sep 2001
Posts: 30,260
Torque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to beholdTorque1st is a splendid one to behold
Do not block the crossover with a gasoline engine with computer controls etc. This discussion was about a propane fueled vehicle. Check with the 351W engine forum for performance questions.

Last edited by Torque1st; 07-06-2005 at 12:23 AM.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Y Block Heat Riser Question fabieber 1948 - 1956 F1, F100 & Larger F-Series Trucks 17 11-16-2015 02:20 AM
Heat Riser fabieber 1948 - 1956 F1, F100 & Larger F-Series Trucks 1 03-01-2015 09:22 PM
1986 F350 351w heat riser gasket? Feenba 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 10 08-13-2012 08:11 AM
Who has blocked off thier heat risers? jonnybronco Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 6 10-04-2007 10:18 PM
heat risers anybody? memattfish 1968-2013 Full Size Vans 2 01-13-2005 02:48 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
425, ford, head, heat, propane, riser, setup

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 10:14 AM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send