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How to ID the heavy duty 300 six

 
  #16  
Old 06-07-2018, 04:02 PM
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Originally Posted by 1986F150six View Post
I have wondered why Ford did that [open heat riser] on the HD engine? The only thing that makes sense to me is that these engines were made to run @ 3,000+ RPMs and maybe [?] the temperature was kept at a minimum with the extra exhaust gas flow.
I've often wondered that too. You'd think it'd be even hotter running at higher RPMs.
Even if not, they weren't all going to be operating at high RPM all the time. There's stop and go situations in ANY application.
 
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Old 06-07-2018, 05:16 PM
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Maybe they want it to run hot enough to vaporize the fuel. With the low compression maybe it needed all the help it could get. Who knows, I'm not an engineer.
 
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Old 06-10-2018, 09:44 AM
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Originally Posted by applebaggins View Post
They mention the crank a little earlier... shown below...

Bless You exactly what "Gramps" has been searching for. Can you please respond with the exact Ford publication title/date this info came from? I need to acquire a personal copy for our very extensive cylinder head Development Dyno program.
Many Thanks, Bruce Sizemore
 
  #19  
Old 06-11-2018, 07:51 AM
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Originally Posted by worldchampgramp2 View Post
Bless You exactly what "Gramps" has been searching for. Can you please respond with the exact Ford publication title/date this info came from? I need to acquire a personal copy for our very extensive cylinder head Development Dyno program.
Many Thanks, Bruce Sizemore
Hi, Gramps. This is from the 1978 Truck Shop Manual. It's a five-volume set, but this is from volume two. Here's an extract of the 4.9L 300 section. You won't be able to search the text, but it should still be readable. https://ufile.io/h1r9k Just a warning, that link is only good for 30 days!
 
 
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