TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - "Dogleg" - Mis-Applied ? - Source Document
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

"Dogleg" - Mis-Applied ? - Source Document

 Post Reply Post Reply
Author
Message
PHAT69AMX View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/07/2007
Location: West Virginia
Status: Online
Points: 3981
Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Topic: "Dogleg" - Mis-Applied ? - Source Document
    Posted: Oct/22/2009 at 12:54pm
Image from AMX-390 V-8 Engine SAE papers,
top right corner of page 19.
Plainly uses "dog-leg" in describing Port Ceiling Contour changes,
but not the exhaust port shape as seen on the outer casting ?
Odd, dashed / solid lines show ceiling changes to the manifold, rather than the cyl. head ?
Port Floor Change from Concave to Convex in the cyl. head is also visible.
 
Back to Top
whizkidder View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum


Joined: Mar/03/2008
Location: North Georgia
Status: Offline
Points: 2965
Post Options Post Options   Thanks (0) Thanks(0)   Quote whizkidder Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 1:20pm
Originally posted by PHAT69AMX PHAT69AMX wrote:

Plainly uses "dog-leg" in describing Port Ceiling Contour changes,
but not the exhaust port shape as seen on the outer casting ?
 
Kevin:  I think you're right -- the "dog-leg" referenced appears to be in the ceiling of the port from the valve stem toward the outer manifold mating surface.  Funny they decided to change the port shape at the manifold mating surface also, with no reference in the text as to why.  "Longitudinal" to me means front to back, so that would seem to rule out the water jacket as a reason for the odd exterior port shape -- perhaps it was to retain the bolt holes in their original locations, while increasing the overal cross section of the port?
Ron Frost
marne1ancient @ gmail.com
910 nine two two 0563

"There is no limit to what a man can do, so long as he does not care a straw who gets credit for it. Charles Montague
Back to Top
SKeown View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/30/2009
Location: Texas
Status: Offline
Points: 3085
Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 1:50pm
 
 Head porters have long known not to tamper with the floor of the exhause on "dog leg" heads.
 
 SKeown
Back to Top
billd View Drop Down
Moderator Group
Moderator Group
Avatar
Forum Administrator

Joined: Jun/27/2007
Location: Iowa
Status: Online
Points: 28553
Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 1:52pm
I think Steve brought  this up a couple of years ago if I recall..............
Back to Top
PHAT69AMX View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/07/2007
Location: West Virginia
Status: Online
Points: 3981
Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 2:41pm
As used in the paragraph of text that goes along with Figure 19
is the section indicated what's being referred to as the "dog-leg" section ?
 
Back to Top
whizkidder View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum


Joined: Mar/03/2008
Location: North Georgia
Status: Offline
Points: 2965
Post Options Post Options   Thanks (0) Thanks(0)   Quote whizkidder Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 2:54pm
That's my read. 
Ron Frost
marne1ancient @ gmail.com
910 nine two two 0563

"There is no limit to what a man can do, so long as he does not care a straw who gets credit for it. Charles Montague
Back to Top
74Bubblefender View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jun/29/2007
Location: The AMC form
Status: Offline
Points: 2409
Post Options Post Options   Thanks (0) Thanks(0)   Quote 74Bubblefender Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 5:11pm
Take your finger in different year heads and you can feel the difference.
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564
Back to Top
PHAT69AMX View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/07/2007
Location: West Virginia
Status: Online
Points: 3981
Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Oct/22/2009 at 5:59pm
Yeah, exhaust port floor contour difference is obvious with a finger in the port.
Any noticeable  port ceiling difference between the two,
or do early and late AMC heads both share
the same exhaust port ceiling "dog-leg" section ? Confused
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.110 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or