Engine Build Time
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I read a lot of threads on porting and a lot of the porters think that being a little rough there is actually a good thing - I have an aerospace degree but never really used it too much but I know on airplanes they will put strips and other little protrubences that disturb the air to keep it flowing tight to the wing and not separate and create a ton more drag. To the finger, it does not feel very rough, but I have only seen just a couple of heads that have been worked on.
Last edited by HD Pilot; Feb 7, 2014 at 08:53 PM.
Thread Starter
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
Are you referring to the seat pressure? Good question if so, I meant to say something: AV&V springs, max recommended cam lift .600", 165 lb seat pressure. Normally AMS and I suspect a lot of other shops like to use bigger/stronger springs that cover more cams but after talking to TR at Tman, he told me to try to get something with around 155-160 lbs of seat pressure. Eric at AMS was great about ordering just what I wanted otherwise I would have been using springs with 178 lbs of seat pressure - creates ineffiency.
Thread Starter
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I believe 2012 was first year for Auto Compression Releases? Had to buy a special tool to deal with those.
HDF Community Team
Joined: Jun 2008
Posts: 4,756
Likes: 951
From: Out West
Enjoying the read, thanks!
Club Member
Joined: May 2006
Posts: 14,564
Likes: 9,223
From: the 50s & the 60s
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"roughness" is definitely a good thing in the ports. there is no not about that.
I guess I should have typed a few more words into my previous post.
said - rough looking job, but should do the trick.
should have said - to my eye the workmanship is a rough looking job, but should do the trick..
velocity is important as well.
easy to over do the throttle body - losing velocity.
are you using compression release?? 10.5 is borderline to must have.
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intake port from my 95 inch motor
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intake port from my 121 inch motor
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exhaust port from my 121 inch motor
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Really looking forward to twisting on it
I read a lot of threads on porting and a lot of the porters think that being a little rough there is actually a good thing - I have an aerospace degree but never really used it too much but I know on airplanes they will put strips and other little protrubences that disturb the air to keep it flowing tight to the wing and not separate and create a ton more drag. To the finger, it does not feel very rough,
but I have only seen just a couple of heads that have been worked on.
I read a lot of threads on porting and a lot of the porters think that being a little rough there is actually a good thing - I have an aerospace degree but never really used it too much but I know on airplanes they will put strips and other little protrubences that disturb the air to keep it flowing tight to the wing and not separate and create a ton more drag. To the finger, it does not feel very rough,
but I have only seen just a couple of heads that have been worked on.
.
.
"roughness" is definitely a good thing in the ports. there is no not about that.
I guess I should have typed a few more words into my previous post.
said - rough looking job, but should do the trick.
should have said - to my eye the workmanship is a rough looking job, but should do the trick..
velocity is important as well.
easy to over do the throttle body - losing velocity.
are you using compression release?? 10.5 is borderline to must have.
.
.
intake port from my 95 inch motor
.
.
.
.
intake port from my 121 inch motor
.
.
.
.
exhaust port from my 121 inch motor
.
.
.
.
.
HDF Community Team
Joined: Jun 2008
Posts: 4,756
Likes: 951
From: Out West
Ports looks so nice you'd think they were worked on by a German Dentist!
A real one, not Laurence Olivier in Marathon Man.
A real one, not Laurence Olivier in Marathon Man.
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Thread Starter
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
Well I guess I will find out soon enough about my headwork. I am a big believer in CNC machining and do not see an advantage to a sharp ridge in the intake/exhaust ports over a more rounded ridge; you do not see sharp ridges like that used on subsonic airplanes on airfoils, elevators, etc. but as said before I am very new to the world of headwork.
