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HP loss with dented headers

Printed From: The Ford Torino Page
Category: Model Specific Forum
Forum Name: General Automotive Technical Discussion
Forum Description: Technical Automotive discussion of anything not specific to mid-size Ford/Merc
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=15915
Printed Date: 28-March-2024 at 2:50AM
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Topic: HP loss with dented headers
Posted By: californiajohnny
Subject: HP loss with dented headers
Date Posted: 20-January-2017 at 4:50PM
check this out... dents are ugly BUT doesn't really matter Shocked

  http://www.youtube.com/watch?v=azPKIjxmmdU" rel="nofollow - https://www.youtube.com/watch?v=azPKIjxmmdU


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JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION



Replies:
Posted By: Power Surge
Date Posted: 20-January-2017 at 5:05PM
Wow! I'm a retired custom dyno tuner and I have to say I'm pretty surprised at that! 

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Sal Mennella
73 GTS 351 CJ
75 Cougar XR7
73 Ranchero - 5.0 Coyote swap - in progress
Past Torinos - 72 Gran Torino, 75 Gran Torino, 75 Elite


Posted By: torino335
Date Posted: 20-January-2017 at 6:25PM
so i guess if you dont care about dents in your header,it doesnt matter hp wise,


Posted By: Rockatansky
Date Posted: 22-January-2017 at 9:05AM
cam 236/242 @ .050" duration .553./.576" lift
 
4.25" x 3.75" = 400 ci
 
in-line valve arrangemnent
 
the cam isheavily biased to the exhaust side, could be the reason they didn't see the results everybody expected. back when i was a kid the cams were all intake biased, I'm really curious what engine/application triggered the change to the Ex bias? smaller tighter engine compartments dictating exhaust port exit angle might be a big part of it but i think the pendulum went a little too far
 
but the vid reinforces my belief that headers are ultra over efficient, all but the most exploited max effort builds do very well with moderate sized tubes
 
Johnny was this the same engine they used in the cast log / header swap test? still not a good indicator because they used aftermarket cast manifolds with a short primary runner rather than the worst factory logs that actually come stock. their cast manifold was a shorty header
 
found it https://www.youtube.com/watch?v=Y7_lSU3D0jw" rel="nofollow - https://www.youtube.com/watch?v=Y7_lSU3D0jw
again 221 / 247 crazy exhaust side bias, more than the other cam
 
and another header test  https://www.youtube.com/watch?v=rTlHEOE2Zp4" rel="nofollow - https://www.youtube.com/watch?v=rTlHEOE2Zp4


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72 GT Ute
   


Posted By: Power Surge
Date Posted: 22-January-2017 at 10:30AM
Originally posted by Rockatansky Rockatansky wrote:

cam 236/242 @ .050" duration .553./.576" lift
 
4.25" x 3.75" = 400 ci
 
in-line valve arrangemnent
 
the cam isheavily biased to the exhaust side, could be the reason they didn't see the results everybody expected. back when i was a kid the cams were all intake biased, I'm really curious what engine/application triggered the change to the Ex bias? smaller tighter engine compartments dictating exhaust port exit angle might be a big part of it but i think the pendulum went a little too far
 
but the vid reinforces my belief that headers are ultra over efficient, all but the most exploited max effort builds do very well with moderate sized tubes
 
Johnny was this the same engine they used in the cast log / header swap test? still not a good indicator because they used aftermarket cast manifolds with a short primary runner rather than the worst factory logs that actually come stock. their cast manifold was a shorty header
 
found it https://www.youtube.com/watch?v=Y7_lSU3D0jw" rel="nofollow - https://www.youtube.com/watch?v=Y7_lSU3D0jw
again 221 / 247 crazy exhaust side bias, more than the other cam
 
and another header test  https://www.youtube.com/watch?v=rTlHEOE2Zp4" rel="nofollow - https://www.youtube.com/watch?v=rTlHEOE2Zp4

After I watched it, I was wondering if the primary tubes were too big for that motor to begin with. 


-------------
Sal Mennella
73 GTS 351 CJ
75 Cougar XR7
73 Ranchero - 5.0 Coyote swap - in progress
Past Torinos - 72 Gran Torino, 75 Gran Torino, 75 Elite



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