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HP loss with dented headers

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californiajohnny View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Topic: HP loss with dented headers
    Posted: 20-January-2017 at 4:50PM
check this out... dents are ugly BUT doesn't really matter Shocked

 https://www.youtube.com/watch?v=azPKIjxmmdU
JOHN
74 GRAN TORINO S&H CLONE
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77 CELICA CUSTOM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Power Surge Quote  Post ReplyReply Direct Link To This Post 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! 
Sal Mennella
73 GTS 351 CJ
75 Cougar XR7
73 Ranchero - 5.0 Coyote swap - in progress
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Post Options Post Options   Thanks (0) Thanks(0)   Quote torino335 Quote  Post ReplyReply Direct Link To This Post Posted: 20-January-2017 at 6:25PM
so i guess if you dont care about dents in your header,it doesnt matter hp wise,
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post 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
 
again 221 / 247 crazy exhaust side bias, more than the other cam
 


Edited by Rockatansky - 22-January-2017 at 9:12AM
72 GT Ute
   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Power Surge Quote  Post ReplyReply Direct Link To This Post 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
 
again 221 / 247 crazy exhaust side bias, more than the other cam
 

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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