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Exhaust Dyno Charts
1 Attachment(s)
For those interested in the results of various exhaust systems this is a chart that I have. I don't know who did the dyno results but there is some good info here!
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Interesting that these numbers on "Torque Only" are just about in line with what we found in all of our header and manifold dyno testing and pretty close to what Bob at Full Throttle found in his tests! I will find and post the Dana manifold header tests as well so people can make that comparison also for about the same engine size and horsepower levels. Its obvious from these results that individual long tube headers or manifolds make more power and torque than short passage or tube manifolds and headers!
Did this Fountain testing ever show and list the corrected horsepower levels also?? Best Regards, Ray @ Raylar |
Yes- There is 6 pages of data. Click on the arrow on the top of Adobe Reader. I also have it in Excel format but OSO can't up load excel files so I converted it to pdf. The way it looks to me the higher the engine revs the better the long tubes work. This is why I sold my stainless marine manifolds and bought Eickerts. My engine makes peak power around 6k so I felt is was worth the change. I'm interested to see the Dana results.
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OK now I can navigate thru all the pages, sorry my problem. Brain Fart!
Curious if this was an HP500 carb engine or a 540 Bulldog or perhaps a HP500efi ??? Do you have that engine spec. data they were using on these tests?? Like to see that also. Best Regards, Ray @ Raylar |
Originally Posted by Raylar
(Post 3362457)
OK now I can navigate thru all the pages, sorry my problem. Brain Fart!
Curious if this was an HP500 carb engine or a 540 Bulldog or perhaps a HP500efi ??? Do you have that engine spec. data they were using on these tests?? Like to see that also. Best Regards, Ray @ Raylar I sent a copy in excel to you, which should make it easier to navigate. As to the engine specs, I think this was done on an HP500 carb but I'm not 100% on that. |
I see this question recently surfaced on BCK's post. Instead of posting this info there and derailing his post, I'll just bring this old post back to the top.
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Originally Posted by endeavour32
(Post 4439841)
I see this question recently surfaced on BCK's post. Instead of posting this info there and derailing his post, I'll just bring this old post back to the top.
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I can guarantee you I'm not testing any headers. Until my CMIs break...
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Originally Posted by bck
(Post 4439869)
I can guarantee you I'm not testing any headers. Until my CMIs break...
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Those cast thunder n lightning manifolds kick ass.
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Originally Posted by hogie roll
(Post 4439879)
Those cast thunder n lightning manifolds kick ass.
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Originally Posted by hogie roll
(Post 4439879)
Those cast thunder n lightning manifolds kick ass.
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Good stuff. Id like to see this type of testing done on say a 700hp engine like bcks, or say some 800-900hp supercharged combos. I bet theres alot of guys building bigger power stuff these days, and them bolting on exhausts that are choking the engines down.
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Originally Posted by MILD THUNDER
(Post 4439899)
Good stuff. Id like to see this type of testing done on say a 700hp engine like bcks, or say some 800-900hp supercharged combos. I bet theres alot of guys building bigger power stuff these days, and them bolting on exhausts that are choking the engines down.
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Originally Posted by endeavour32
(Post 4439898)
I had a set a few years ago, and I still kick myself for selling them. Now I'm on the hunt to replace them! In the boat I used them on, I picked up 2 mph over the stainless marine manifold I ran prior.
Originally designed by Dennis Parvey (Coolerman on the boards) and sold thru PF Marine (Parvey and another gentleman) and then sold all of it to Keith Eickert's company. KE Performance. PF Marine link is here: http://pfintercoolers.com/Other_Products.html Now, the exhaust system is all owned and sold by member , thru his company Diamond Performance. He is a sponsor here and here's the link: http://www.diamondperformanceparts.c...a0a0ee6e308124 |
Thought this test was interesting. Healthy 540ci bbc build.
Swapping headers, found a nice 50HP gain in the build, and some torque over the original small headers. http://www.hotrod.com/how-to/engine/...chevy-headers/ |
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A new set of Thunder & Lightings on a 28ft Pantera with a 598ci.
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Diamond - how long are the tails on a normal Bravo application ?
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Originally Posted by DiamondPerformance
(Post 4452876)
A new set of Thunder & Lightings on a 28ft Pantera with a 598ci.
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2 Attachment(s)
I do wonder how the manifolds do in my application over a set of stainless tube headers with large collectors...
1000-1100hp [ATTACH=CONFIG]556734[/ATTACH] |
Originally Posted by corey331
(Post 4452880)
I wish they made them for a LS application. I would have gone with these for sure!!!
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Originally Posted by frickstyle
(Post 4452885)
I do wonder how the manifolds do in my application over a set of stainless tube headers with large collectors...
1000-1100hp [ATTACH=CONFIG]556734[/ATTACH] |
Originally Posted by SB
(Post 4452878)
Diamond - how long are the tails on a normal Bravo application ?
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Originally Posted by DiamondPerformance
(Post 4452947)
The standard tails are 6" long. A small piece of rubber exhaust hose connects to the exhaust tips.
Thank you ! This is great actually, because most correct lengths (when sizing exhaust) call for 12"-20" total length- epending on cid, cam, rpm, and etc. Therefore, the tailpipe can be adjusted to arrive at what the proper length should be for each engine application I'll find my 502 example (again) so everyone can see what I mean. |
Found it:
Originally Posted by SB
(Post 4426415)
The following is from inputs I entered on a 502 with 625 or so HP.
Quoting myself from a earlier post BTW: The program givea much, much more info than I have posted below. But it will give you a good idea on things. Remember, the 'collector' is not just the headers collector. If risers and tails are same ID, which most re, then they too are part of the collector. Do not let yourself end up at a worst length collector. It can/will kill performance. Pipemax Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness 502.176 CID from 3800 to 6300 RPM --- Single Primary Pipe Specs --- Diameter= 1.899 to 2.024 Length= 33.7 to 36.7 inches long --- 2-Step Primary Pipe Specs --- 1st Dia. inches= 1.899 Length= 16.9 to 18.4 2nd Dia. inches= 2.024 Length= 16.9 to 18.4 --- 3-Step Primary Pipe Specs --- 1st Dia. inches= 1.899 Length= 16.9 to 18.4 2nd Dia. inches= 2.024 Length= 8.4 to 9.2 3rd Dia. inches= 2.149 Length= 8.4 to 9.2 --- Header Collector Specs (Conventional Straight Tube) --- Diameter= 3.466 to 3.716 Tuned Lengths= 19.4 best and also 9.7 or 38.8 --- Header Collector Specs (Megaphone or Diffuser Cone Shape) --- Diameter= 2.966 taper to 3.966 Megaphone/Diffuser Length= 19.4 inches Best HP/TQ Tuned Collector Lengths= 19.4 , 38.8 , 77.6 , 155.2 inches long Worst HP/TQ Loss Collector Lengths= 29.1 , 58.2 , 116.4 , 232.8 inches long Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness ---- Primary Pipe's Harmonics ---- 1st Harmonic = 149.4 inches long ... typically never used 2nd Harmonic = 56.5 inches long ... longest recommended 3rd Harmonic = 33.7 inches long ... highly recommended , best Torque Curve 4th Harmonic = 23.4 inches long ... shortest recommended 5th Harmonic = 17.5 inches long ... typically never used 6th Harmonic = 13.8 inches long ... typically never used 7th Harmonic = 11.1 inches long ... typically never used 8th Harmonic = 9.2 inches long ... typically never used ---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ---- 1st Harmonic = 155.2 inches long ... longest with Mufflers and TailPipes Note: Worst = 116.4 inches long for HP/TQ Loss 2nd Harmonic = 77.6 inches long ... longest recommended with Mufflers Note: Worst = 58.2 inches long for HP/TQ Loss 3rd Harmonic = 38.8 inches long ... more bottom-end Torque Note: Worst = 29.1 inches long for HP/TQ Loss 4th Harmonic = 19.4 inches long ... highly recommended , best Torque Curve 5th Harmonic = 9.7 inches long ... reduced Torque , more top-end HP sometimes 6th Harmonic = 4.9 inches long ... reduced Torque , not recommended |
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