Exhaust Question
07-05-2015, 10:35 AM
#52
Registered
Thread Starter
07-05-2015, 11:50 AM
#53
Registered
07-07-2015, 05:04 PM
#54
Offshoreonly Advertiser
Is this it?
__________________
www.diamondperformanceparts.com
[email protected]
http://www.facebook.com/pages/Diamon...07878772615803
302-521-0123
The Best Parts & Service At The Best Price
www.diamondperformanceparts.com
[email protected]
http://www.facebook.com/pages/Diamon...07878772615803
302-521-0123
The Best Parts & Service At The Best Price
07-07-2015, 05:16 PM
#55
Registered
iTrader: (1)
Yeh, that's it.
Diamond Performance's (KE) Exhaust absolutely kicks azz in most, if not all, Naturally Aspirated Marine Big Block out there.
As camshafts grow (get bigger) than that Hp500 tested, the DM exhaust's advantage will be even greater.
Diamond Performance's (KE) Exhaust absolutely kicks azz in most, if not all, Naturally Aspirated Marine Big Block out there.
As camshafts grow (get bigger) than that Hp500 tested, the DM exhaust's advantage will be even greater.
07-07-2015, 05:21 PM
#56
Registered
iTrader: (1)
Here you go , a quote of myself
Most people think KE's are ugly and don't care if they make more hp. It's true !
The over achieving 502's I've seen have a few things in common:
Afr Heads
KE Exhaust
Here's Pipemax printout for a typical high performance 502 marine build and if you look real carefully you'll see why the KE's kick some serious arse with these:
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.
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
The over achieving 502's I've seen have a few things in common:
Afr Heads
KE Exhaust
Here's Pipemax printout for a typical high performance 502 marine build and if you look real carefully you'll see why the KE's kick some serious arse with these:
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.
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
Last edited by SB; 07-07-2015 at 05:34 PM.
01-06-2018, 08:47 AM
#57
Registered
iTrader: (4)
I'm going to bring this back to the top.
Bill- are you sure about the Thunder & Lighting exhaust having a 1 7/8" internal runner? There are several posts buried deep in the OSO vault where Cooleman posted they are 2" runner?
I've ran K/E headers on 3 engines now, they are by far the best exhaust I've ever run. I just sold my last set because I really don't think they are big enough for a 1000 hp engine. So 2 questions for you: 1. are you positive the runner is only 1 7/8"? When I measured mine I thought the runners measured 1" x 2 1/16" +/-. 2. The collector ID is only 3.35", can this be safely bored out at all? If you are not sure, would you check with who ever is casting these for you.
Right now with my new engines I'm most likely going to run SM Gen III's, but I've always had good luck with the K/E's and would buy some new sets if I knew for certain the ID of the runners, and if the collector could be opened up a bit to increase flow.
Bill- are you sure about the Thunder & Lighting exhaust having a 1 7/8" internal runner? There are several posts buried deep in the OSO vault where Cooleman posted they are 2" runner?
I've ran K/E headers on 3 engines now, they are by far the best exhaust I've ever run. I just sold my last set because I really don't think they are big enough for a 1000 hp engine. So 2 questions for you: 1. are you positive the runner is only 1 7/8"? When I measured mine I thought the runners measured 1" x 2 1/16" +/-. 2. The collector ID is only 3.35", can this be safely bored out at all? If you are not sure, would you check with who ever is casting these for you.
Right now with my new engines I'm most likely going to run SM Gen III's, but I've always had good luck with the K/E's and would buy some new sets if I knew for certain the ID of the runners, and if the collector could be opened up a bit to increase flow.
Last edited by endeavour32; 01-07-2018 at 09:02 AM.
01-06-2018, 09:10 AM
#58
Registered
iTrader: (4)
Also- Does anyone know what the width of the SM Gen III's is on a tall deck with raised port heads? Right now my center to center on my engines is 36.5" Seeing that I'm replacing all the stringers in my engine bay, if I can, I would like to change that to 35.5" or less if possible.
Anyone have any opinions on the the IMCO Power Flow Plus? I know they have 2 1/4" internal runners, but no-one really ever discusses them.
Anyone have any opinions on the the IMCO Power Flow Plus? I know they have 2 1/4" internal runners, but no-one really ever discusses them.
Last edited by endeavour32; 01-06-2018 at 09:18 AM.
01-08-2018, 07:46 PM
#59
Registered
iTrader: (4)
I called Jerry at Stainless Marine today and talked to him about the Gen III manifolds. He said that the manifolds on a tall deck, side by side application, there should be no clearance issue with the engines 35" center to center. I then learned that there are three different versions of the Gen III. Standard, narrow and narrow tilted. Essentially they can do whatever is needed to make them work (within reason). Next I asked about the internal runner diameter, the answer was huge! He said they have more volume than a 2 1/2" tube, so yes I agree with huge. Then he told me that they make more power than any marine header, INCLUDING big tube headers. He said that with blower motors flow is all that matters, and that runner length is rather unimportant. He continued to say that they have years and years of back to back dyno tests, from very reputable builders proving that statement.
So anyone thinking about the Gen III's, I hope this answered some questions. I also know where you can get them for a good price, PM me if anyone is interested, that would also include standard SM manifolds.
So anyone thinking about the Gen III's, I hope this answered some questions. I also know where you can get them for a good price, PM me if anyone is interested, that would also include standard SM manifolds.
