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| 180 degree exhaust for 3800 2 (Page 2/4) |
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Blacktree
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OCT 16, 02:06 PM
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| quote | | Originally posted by pmbrunelle: 180 degrees is in reference to camshaft degrees... |
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This is incorrect. The purpose of 180-degree headers is to have exhaust pulses in each header spaced evenly, i.e. 180 degrees of crankshaft rotation apart. (on an odd-fire V8)
| quote | Originally posted by pmbrunelle:
You would pair together the following cylinders which are separated by 360 crankshaft degrees:
1, 4
6, 3
5, 2 |
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... which makes them 360-degree headers, not 180-degree headers. I even mentioned this in the thread linked above.[This message has been edited by Blacktree (edited 10-16-2019).]
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La fiera
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OCT 16, 03:11 PM
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Johns 4.9
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OCT 16, 05:01 PM
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Yeah, I'm going to go with with Blacktree on this.
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ttt123
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OCT 17, 06:46 AM
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so to sum up ... just make equal length headers and call it a day lol Either way I go I will be sure to post the video so everyone can hear how they sound.
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Blacktree
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OCT 17, 09:26 AM
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Equal length headers on the 3800 V6 should be optimal for scavenging. And exhaust scavenging is important for performance. So if your primary concern is performance, that would be most desirable.
That said, there's nothing stopping you from trying other exhaust configurations, to modify the sound. You might be leaving a few HP on the table. But if you're OK with that, then no big deal.
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ttt123
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OCT 17, 09:53 AM
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| quote | Originally posted by Blacktree:
Equal length headers on the 3800 V6 should be optimal for scavenging. And exhaust scavenging is important for performance. So if your primary concern is performance, that would be most desirable.
That said, there's nothing stopping you from trying other exhaust configurations, to modify the sound. You might be leaving a few HP on the table. But if you're OK with that, then no big deal. |
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ya I think the hp of the motor would still be nice even if I left a little on the table. about the only I didn't do to this motor is the aluminum heads and turbo. the 3 sets of 2 into 1 exhaust really sounds interesting and I bet it would make some very unique sound. I've been thinking about that set up since yesterday but the routing might be a bigger headache that I want so right now i'm tossing around that vs the equal length to x to out.
I wish there was more video's and examples of people experimenting with this motor for sound. most of the stuff on youtube is all the same with very little difference.
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La fiera
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OCT 17, 11:57 AM
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One problem that you might encounter building an intricate exhaust with lots of piping is heat radiation.
The longer the pipe the more heat you'll radiate under your decklid.
That's why I took mine from under the car and re routed it over the transmission and made it shorter too.
Of course, the length of my exhaust was primarily designed to match the power band of my engine.
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ttt123
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OCT 17, 12:13 PM
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| quote | Originally posted by La fiera:
One problem that you might encounter building an intricate exhaust with lots of piping is heat radiation.
The longer the pipe the more heat you'll radiate under your decklid.
That's why I took mine from under the car and re routed it over the transmission and made it shorter too.
Of course, the length of my exhaust was primarily designed to match the power band of my engine. |
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good point. but for my set up I don't think I would have as much of an issue as most of the 3.8 swaps with that. the motor is mounted longitudinally and the exhaust goes rearward with the transmission is forward. from the pullies on my motor to the bumper on my car is probably 12 inches.. if that. so my exhaust will be very short regardless of the route I choose as long as I go out the back.
i'm going to start in the next couple days so a decision will be made and i'll cross my fingers lol
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ttt123
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OCT 26, 05:14 PM
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Well i made them. Would anyone care to post the picks for me? They are all equal length within 3/16 and each runner is 6 1/4 long. The collector is 2 1/2 .
Im working on the Xpipe and shorty mufflers now. Should have them done in a few days.
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Johns 4.9
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OCT 26, 05:31 PM
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ttt123,
I think you are doing a great job on your exhaust system and I appreciate your "go for it" attitude. Can't wait to see them!
Cheers,
John
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