Slant Six Forum :: Headers and Exhaust

When I took the big header off mine and put the Clifford long tubes on I lost about 2 tenths and 3 mph in the quarter, but the car became a lot more consistent.

Same day comparison, car picked up 2 tenths having Patrick drive it because he is more of a normal sized human.

It was a large tube 6 into 1 Mike had built just for nitrous.

Quote:

Asking for clarification: "The big Header" was that a 6 into 1 header, or just big primary tube headers?

When Mike was running his Stocker he tested the small tube Mopar 6X1 header against the slightly larger long tube Hooker 6X2 set he used in the car. He said they ran them on Bogner's engine dyno and the results were not even close. The Hookers were a lot better.

I guess what I am saying is your exhaust choice needs to match your combination. The more pkwer you make the better header you need.

Mike didn't think the big 6X1 would work at all in my combo, and if the motor didn't go to 4000 on the brake it wouldn't get out of it's own way. It ran big speed out at the other end.

The smaller headers would let the motor get on the brake consistently, but gave up power up top.

All things being equal, I think the 3X1 helps low end while 6X1 makes more up top.

But realistically if the tube size and length are equal, it won't make a whole lot of difference.

6X1 does tend to hang lower in the chassis.

Author:	slantzilla [ Thu Apr 06, 2023 9:13 am ]
Post subject:	Re: Headers and Exhaust
When I took the big header off mine and put the Clifford long tubes on I lost about 2 tenths and 3 mph in the quarter, but the car became a lot more consistent. Same day comparison, car picked up 2 tenths having Patrick drive it because he is more of a normal sized human.

Author:	Jase [ Fri Apr 07, 2023 10:23 am ]
Post subject:	Re: Headers and Exhaust
Quote: When I took the big header off mine and put the Clifford long tubes on I lost about 2 tenths and 3 mph in the quarter, but the car became a lot more consistent. Same day comparison, car picked up 2 tenths having Patrick drive it because he is more of a normal sized human. Asking for clarification: "The big Header" was that a 6 into 1 header, or just big primary tube headers?

Author:	slantzilla [ Fri Apr 07, 2023 2:29 pm ]
Post subject:	Re: Headers and Exhaust
It was a large tube 6 into 1 Mike had built just for nitrous.

Author:	JimKueneman [ Fri Apr 07, 2023 5:27 pm ]
Post subject:	Re: Headers and Exhaust
Quote: It was a large tube 6 into 1 Mike had built just for nitrous. Did you have a crossover between the Clifford header 3:1 pipes? How far from the head? Jim

Author:	slantzilla [ Fri Apr 07, 2023 8:11 pm ]
Post subject:	Re: Headers and Exhaust
No crossover.

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Headers and Exhaust https://mail.slantsix.org/forum/viewtopic.php?t=67174	Page 2 of 4

Author:	Jase [ Sun Apr 09, 2023 8:30 am ]
Post subject:	Re: Headers and Exhaust
Quote: Quote: When I took the big header off mine and put the Clifford long tubes on I lost about 2 tenths and 3 mph in the quarter, but the car became a lot more consistent. Same day comparison, car picked up 2 tenths having Patrick drive it because he is more of a normal sized human. Asking for clarification: "The big Header" was that a 6 into 1 header, or just big primary tube headers? Does this imply that a 6 into one header would be ideal for all slant 6 engines if the primary tubes were the appropriate size and length for the intended RPM range.. despite the difficulty in getting them to fit an actual engine bay? Does the dual 3 into 1 header ever have the edge for different applications?

Author:	slantzilla [ Sun Apr 09, 2023 10:24 am ]
Post subject:	Re: Headers and Exhaust
When Mike was running his Stocker he tested the small tube Mopar 6X1 header against the slightly larger long tube Hooker 6X2 set he used in the car. He said they ran them on Bogner's engine dyno and the results were not even close. The Hookers were a lot better. I guess what I am saying is your exhaust choice needs to match your combination. The more pkwer you make the better header you need. Mike didn't think the big 6X1 would work at all in my combo, and if the motor didn't go to 4000 on the brake it wouldn't get out of it's own way. It ran big speed out at the other end. The smaller headers would let the motor get on the brake consistently, but gave up power up top.

Author:	Jase [ Sun Apr 09, 2023 1:11 pm ]
Post subject:	Re: Headers and Exhaust
Quote: When Mike was running his Stocker he tested the small tube Mopar 6X1 header against the slightly larger long tube Hooker 6X2 set he used in the car. He said they ran them on Bogner's engine dyno and the results were not even close. The Hookers were a lot better. I guess what I am saying is your exhaust choice needs to match your combination. The more pkwer you make the better header you need. Mike didn't think the big 6X1 would work at all in my combo, and if the motor didn't go to 4000 on the brake it wouldn't get out of it's own way. It ran big speed out at the other end. The smaller headers would let the motor get on the brake consistently, but gave up power up top. Interesting! Tube size being equal, would you choose a 6X1, or 3X2

Author:	slantzilla [ Sun Apr 09, 2023 1:29 pm ]
Post subject:	Re: Headers and Exhaust
All things being equal, I think the 3X1 helps low end while 6X1 makes more up top. But realistically if the tube size and length are equal, it won't make a whole lot of difference. 6X1 does tend to hang lower in the chassis.

Author:	CNC-Dude [ Sun Apr 09, 2023 1:51 pm ]
Post subject:	Re: Headers and Exhaust
A lot of R&D has been done with 6 cylinder racers and 6 into 1 headers all the way up to Comp Eliminator, and they simply don't make as much HP and torque as a 3 into 1 times 2 design. It has a lot to do with the 1-2-3 and 4-5-6 cylinders needing to be separated from each other to have effective scavenging of the cylinders. A 6 into 1 cannot do that as well because of the odd 120 degree cylinder firing compared to 90 degree firing in a V8, where 180 degree headers can work very well.

Author:	Jase [ Mon Apr 10, 2023 7:39 am ]
Post subject:	Re: Headers and Exhaust
Quote: All things being equal, I think the 3X1 helps low end while 6X1 makes more up top. But realistically if the tube size and length are equal, it won't make a whole lot of difference. 6X1 does tend to hang lower in the chassis. Ok, well 3X2 is easier to package anyway.

Author:	hyper_pak [ Tue Apr 11, 2023 7:39 am ]
Post subject:	Re: Headers and Exhaust
My ignorance here, how is the 120 degree so different than a v8?

Author:	CNC-Dude [ Tue Apr 11, 2023 8:35 am ]
Post subject:	Re: Headers and Exhaust
A V8 is 90 degrees....also, with a V8, a custom cam profile is needed to use 180 degree headers and a firing order change is helpful to gain full benefit of that type of modification...

Author:	hyper_pak [ Tue Apr 11, 2023 2:52 pm ]
Post subject:	Re: Headers and Exhaust
Yes, v8 is 90, but what is the practical difference in what the header sees? I know the amount of pulses in the collector would be more per revolution.

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Author:	CNC-Dude [ Tue Apr 11, 2023 3:37 pm ]
Post subject:	Re: Headers and Exhaust
I can't really say, I just know a lot of inline racers have tried in futility to make the concept work and it just doesn't. But it has to do with the V8's being able to change the firing order and the 6 cylinder style engines you can't as being part of it...