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Merge Collectors #1059729
08/23/11 12:01 AM
08/23/11 12:01 AM
Joined: May 2011
Posts: 101
NC
1
1967Valiant Offline OP
member
1967Valiant  Offline OP
member
1

Joined: May 2011
Posts: 101
NC
So below are the headers Mr P speced for me. I am having a problem with collector size. 3.5 inch small side easy to get exhaust adapters for, 4 inch big side and cant find any adapters ie neck downs to exhaust mufflers 3.5 inch, any advice on which to go with.



3 step
1st pri dia 1.986 ... length 18.2 to 19.6
2nd pri dia 2.111 ... length 9.1 to 9.8
3rd pri dia 2.236 ... length 9.1 to 9.8
same collector ... stay on the larger end of spec
all dimensions of tubing are OD with a wall thickness
of .062
collector dia 3.616 to 3.866

Re: Merge Collectors [Re: 1967Valiant] #1059730
08/23/11 05:47 AM
08/23/11 05:47 AM
Joined: May 2011
Posts: 101
NC
1
1967Valiant Offline OP
member
1967Valiant  Offline OP
member
1

Joined: May 2011
Posts: 101
NC
bump

Re: Merge Collectors [Re: 1967Valiant] #1059731
08/23/11 10:04 AM
08/23/11 10:04 AM
Joined: Jul 2005
Posts: 1,162
s e mich
ro23car Offline
super stock
ro23car  Offline
super stock

Joined: Jul 2005
Posts: 1,162
s e mich
go to some semi truck site they have them. 4 states in joplin mo,chrome depot in mantua ohio.

Re: Merge Collectors [Re: 1967Valiant] #1059732
08/23/11 11:17 AM
08/23/11 11:17 AM
Joined: Oct 2004
Posts: 8,165
Left Coast
B
BobR Offline
master
BobR  Offline
master
B

Joined: Oct 2004
Posts: 8,165
Left Coast
Burns Stainless.

Re: Merge Collectors [Re: BobR] #1059733
08/23/11 12:18 PM
08/23/11 12:18 PM
Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing Offline
master
Dunnuck Racing  Offline
master

Joined: Mar 2007
Posts: 3,300
Northern Indiana
More often than not,if a merge collector gives you a power gain over a large straight collector,you are using too large of a size to begin with.
Keith

Re: Merge Collectors [Re: 1967Valiant] #1059734
08/23/11 01:33 PM
08/23/11 01:33 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

So below are the headers Mr P speced for me. I am having a problem with collector size. 3.5 inch small side easy to get exhaust adapters for, 4 inch big side and cant find any adapters ie neck downs to exhaust mufflers 3.5 inch, any advice on which to go with.



3 step
1st pri dia 1.986 ... length 18.2 to 19.6
2nd pri dia 2.111 ... length 9.1 to 9.8
3rd pri dia 2.236 ... length 9.1 to 9.8
same collector ... stay on the larger end of spec
all dimensions of tubing are OD with a wall thickness
of .062
collector dia 3.616 to 3.866




The collector I speced out was a standard straight...
as for a merge collector they are VERY specific to
each engine(sorta like a 2 stroke expansion camber)...
the cone rate dia and length then the small dia and
then the exit cone rate

Re: Merge Collectors [Re: MR_P_BODY] #1059735
08/23/11 05:14 PM
08/23/11 05:14 PM
Joined: Oct 2003
Posts: 1,170
Westbury, NY
B
bumps440 Offline
super gas
bumps440  Offline
super gas
B

Joined: Oct 2003
Posts: 1,170
Westbury, NY
Engine size? Rpm range?

P body..... do you use pipemax program???

Pipes seem a bit long to me.... Unless large motor and low rpms.


Well.... low by my standards.

Re: Merge Collectors [Re: bumps440] #1059736
08/23/11 05:20 PM
08/23/11 05:20 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

Engine size? Rpm range?

P body..... do you use pipemax program???

Pipes seem a bit long to me.... Unless large motor and low rpms.


Well.... low by my standards.




Yes I use the Pipemax program.... have been for YEARS...
even when I built headers for Chrysler and had access
to the dyno to do testing

Re: Merge Collectors [Re: MR_P_BODY] #1059737
08/23/11 05:32 PM
08/23/11 05:32 PM
Joined: Oct 2003
Posts: 1,170
Westbury, NY
B
bumps440 Offline
super gas
bumps440  Offline
super gas
B

Joined: Oct 2003
Posts: 1,170
Westbury, NY
Recognized it right away. lol
I use it too. Have been for along time also. I dont build headers though. just use it to tune my projects.
Larry is a smart guy. and the program works if you use it right.







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