Re: Merge Collectors
[Re: barryc]
#708362
05/26/10 02:11 PM
05/26/10 02:11 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Anybody have any good results with merge collectors? Are they worth it?
I've tested many different styles of collectors and
if you have a set of purpose built headers for YOUR
engine then they do help a fair bit... other than that
the cost per HP gain isnt worth it (to me).... most
people dont use a long enough collector in the first
place.... off the shelf headers are WAY TOO SHORT
when it comes to the collector
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Re: Merge Collectors
[Re: barryc]
#708364
05/26/10 02:54 PM
05/26/10 02:54 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Does the old way for collectors still work? Mark them with cheap paint or crayon and cut them where it stops burning off?
NO... you would have to have a perfect tune for that
to even be close... I know many guys say that it works
but in reality its not close... for instance, if you
are running fat do you think it would burn in the same
place as if you were running lean... no way... headers
are a mathematical and sound wave function
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Re: Merge Collectors
[Re: barryc]
#708368
05/26/10 03:41 PM
05/26/10 03:41 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Short of trail and error, whats the best way to determine the correct length for a collector.
Send me a PM and I'll run your engine through my header
program... I'll need some info
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Re: Merge Collectors
[Re: MR_P_BODY]
#708369
05/26/10 04:56 PM
05/26/10 04:56 PM
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Joined: Jul 2003
Posts: 872
Charlotte NC
DCI
super stock
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super stock
Joined: Jul 2003
Posts: 872
Charlotte NC
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Give me the bore, stroke, exhaust valve opening BTDC and peak power RPM I will run it in mine and give you the results as well.
"Turbo will be easiest, and at the HP level will also be easiest on parts. Spend the money to do it right, and you can build a 500 HP street motor that will live a long and happy life, and probably with a very basic short block."
Those words must have left a bad taste in his mouth!
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Re: Merge Collectors
[Re: barryc]
#708371
05/26/10 07:42 PM
05/26/10 07:42 PM
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Joined: Jul 2003
Posts: 872
Charlotte NC
DCI
super stock
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super stock
Joined: Jul 2003
Posts: 872
Charlotte NC
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4 into 1 header design:
Primary tube - 19.88"
Primary Tube diameter - 2.58"
Collector - 9.94"
Collector diameter - 4.91"
Using the numbers you listed.
EDIT - made a calculation error. Had two kids begging for a golf cart ride and entered a value wrong. LOL
Last edited by DCI; 05/26/10 09:21 PM.
"Turbo will be easiest, and at the HP level will also be easiest on parts. Spend the money to do it right, and you can build a 500 HP street motor that will live a long and happy life, and probably with a very basic short block."
Those words must have left a bad taste in his mouth!
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Re: Merge Collectors
[Re: barryc]
#708373
05/26/10 09:20 PM
05/26/10 09:20 PM
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Joined: Apr 2003
Posts: 3,514
Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,514
Tulsa, Oklahoma
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Quote:
Thanks for the info, but the car picked up when I went to a custom made 2" header. Primaries are 38 and collectors are 3 1/2.
The tube size quoted may be ID not OD, if so you may be closer than you think.
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Re: Merge Collectors
[Re: MR_P_BODY]
#708375
05/26/10 09:56 PM
05/26/10 09:56 PM
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Joined: Jul 2003
Posts: 872
Charlotte NC
DCI
super stock
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super stock
Joined: Jul 2003
Posts: 872
Charlotte NC
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Using another calculator i have that only uses rpm, ci and BBDC value -
Your Primary Tube Length is 33.26
Your Primary Tube Diameter is 1.95 inches
Your Collector Length is 16.63 inches
Your Collector Diameter is 3.71 inches .
"Turbo will be easiest, and at the HP level will also be easiest on parts. Spend the money to do it right, and you can build a 500 HP street motor that will live a long and happy life, and probably with a very basic short block."
Those words must have left a bad taste in his mouth!
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Re: Merge Collectors
[Re: DCI]
#708376
05/26/10 10:04 PM
05/26/10 10:04 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Using another calculator i have that only uses rpm, ci and BBDC value -
Your Primary Tube Length is 33.26
Your Primary Tube Diameter is 1.95 inches
Your Collector Length is 16.63 inches
Your Collector Diameter is 3.71 inches .
That is much more in line
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Re: Merge Collectors
[Re: MR_P_BODY]
#708377
05/26/10 10:54 PM
05/26/10 10:54 PM
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Joined: Apr 2005
Posts: 1,106
Quebec, Canada
Diablo
super stock
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super stock
Joined: Apr 2005
Posts: 1,106
Quebec, Canada
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Quote:
Quote:
Quote:
Thanks for the info, but the car picked up when I went to a custom made 2" header. Primaries are 38 and collectors are 3 1/2.
The tube size quoted may be ID not OD, if so you may be closer than you think.
Tubing is always OD
EDIT
A primary dia of 2.58 and a collector of 5"... most
big blocks dont even go that big and this is a 422"
small block that makes peak power at 6800
I gave my info to Mr P Body a while back for my 636ci and didn't get that big of numbers.;) He gave me around 2.5 primary and 4.5 collector. 410ci i'm guessing closer to 2 inch
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