merge collectors
#1676607
09/24/14 08:30 PM
09/24/14 08:30 PM
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Joined: Oct 2011
Posts: 3,036
bean town ....Ca
WHITEDART
OP
master
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OP
master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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how much horsepower or improvement in ET have you guys seen switching from the conventional collector to a merge collector
Last edited by WHITEDART; 09/24/14 08:45 PM.
In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
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Re: merge collectors
[Re: WHITEDART]
#1676608
09/24/14 08:51 PM
09/24/14 08:51 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:
how much horsepower or improvement in ET have you guys seen witching from the conventional collector to a merge collector
This might be a hard question to answer.. a TRUE merge
collector HAS to be designed for a certain engine..
but from the little bit I know about merge collectors
that COULD be as high as 25-30 hp.. again.. if designed
for that engine.. the diameter on the inlet, taper
rate and max diameter then the taper rate down to
exit diameter... its much like a 2 cycle expansion
camber... do it wrong and you move the power range
way down or way out of the rpm range... I played with
them on the dyno and finally gave up with what I was
playing with... so to just buy a merge collector off
the shelf is wasting your time and money... JMO
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Re: merge collectors
[Re: WHITEDART]
#1676612
09/24/14 11:30 PM
09/24/14 11:30 PM
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Joined: May 2003
Posts: 13,185
aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,185
aZLiViN
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Quote:
how much horsepower or improvement in ET have you guys seen switching from the conventional collector to a merge collector
Greg built my headers with a merge set up. for the cost of a regular collector you can bet we'll be playing with it...... someday. I seem to find alot of other things to do other than work on the car.
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Re: merge collectors
[Re: BradH]
#1676614
09/25/14 04:08 PM
09/25/14 04:08 PM
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Joined: Jan 2003
Posts: 2,915
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,915
A shed in England
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We swapped out some home built, crappy mild steel 2 1/4 with 4 inch collector for some custom, $2500, Stainless, 2 1/4 equal(ish) length with 4 inch merge collectors. Et's and MPH never changed a bit  but they sure looked a lot better 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: merge collectors
[Re: Tig]
#1676616
09/25/14 05:18 PM
09/25/14 05:18 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:
We swapped out some home built, crappy mild steel 2 1/4 with 4 inch collector for some custom, $2500, Stainless, 2 1/4 equal(ish) length with 4 inch merge collectors. Et's and MPH never changed a bit but they sure looked a lot better
Thats the time about headers and the merge collectors..
it has to be matched to the engine and the rpm that
it will be at MOST of the time... I did header work at
Chrysler for about 15 years and near the end I was
playing with merge collectors... but the merge coll
wants to be in a certain rpm range most of the time..
thats why the pro stocks use them.. they dont vary
a ton in rpm like a lot of other engines... I put
about 40 hours into merge collectors on the dyno to
come up with a formula but I never really got there
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