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Re: Evac/ collector size question?
[Re: flatiron]
#717044
06/05/10 07:47 PM
06/05/10 07:47 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:
I would like to put a Evac system on my 360 strictly strip footbrake bracket car. Can I put just collectors on my open headers then weld the nipples on? I measured the inside of the big tube where all my tubes come together and it measures 2.75 so do I need a 3" collector?
I'd go with the 3" if you can get it on... how long
is the collector on the header... I think you would
like a total collector length of about 16"- 18"
what are the primary tube diameters
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Re: Evac/ collector size question?
[Re: MR_P_BODY]
#717045
06/05/10 08:07 PM
06/05/10 08:07 PM
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Joined: Mar 2008
Posts: 724
PA USA
flatiron
OP
super stock
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OP
super stock
Joined: Mar 2008
Posts: 724
PA USA
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Re: Evac/ collector size question?
[Re: flatiron]
#717046
06/05/10 08:17 PM
06/05/10 08:17 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:
Primary OD 1.625, Collector OD 3.0, Collector length on the header is 8.0 On the right side I might be able to go straight back for a total of 12" before I run into issue's with the tranny crossmember.  
Go with the 3" and try to make them as long as you
can without running into problems with the cross member
try to keep it far enough away so you dont restrict
exit flow
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Re: Evac/ collector size question?
[Re: MR_P_BODY]
#717047
06/05/10 08:28 PM
06/05/10 08:28 PM
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Joined: Mar 2008
Posts: 724
PA USA
flatiron
OP
super stock
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OP
super stock
Joined: Mar 2008
Posts: 724
PA USA
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Quote:
Quote:
Primary OD 1.625, Collector OD 3.0, Collector length on the header is 8.0 On the right side I might be able to go straight back for a total of 12" before I run into issue's with the tranny crossmember.
Go with the 3" and try to make them as long as you
can without running into problems with the cross member
try to keep it far enough away so you dont restrict
exit flow
How far do you think I should stay back from the cross member?
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Re: Evac/ collector size question?
[Re: rebel]
#717050
06/05/10 10:34 PM
06/05/10 10:34 PM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
master
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master
Joined: Feb 2007
Posts: 6,295
U.S.
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why do you have that in 1 tube and not in the collector?
Mopar Performance
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Re: Evac/ collector size question?
[Re: Bob_Coomer]
#717052
06/05/10 11:30 PM
06/05/10 11:30 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:
Quote:
why do you have that in 1 tube and not in the collector?
Good question..
You would think this setup would isolate the other cylinders ablity to help scavange exh gasses?
Plus your looking for the biggest volume of air to
get the biggest vac... which in this style of system
isnt much anyways... only about 5"hg... that #8 line
isnt very big right at the fitting
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Re: Evac/ collector size question?
[Re: moparniac]
#717053
06/06/10 12:45 AM
06/06/10 12:45 AM
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Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
master
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master
Joined: Dec 2006
Posts: 4,647
aotearoa
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Quote:
why do you have that in 1 tube and not in the collector?
it came down to the easist point to fit. the collector is hard up against the chassis rail so if i was to place in the collector i would have to run the -8 line to the other side which would mean the line would snagg with the tire on hard lock. as it is, we have reduced turning radius so didn't want to make it worse. we looked at some different options but decided on simplicity in the end since the collector is extremely short & cut back on an angle as not to catch on the trailer during unloading. it seems to work fine like this & so it will stay like this till we step up to a vac pump & dry sump. at the end of the day we're only bracket racing & not going for world records so it simply doesn't matter.
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