Re: Crank case evac
[Re: 602heavy]
#609077
02/09/10 07:10 PM
02/09/10 07:10 PM
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Joined: Dec 2007
Posts: 10,542 BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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I've lways put them into the collector. Never had any pipe after that
Even on the tightest sealed motor they won't pull a lot of vacuum. Never measuered it though.
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Re: Crank case evac
[Re: 602heavy]
#609078
02/09/10 07:46 PM
02/09/10 07:46 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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If I can ever get out from under the friggin snow, I wil continue with my evac testing.
Fastest 300
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Re: Crank case evac
[Re: Crizila]
#609081
02/09/10 07:56 PM
02/09/10 07:56 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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This is the tube I am working on right now. Kinda did my own thing on the exit section of the pipe. It's in the header extension ( I run with the extensions on at the track )about 1/2" and I have 1/2 of it capped off. Had the car running on the stands yesterday with the rest of the exhaust system in place and got about 1 - 2"hg at idle. Didn't change when I wound it up. Been snowing like a banchee here, so I can't take it out - nor have I tried it with just the extensions and no exhaust.
Fastest 300
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Re: Crank case evac
[Re: 68LAR]
#609082
02/09/10 08:01 PM
02/09/10 08:01 PM
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Joined: Dec 2007
Posts: 10,542 BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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Quote:
I also use a PCV valve along with my evac system.
Why?
Kinda defeats the purpose doesn't it?
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Re: Crank case evac
[Re: Crizila]
#609084
02/09/10 08:09 PM
02/09/10 08:09 PM
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Joined: Dec 2008
Posts: 1,200 UK
602heavy
OP
pro stock
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OP
pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
This is the tube I am working on right now. Kinda did my own thing on the exit section of the pipe. It's in the header extension ( I run with the extensions on at the track )about 1/2" and I have 1/2 of it capped off. Had the car running on the stands yesterday with the rest of the exhaust system in place and got about 1 - 2"hg at idle. Didn't change when I wound it up. Been snowing like a banchee here, so I can't take it out - nor have I tried it with just the extensions and no exhaust.
Would it of been more effective if the evac tubes entered into the ex pipe as opposed to welding them in flush?
Thanks for the pics.
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Re: Crank case evac
[Re: 602heavy]
#609088
02/09/10 09:43 PM
02/09/10 09:43 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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I did alot of testing on the evac and found that if you weld the tube in with the face of the tube mounted so its parallel with the exit of the collector(or in a collector extension), try to get it away from the side wall some.... doing it this way gives you the greatest negative pressure(vac)... it will pull about 5"hg max but if you run a exhaust system, for every inch Hg of back pressure you have on the exhaust you will decrease the vac by that amount that the engine would see. Try to get it at least 3" from the point where the primary tubes end... also if you use a O2, have the O2 up stream of the evac otherwise it will give the O2 bad numbers
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Re: Crank case evac
[Re: moparniac]
#609092
02/09/10 10:30 PM
02/09/10 10:30 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:
also if you use a O2, have the O2 up stream of the evac otherwise it will give the O2 bad numbers
so the o2 sensor cloer to the collector than the evac nipple?
Up stream... OR in front of the evac(towards the primary tubes)
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Re: Crank case evac
[Re: 602heavy]
#609093
02/09/10 11:42 PM
02/09/10 11:42 PM
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Joined: Dec 2008
Posts: 603 Central Oregon
Rodney
mopar
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mopar
Joined: Dec 2008
Posts: 603
Central Oregon
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Quote:
Quote:
This is the tube I am working on right now. Kinda did my own thing on the exit section of the pipe. It's in the header extension ( I run with the extensions on at the track )about 1/2" and I have 1/2 of it capped off. Had the car running on the stands yesterday with the rest of the exhaust system in place and got about 1 - 2"hg at idle. Didn't change when I wound it up. Been snowing like a banchee here, so I can't take it out - nor have I tried it with just the extensions and no exhaust.
Would it of been more effective if the evac tubes entered into the ex pipe as opposed to welding them in flush?
Thanks for the pics.
we've always had them in about an inch with the taper parallel to the pipe.
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