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Header Evacuation system question? #1507378 09/25/13 10:38 AM 09/25/13 10:38 AM
Joined: Dec 2004 Posts: 2,703 Mohnton, Pa DodgeCharger OP master
DodgeCharger OP master Joined: Dec 2004 Posts: 2,703 Mohnton, Pa	I am going to add a header evac system to my motor since it is building a lot of pressure when I run the car at the track. My question is when I run exhaust on the street can I just remove the hoses? Will the check valves keep any exhaust from leaking or do I need to pull the check valves and cap the tubes? Also has anyone noticed a significant gain in horsepower or ET by adding this system to there motor? Thanks,

Re: Header Evacuation system question? [Re: DodgeCharger] #1507379 09/25/13 10:43 AM 09/25/13 10:43 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	If your exhaust has greater than 5"hg back pressure then you need to pull the check valves otherwise your just gonna burn them out and you have a exhaust leak

Re: Header Evacuation system question? [Re: MR_P_BODY] #1507380 09/25/13 10:47 AM 09/25/13 10:47 AM
Joined: Dec 2004 Posts: 2,703 Mohnton, Pa DodgeCharger OP master
DodgeCharger OP master Joined: Dec 2004 Posts: 2,703 Mohnton, Pa	Do you know what I can use to plug them? My exhaust is very restrictive.

Re: Header Evacuation system question? [Re: DodgeCharger] #1507381 09/25/13 10:58 AM 09/25/13 10:58 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Do you know what I can use to plug them? My exhaust is very restrictive. Depending if its a male or female thread.. but its just pipe thread.. so a pipe cap or pipe plug(most have a male thread so you use a cap)

Re: Header Evacuation system question? [Re: DodgeCharger] #1507382 09/25/13 11:19 AM 09/25/13 11:19 AM
Joined: May 2011 Posts: 4,489 northern,Ohio,USA C Clanton master
Clanton master C Joined: May 2011 Posts: 4,489 northern,Ohio,USA	Be carefull where you place the pipe in the exh as any back pressure will blow back into the engine.I had mine at an elbow and at idle it back flowed to the engine. GOTBOOST!New improved with Victor heads. http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/

Re: Header Evacuation system question? [Re: Clanton] #1507383 09/25/13 12:19 PM 09/25/13 12:19 PM
Joined: Feb 2003 Posts: 1,942 Metro Detroit OUTLAWD top fuel
OUTLAWD top fuel Joined: Feb 2003 Posts: 1,942 Metro Detroit	Quote: Be carefull where you place the pipe in the exh as any back pressure will blow back into the engine.I had mine at an elbow and at idle it back flowed to the engine. Glad to hear I'm not the only one! After I found mine pressurizing the crankcase, I just capped them with a pipe cap. Faster, Faster until the thrill of speed overcomes the fear of death... 71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater

Re: Header Evacuation system question? [Re: OUTLAWD] #1507384 09/25/13 01:15 PM 09/25/13 01:15 PM
Joined: Jan 2003 Posts: 3,874 Smyrna, South Carolina STEFF master
STEFF master Joined: Jan 2003 Posts: 3,874 Smyrna, South Carolina	Put the evac connection just behind the muffler, not in the collector before the muffler.

Re: Header Evacuation system question? [Re: STEFF] #1507385 09/25/13 01:22 PM 09/25/13 01:22 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Mine are in the collectorabout an inch from the flange. I drive mine on the street w/ no issues. I have 2" super comps and a summit 3" system. Might help that my mufflers are straight thru design. As for how much et??? not sure I haven't run it w/o. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Header Evacuation system question? [Re: OUTLAWD] #1507386 09/25/13 03:59 PM 09/25/13 03:59 PM
Joined: Oct 2004 Posts: 8,165 Left Coast B BobR master
BobR master B Joined: Oct 2004 Posts: 8,165 Left Coast	Quote: Quote: Be carefull where you place the pipe in the exh as any back pressure will blow back into the engine.I had mine at an elbow and at idle it back flowed to the engine. Glad to hear I'm not the only one! After I found mine pressurizing the crankcase, I just capped them with a pipe cap. I've had no luck running them any kind of exhaust and I tried at one point. Even with open exhaust they are marginal at best. There will be no power gain. The power gain comes from using a vacuum pump and real light oil control rings. You cannot do this with exhaust evacs. I know I will get a dissenting opinion but that's my experience.

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