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Crankcase evacuation system #489517
10/06/09 12:10 AM 10/06/09 12:10 AM
Joined: Feb 2009
Posts: 154
Escondido, CA
64physhy Offline OP
member
64physhy  Offline OP
member

Joined: Feb 2009
Posts: 154
Escondido, CA
I have a couple questions about crankcase evacuation systems.
1) How much of a difference do the really make over regular breather caps?
2) Does it have to be welded into the collector, or can it be welded into the exhaust just behind the collectors?
3) Is there much of a power increase to be gained?

The car will be used for street and strip (limited street use). I'm currently building a 414 stroker. Haven't got heads yet, but leaning towards Eddy magnums (Hughes prepped with roller rockers and beehive springs), and I already have an RPM Airgap for magnums. The cam I'm leaning towards is Hughes HEH3742AL (237/242@.050 .584/.592 lift). Running a 3500 Turbo Action converter on a race-built 904 reverse shift. Gears will be 4.56 and/or 4.10.
This is going in a '74 Duster (See the yellow one in Diego_Ted's avatar).
Thank you,
Dave
Re: Crankcase evacuation system [Re: 64physhy] #489518
10/06/09 08:04 AM 10/06/09 08:04 AM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
master
Dodgem  Offline
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
I never seen much or any gain on my 542 but it got rid of the pressure that builds up as you PVC quits working at WOT (no vacuum) and so it positively removes excess gasses.
Now keep in mind they will still work with mufflers but not as well. Mine are in the collectors on my muffler get up and in an header extension on my open set up.
The more open the exhaust like a 3" dynomax ultra flow and X pipe the will work fairly good but a closed down 2" system would not work.
Now on a street car you may in fact have to have a functioning PVC and a breather that has the tube to the breather so all gasses are recirculated. that's the way it is hear??
Re: Crankcase evacuation system [Re: Dodgem] #489519
10/06/09 08:24 AM 10/06/09 08:24 AM
Joined: Aug 2003
Posts: 1,416
Lake Charles,Louisiana
B
BILLYJAY Offline
pro stock
BILLYJAY  Offline
pro stock
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Joined: Aug 2003
Posts: 1,416
Lake Charles,Louisiana
Mine are welded in the collector.. I have a 4.75 stroke crank in my motor and before i installed them the crank case pressure was so much that it was pushing oil out of my motor between the oil pan rail.(Lots Of it)now with these installed there is no oil leaks anymore and soon as i can afford it there will be a vacuumn pump on this motor..they are worth the effort....

5528078-008.JPG (184 downloads)
Last edited by BILLYJAY; 10/06/09 08:25 AM.
Re: Crankcase evacuation system [Re: BILLYJAY] #489520
10/06/09 09:23 AM 10/06/09 09:23 AM
Joined: Jan 2007
Posts: 3,695
nc
E
emarine01 Offline
master
emarine01  Offline
master
E

Joined: Jan 2007
Posts: 3,695
nc
I don't think you will see any power gains but the few inches of vac they can produce will have some benefits, you have to install the collector tube correctly to see good results, I found that by making the hole in the collector as close to the recommended position and installing a vac gauge on the nipple and running the engine while moving the nipple around you can find the proper place to weld it in, you will see while fooling with the nipple position that it will make a lot of difference in vac produced

Re: Crankcase evacuation system [Re: 64physhy] #489521
10/06/09 09:40 AM 10/06/09 09:40 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

I have a couple questions about crankcase evacuation systems.
1) How much of a difference do the really make over regular breather caps?
2) Does it have to be welded into the collector, or can it be welded into the exhaust just behind the collectors?
3) Is there much of a power increase to be gained?

The car will be used for street and strip (limited street use). I'm currently building a 414 stroker. Haven't got heads yet, but leaning towards Eddy magnums (Hughes prepped with roller rockers and beehive springs), and I already have an RPM Airgap for magnums. The cam I'm leaning towards is Hughes HEH3742AL (237/242@.050 .584/.592 lift). Running a 3500 Turbo Action converter on a race-built 904 reverse shift. Gears will be 4.56 and/or 4.10.
This is going in a '74 Duster (See the yellow one in Diego_Ted's avatar).
Thank you,
Dave



First... if you have a exhaust system on the car
that has any back pressure it will decrease the
amount of vac.... the header style system will draw
a max of about 5"hg so if your exhaust has any more
back pressure than 5"hg it WILL blow the one way valve
and pressurize the crankcase... you can mount it
just after the collector.... the end of the tube
that mounts in the exhaust should be parallel to the
collector exit
Re: Crankcase evacuation system [Re: MR_P_BODY] #489522
10/06/09 01:40 PM 10/06/09 01:40 PM
Joined: Oct 2004
Posts: 1,752
detroit area
M
moderncylinder Offline
top fuel
moderncylinder  Offline
top fuel
M

Joined: Oct 2004
Posts: 1,752
detroit area
ive had mine pull 9",, there is no limit,, depends on size of pipes, rpm, volume of exh flow

every 3" was worth 6hp for me
Re: Crankcase evacuation system [Re: moderncylinder] #489523
10/06/09 07:14 PM 10/06/09 07:14 PM
Joined: Feb 2009
Posts: 154
Escondido, CA
64physhy Offline OP
member
64physhy  Offline OP
member

Joined: Feb 2009
Posts: 154
Escondido, CA
I shouldn't have much backpressure. I have Dougs Headers with a 2 1/2" X-pipe exhaust with Dynomax Mufflers. I also have cut-outs, so at the track when I'm really on it, it will be open.
Re: Crankcase evacuation system [Re: moderncylinder] #489524
10/06/09 07:44 PM 10/06/09 07:44 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

ive had mine pull 9",, there is no limit,, depends on size of pipes, rpm, volume of exh flow

every 3" was worth 6hp for me




Jeff, what size pipe are you running to get 9"...with
the standard "kit" I've never seen that much even at
8500 rpm in all the testing I did at Chrysler
Re: Crankcase evacuation system [Re: MR_P_BODY] #489525
10/07/09 10:10 AM 10/07/09 10:10 AM
Joined: Oct 2004
Posts: 8,166
Left Coast
B
BobR Offline
master
BobR  Offline
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Joined: Oct 2004
Posts: 8,166
Left Coast
Quote:

Quote:

ive had mine pull 9",, there is no limit,, depends on size of pipes, rpm, volume of exh flow

every 3" was worth 6hp for me




Jeff, what size pipe are you running to get 9"...with
the standard "kit" I've never seen that much even at
8500 rpm in all the testing I did at Chrysler




9"??? I'm from Missouri on that one too.
Re: Crankcase evacuation system [Re: BobR] #489526
10/07/09 11:22 AM 10/07/09 11:22 AM
Joined: Jan 2007
Posts: 3,695
nc
E
emarine01 Offline
master
emarine01  Offline
master
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Joined: Jan 2007
Posts: 3,695
nc
If I had 9" I would quit my day job

Re: Crankcase evacuation system [Re: emarine01] #489527
10/07/09 12:19 PM 10/07/09 12:19 PM
Joined: Oct 2004
Posts: 8,166
Left Coast
B
BobR Offline
master
BobR  Offline
master
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Joined: Oct 2004
Posts: 8,166
Left Coast
Quote:

If I had 9" I would quit my day job



My guess is we aren't talking about the same thing?
Re: Crankcase evacuation system [Re: BobR] #489528
10/07/09 01:29 PM 10/07/09 01:29 PM
Joined: Jan 2007
Posts: 3,695
nc
E
emarine01 Offline
master
emarine01  Offline
master
E

Joined: Jan 2007
Posts: 3,695
nc
The last I checked, I barely had 3" I dont know What are we talkin about here I hope its engine vacuum or Ill be on the day shift forever


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