Crankcase Evacuation System....
hook a hose to that valley cover and try to blow in it
you may find that is quite restrictive, and i doubt you will see flow sufficient to do a good job of crank evac.
pulling from each valve cover would be unrestricted flow to each header, unfortunately much more oil will also come with it (unless you use a catch can)
i think the whole dipstick modding is a waste of time and effort to do or even discuss. it has an o-ring on it, will be just fine not that it would contribute to any measurable leak in the first place.
if you are to use any muffler at all i would not bother with the header evac kits, as they barely work in the first place.
*edit* i forgot to add another note while on my header evac soap box. your rear tires (and all the guys racing after you) will not appreciate oil being sucked out of the engine and being blown down onto them. please consider
you may find that is quite restrictive, and i doubt you will see flow sufficient to do a good job of crank evac.
pulling from each valve cover would be unrestricted flow to each header, unfortunately much more oil will also come with it (unless you use a catch can)
i think the whole dipstick modding is a waste of time and effort to do or even discuss. it has an o-ring on it, will be just fine not that it would contribute to any measurable leak in the first place.
if you are to use any muffler at all i would not bother with the header evac kits, as they barely work in the first place.
*edit* i forgot to add another note while on my header evac soap box. your rear tires (and all the guys racing after you) will not appreciate oil being sucked out of the engine and being blown down onto them. please consider
Right on agreed, one real problem I see is if i want to put a bigger outlet out of the valley cover w using a plastic intake they sit so close and dont leave alot of room to weld in anything much bigger Im running a factory gm LS7 intake and I cant see how in the world Id fit a -12 fitting in with out it getting in the way of not letting the intake sit flat to seal and than ya got 1/4 of block material to watch out for when u bolt the valley plate back on
They'll add whatever size bulkhead you want.
it fits perfect, its already been tested on several cars...otherwise Bob wouldnt sell it.. and I know Bob personally... Just bought him lunch the other day.
I use the LS1 version, plus some custom baffles and I use a Moroso Vacuum pump setup as well....and a custom mounting bracket from Bob at aeicnc.com
he makes several different brackets to mount the Moroso Vacuum pumps
it is also required that you buy an ATI crank Damper with a special hub that is made to use with the Moroso Pump...
it will cost you quite a bit more than the $100 Header Evac system...but it will also be guaranteed to work 10x better than the header evac system as well.
If you contact bob, he can tell you specific details about what you need for a complete system and he can get you prices..
basically...
Moroso Pump and Bracket
ATI Damper with Hub
Catch Can
Valley Cover
custom baffles or a really good oil/air separator
some fittings and Hose (12an)
Belt for Pump
Pressure relief valve
a little bit of patience and time.
and a way to measure how much vacuum you are actually making (make too much and you suck the oil right off the wrist pins of the pistons and damage your engine...)
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Hey guys, I did this exact setup on my LT1 car years ago. I would not recommend doing this on a street car with a full exhaust. I couldn't get enough localized vacuum with full exhaust and in fact ended up pressurizing the crankcase at high RPM. It was a worthwhile experiment, but I ended up capping off the ports in the headers and going back to a regular breather/catch can setup. A Vacuum pump should work though.
Hey guys, I did this exact setup on my LT1 car years ago. I would not recommend doing this on a street car with a full exhaust. I couldn't get enough localized vacuum with full exhaust and in fact ended up pressurizing the crankcase at high RPM. It was a worthwhile experiment, but I ended up capping off the ports in the headers and going back to a regular breather/catch can setup. A Vacuum pump should work though.
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Hmmmm, for a non-emissions street car this might have some merit. Thinking about my 1965 Buick Skylark with a L92 motor.
