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You would be better off to use a vac pump on the
street... with a exhaust system it would have to
be a VERY low restriction to allow a header vac to work

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You would be better off to use a vac pump on the
street... with a exhaust system it would have to
be a VERY low restriction to allow a header vac to work

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i am planning on running a evac system as i had the tubes welded into my 2" tti's already.. I plan on going 3.5" exhaust with dynomax bullets..

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You would be better off to use a vac pump on the
street... with a exhaust system it would have to
be a VERY low restriction to allow a header vac to work

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i am planning on running a evac system as i had the tubes welded into my 2" tti's already.. I plan on going 3.5" exhaust with dynomax bullets..

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I dont recall what the restriction is on all of the
assorted muffs but the lower the restriction the better
the evac will work. A evac will pull about 5" hg
max and for every in hg that your exhaust has it
will lower the evac value

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Does anyone make brakets for the vacuume pump that will work with Alt. and power sterring?

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That I do not know

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40... hmmm..... how much are vac pumps...

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You would be better off to use a vac pump on the
street... with a exhaust system it would have to
be a VERY low restriction to allow a header vac to work

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2" tti's w/3" tti x-pipe system and ultra flow mufflers.

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I have the same exhaust set-up and have the evac kit sitting on the shelf, but I am very scared to try it!

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You would be better off to use a vac pump on the
street... with a exhaust system it would have to
be a VERY low restriction to allow a header vac to work

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2" tti's w/3" tti x-pipe system and ultra flow mufflers.

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I have the same exhaust set-up and have the evac kit sitting on the shelf, but I am very scared to try it!

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All I can say is try it, if it fails cap off the
nipple in the headers with a pipe cap

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You would be better off to use a vac pump on the
street... with a exhaust system it would have to
be a VERY low restriction to allow a header vac to work

---

2" tti's w/3" tti x-pipe system and ultra flow mufflers.

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I have the same exhaust set-up and have the evac kit sitting on the shelf, but I am very scared to try it!

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All I can say is try it, if it fails cap off the
nipple in the headers with a pipe cap

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I ran a Moroso evac on my Cuda with the blower. I had 2" Super Comps and 3" exhaust that exited right in front of the rear wheels and used the Bullets. The evac didn't work for me. Among other internal problems, I had valve cover and oil pan gasket leaks..I haven't figured out what I want to do with the Dak. It has 2" fenderwell headers,3" exhaust pipe and Bullets. Exits in front of the rear tires.. Kinda coincidental here.. The gaskets are seeping a little. I may pull the engine and install new gaskets before the tracks open..

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Put a vac/pressure combo gauge on the engine. If you
are making pressure you either give it more venting
(breathers) or put a vac pump on it.... of course
this is if the engine isnt messes up inside like
broken rings

Wedge
If you pull the breather off the valve cover and
rev it up a few revs you should feel it on your hand
(sucking), if its not working you will feel it blowing
on your hand(this is the part with the hose on it)
also if its broken/failed the air will be hot(exhaust)

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So I have been wondering, what is the best way to vent the crank case on a street strip car?
Thanks alot

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My setup ; raised breathers with baffled valvecovers and baffled tubes.


Ron

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I ran a Moroso evac on my Cuda with the blower. I had 2" Super Comps and 3" exhaust that exited right in front of the rear wheels and used the Bullets. The evac didn't work for me. Among other internal problems, I had valve cover and oil pan gasket leaks..I haven't figured out what I want to do with the Dak. It has 2" fenderwell headers,3" exhaust pipe and Bullets. Exits in front of the rear tires.. Kinda coincidental here.. The gaskets are seeping a little. I may pull the engine and install new gaskets before the tracks open..

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Put a vac/pressure combo gauge on the engine. If you
are making pressure you either give it more venting
(breathers) or put a vac pump on it.... of course
this is if the engine isnt messes up inside like
broken rings

Wedge
If you pull the breather off the valve cover and
rev it up a few revs you should feel it on your hand
(sucking), if its not working you will feel it blowing
on your hand(this is the part with the hose on it)
also if its broken/failed the air will be hot(exhaust)

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I ran a Moroso evac on my Cuda with the blower. I had 2" Super Comps and 3" exhaust that exited right in front of the rear wheels and used the Bullets. The evac didn't work for me. Among other internal problems, I had valve cover and oil pan gasket leaks..I haven't figured out what I want to do with the Dak. It has 2" fenderwell headers,3" exhaust pipe and Bullets. Exits in front of the rear tires.. Kinda coincidental here.. The gaskets are seeping a little. I may pull the engine and install new gaskets before the tracks open..

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Put a vac/pressure combo gauge on the engine. If you
are making pressure you either give it more venting
(breathers) or put a vac pump on it.... of course
this is if the engine isnt messes up inside like
broken rings

Wedge
If you pull the breather off the valve cover and
rev it up a few revs you should feel it on your hand
(sucking), if its not working you will feel it blowing
on your hand(this is the part with the hose on it)
also if its broken/failed the air will be hot(exhaust)

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funny you say that as i bought a vac/pressure guage today...... are you saying when the engine is runnin it can show pressure not vacuum if the evac syatem isnt working also...

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I dont have any type of hookup on the back of the valve covers... what about the back of the intake manifold?

edit. hooking it up to the VC gives out a pressure reading instead of vac reading...

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The intake is NOT part of the crank case, the valve
cover is(via the intake valley and down thru the
cam tunnel) you want the crank case
EDIT
If you have cast covers you can drill and tap it,
if sheet metal you can do a extruded hole(punch it
with a pointed punch and push the metal inward, then
tap it lightly with a 1/8" pipe tap just to get a
start thread then start a 1/8" pipe fitting that will
hook up to your gauge(put some sealant on the fitting

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whats the point of a PCV then if the header evac dont work....

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whats the point of a PCV then if the header evac dont work....

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It takes the crankcase fumes and recycles them into the intake to get burned again. It will never create vacumm in the engine because it has a breather on the other valve cover to supply fresh air into the engine.

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I had a pcv on my old setup. some on here dont even run them..... are they really needed and i read somewhere that on a big hp setup the pcv going back into the intake can be bad going back down the ports???

thoughts

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I've always wondered what the differnce is between a pcv valve and a huge vacuum leak...

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It has a controlled orfice which you over come when
setting the carb

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gotch ya p..... but how did you hook up to the VC.... weld a fitting onto it or something....

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I use a cast cover and I drilled and taped it for
1/8" pipe

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the one guya above just runs 2 breathers...

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Understand something..... he will NEVER create a vac
in the crank case, the most that he can do is get to
0 pressure. The purpose of a vac source is create a
vac to help seal the rings

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So I have been wondering, what is the best way to vent the crank case on a street strip car?
Thanks alot

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My setup ; raised breathers with baffled valvecovers and baffled tubes.


Ron

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so this wont hurt anything really just doesnt creat a vacuum... but I like i said before i read a pcv can be bad running back into the intake and cause plug misfire or something...

and a improperly working header evac setup will cause to much pressure and cause motor leaks..

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I was following post so I hooked up a vacuum gauge to my sb running a header evac & found 1/2" HG total vac , went strait to header with gauge and had 2" total at 4500 rpm ,how much vacuum is needed to have any gain?

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If you are reading any vac on the engine you are getting
a gain...anything - of 0 is a gain

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the one guya above just runs 2 breathers...

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Understand something..... he will NEVER create a vac
in the crank case, the most that he can do is get to
0 pressure. The purpose of a vac source is create a
vac to help seal the rings

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Agreed Mr.P, there is zero vacuum with a dual breather setup. How much vacuum does the typical engine have at WOT ?

PCV is nothing more than a controlled vacuum leak. I'm not a fan of introducing oil mist into the induction system.



Ron

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so this wont hurt anything really just doesnt creat a vacuum... but I like i said before i read a pcv can be bad running back into the intake and cause plug misfire or something...

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The dual breather system will allow the crankcase to ventilate itself. What do you think works better ; forcing all the crank case pressure through a 3/8in hose or letting it escape through a pair of 1.5in tubes w/breathers.

The bottom vent breathers can create a mess so that's why mine are raised on the VC....to allow for drainback.

Different strokes for different folks.




Ron

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Hey,

So I have been wondering, what is the best way to vent the crank case on a street strip car? I have a solid cammed 493 street/strip engine. Right now I am running a breather on one side and a pcv on the other. Are there better ways to do it?
Dual breathers?
Crank case evac using the headers?
Vacume pump?

Thanks alot

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Hey,

So I have been wondering, what is the best way to vent the crank case on a street strip car? I have a solid cammed 493 street/strip engine. Right now I am running a breather on one side and a pcv on the other. Are there better ways to do it?
Dual breathers?
Crank case evac using the headers?
Vacume pump?

Thanks alot

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this may not help anyone but let me tell you what happened to me and maybe someone will be able to tell me what happened.
I had a moroso crank case / header evacuation setup on my 68 GTX.Car ran mid- high 11's and we went to a track for a muffler race. I had an exhaust system put on the car 2-1/2 " with flowmasters.Man it sounded good and when I made a pass it was a SECOND slower,and it blew the intake valley pan up like some stovetop popcorn,all bulged up and blew out the valve cover gaskets!! Unhooked the exhaust and back to 11.70--

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Very simple, your 2 1/2" with Flowmasters had more
back pressure than 5"hg, once you got on it it went
above 5"hg and the back pressure burnt out the check
valves and pressurized the crank case

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this may not help anyone but let me tell you what happened to me and maybe someone will be able to tell me what happened.
I had a moroso crank case / header evacuation setup on my 68 GTX.Car ran mid- high 11's and we went to a track for a muffler race. I had an exhaust system put on the car 2-1/2 " with flowmasters.Man it sounded good and when I made a pass it was a SECOND slower,and it blew the intake valley pan up like some stovetop popcorn,all bulged up and blew out the valve cover gaskets!! Unhooked the exhaust and back to 11.70--

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