I have been researching if I should use this on my h build and i dont see too much info on it. My reasoning is that running a normal PCV setup can possibly upset A/F ratios, how much idk either way if its going to help me in anyway to me its worth it. However i did see what they did on old cars and some drag cars actually use it. A dump tube where you run a line off the pcv valve using a check valve inline to prevent damage from backfire and route it into the exhaust where since the exhaust gas flowing past it will create a lower pressure and the vapors will flow out. It works kind of like a carb main metering circuit works. The only drawback i heard was that it can pull oil out of the crankcase at times. Anyone hear or run this ? Any input on it ?

 

this is the way i want to run my pcv. but i will run it to a catch can first (sealed of course) with some steel wool or somthign in it to get as much oil befoer gettign into the exaust.

im pretty sure RMF had siad hes seen gains of 5 to 6 whp on n/a hondas
more with and electric vaccume pump , but thats a whole other ball game

 

never seen it myself but ppl running it like that by using a slash tube in the exhaust. like machine said, just be sure you have a catch can and a check vaule between there somewhere. good luck.

 

F the pcv throw it in the garbage!!

 

i dont thikn he plans on using it ...he was just using the PCV term as it relates to the discussion

 

well this is still positive crankcase vent. so therefore it is still pcv, just another way of routing it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by toekneevwj &raquo;</TD></TR><TR><TD CLASS="quote">never seen it myself but ppl running it like that by using a slash tube in the exhaust. like machine said, just be sure you have a catch can and a check vaule between there somewhere. good luck.</TD></TR></TABLE>

What exactly is a slash tube ? Another hava any pics of how they did this, im sure i could figure a way out but there may be easier ways to do it.

 

i dont have a pic , but example

take a tube (say just over half inch (dont know what is acceptable) and cut a 45 deg angle on it , then install it into the exaust stream on a 45 deg angle , but set it up so the angle is straight with the flow of the exasut gases . when the exaust go past the tube it will draw the presuuer out of the block.. it works much like the way a carb would

 

yes thats what i said earlier i was wondering on fittings and materials.

 

duhhh lol

i tihkn moroso has a v8 kit , only problem is it comes in pairs

 

http://www.partsamerica.com/Pr...=5001

 

CRANKCASE EVACUATION SYSTEM
Designed primarily for drag race applications, this crankcase evacuation system is designed to reduce pressure build-up in the engine crankcase. This provides a better piston ring seal, less intake charge contamination, and reduces oil leaks caused by high crankcase pressures, while increasing engine performance. Kit includes two chrome plated Mopar style push-on valve cover breathers, two breather grommets, two check valves and two 3 1/2" long, 45 degree cut/threaded tubes, which must be welded into collectors.

How is that supposed to reach the exhaust though or am i going to have to buy more piping ?

Anyone else have any info on this idea ? Problems/ benefits ?

 

ok i have an idea. Here is goes...run the pcv valve in the valve cover from that run a rubber hose a hardline that will be welded into the exhaust, leaving about 3-4 inches of it to leave some distance from the exhaust so the rubber doesnt melt and also put a check valve inline somewhere there. Does the tip of the hardline that i am welding into the exhaust have to have a 45 degree cut on it in the exhaust in order for this to work properly ?

 

here a quick paint lol
this is how i think it should be . but hopefully somone can chime in

 

should be mounted near the collector with no cat, if there is a cat i thikn its supposed to be after the cat


id also like ot know how far into the stream it would need to be . i dont thikn flush would work due to "boundry layer" (not sure if it aplies to exaust or not....in my head it does lol)
seems that if its to far in the pipe that it may not evac right , and cause flow issues in the exaust itself

 

so we need to angle the tip on a 45 ? Also will the pcv valve itself function like a check valve ?

 

i hollewd mine out , for better flow, but i will go to AN fittings near the front of the cover
i just dont thikn there is enough room on the pcv to take it lall out

 

ok i understand what you are saying about the angle now. The question now just is how far into the exhaust and could i use a pcv valve as well as a check valve inline, both would function as a check valve basically correct ?


Modified by lude98SH at 6:37 AM 7/3/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by toekneevwj &raquo;</TD></TR><TR><TD CLASS="quote">never seen it myself but ppl running it like that by using a slash tube in the exhaust. like machine said, just be sure you have a catch can and a check vaule between there somewhere. good luck.</TD></TR></TABLE>

Why would you want a catch can inline ....isnt that the point of doing this so you dont run a catch can ?

 

mabye catch can isnt the right term , but oil seperator . if you run a sealed catch can it will still work as intended but you need somthign to catch the oil before it hits the exaust and i looks like you running a 14b turbo on there lol

 

lol i never thought of that haha. So either way i need a check valve should i run the original pcv vvalve along with an inline one way check valve ?

 

dont do it, if you have a muffler at the end of your exhaust it wont work like expected. if there is a muffler on the exhaust, the mid section will be pressurized. This isnt vacuum the exhaust is creating to pull gasses, sure its the berneli (sp?) effect, but this mainly works when there is minimal positive pressure in the exhaust (some people refer to it as back pressure, its just positive pressure)

And since things move in the easiest path, that tube could serve as a nice little exit point for when the pressure builds up

Test it out, install the slash cut, run a hose to the engine compartment, if its ALWAYS pulling then your fine.

I prefer electric pump, or OEM since thats always under some vac.

 

no muffler or cat just a resonator

 

bump

 

This is the 3 proper ways to mount the evacuation tubes into the exhaust. You do NOT want the cut to face perpendicular to flow.