Vented Valve Cover Post up some pics!
04-30-2007, 07:01 PM
#1
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Vented Valve Cover Post up some pics!
I've been doing alot of searching and havent found any info or write-ups on the vented valve covers. I personally am looking to do one not just for the look but for the benifit. Im trying to start this just to give everyone some ideas on some diffrent ways to vent..
Lets see them!
Lets see them!
05-01-2007, 06:02 AM
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Re: Vented Valve Cover Post up some pics! (turbociviccoupe)
Now i have not researched much on the topic in discusion. but my question is why do the fittings have to be so large? does there need to be that much pressure/ air releaved? it seems to me that fittings half that size would suffice...
05-01-2007, 06:03 AM
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Re: Vented Valve Cover Post up some pics! (tepid1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 »</TD></TR><TR><TD CLASS="quote">The most traditional and effective way....
</TD></TR></TABLE>
Very Nice! The fuel line for the rail you make your self or pick up a kit?
</TD></TR></TABLE>Very Nice!
The fuel line for the rail you make your self or pick up a kit?
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05-01-2007, 07:31 AM
#8
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Re: Vented Valve Cover Post up some pics! (91jdmhatchback)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91jdmhatchback »</TD></TR><TR><TD CLASS="quote">Now i have not researched much on the topic in discusion. but my question is why do the fittings have to be so large? does there need to be that much pressure/ air releaved? it seems to me that fittings half that size would suffice... </TD></TR></TABLE>
The larger the hose/fittings the less likely that you will carry oil with the blowby air. I wouldn't run anything smaller than -10AN. Big HP cars.... at least -12AN.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondaruss »</TD></TR><TR><TD CLASS="quote">
Very Nice! The fuel line for the rail you make your self or pick up a kit?</TD></TR></TABLE>
There is nothing about this car that is even close to a "kit"....
I do/make everything by myself.
The larger the hose/fittings the less likely that you will carry oil with the blowby air. I wouldn't run anything smaller than -10AN. Big HP cars.... at least -12AN.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondaruss »</TD></TR><TR><TD CLASS="quote">
Very Nice! The fuel line for the rail you make your self or pick up a kit?</TD></TR></TABLE>
There is nothing about this car that is even close to a "kit"....
I do/make everything by myself.
05-01-2007, 01:25 PM
#9
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Re: Vented Valve Cover Post up some pics! (tepid1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 »</TD></TR><TR><TD CLASS="quote">The most traditional and effective way....
</TD></TR></TABLE>
what am i looking at here? what are the blue things?
</TD></TR></TABLE>what am i looking at here? what are the blue things?
05-01-2007, 01:36 PM
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Re: Vented Valve Cover Post up some pics! (Mr.E.G.)
Those are closed AN caps, to keep the motor sealed. The crankcase breathers tubes go in place of the caps.
05-01-2007, 01:39 PM
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Re: Vented Valve Cover Post up some pics! (savestheday)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by savestheday »</TD></TR><TR><TD CLASS="quote">Those are closed AN caps, to keep the motor sealed. The crankcase breathers tubes go in place of the caps.</TD></TR></TABLE>
Correct. I am working on the car and I have the -12AN breather hoses off, so I plug them to prevent foreign material from destroying my motor.
Correct. I am working on the car and I have the -12AN breather hoses off, so I plug them to prevent foreign material from destroying my motor.
05-01-2007, 01:55 PM
#12
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Re: Vented Valve Cover Post up some pics! (tepid1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 »</TD></TR><TR><TD CLASS="quote">
Correct. I am working on the car and I have the -12AN breather hoses off, so I plug them to prevent foreign material from destroying my motor. </TD></TR></TABLE>
ahhhhh. i didnt know what was going on. it looked sealed to me, not like filter.
now i get it.
Correct. I am working on the car and I have the -12AN breather hoses off, so I plug them to prevent foreign material from destroying my motor.
</TD></TR></TABLE>ahhhhh. i didnt know what was going on. it looked sealed to me, not like filter.
now i get it.
05-01-2007, 01:57 PM
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It's an MR2, but here is an exhaust scavange.
Valve Cover to exhaust vent, 3/4" ID tube
One-Way exhaust check valve
Valve Cover Breather
The breather is a fairly small breather and we used it to hopefully create a small vacuum in the crank case will still providing fresh, filtered air. It seems to work though as there is no oil on the filter, yet on the dyno you could clearly see vapor movement in the hose running to the one-way valve.
The point we pulled the scavange from is fully baffled. While there was some oil residue behind the car on the dyno, it was pretty minimal. To me it said the baffle was working pretty well at keeping oil in the motor but the motor was still venting very well.
Valve Cover to exhaust vent, 3/4" ID tube
One-Way exhaust check valve
Valve Cover Breather
The breather is a fairly small breather and we used it to hopefully create a small vacuum in the crank case will still providing fresh, filtered air. It seems to work though as there is no oil on the filter, yet on the dyno you could clearly see vapor movement in the hose running to the one-way valve.
The point we pulled the scavange from is fully baffled. While there was some oil residue behind the car on the dyno, it was pretty minimal. To me it said the baffle was working pretty well at keeping oil in the motor but the motor was still venting very well.
05-01-2007, 05:58 PM
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Re: (99_GS-T)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99_GS-T »</TD></TR><TR><TD CLASS="quote">It's an MR2, but here is an exhaust scavange.
Valve Cover to exhaust vent, 3/4" ID tube
One-Way exhaust check valve
Valve Cover Breather
The breather is a fairly small breather and we used it to hopefully create a small vacuum in the crank case will still providing fresh, filtered air. It seems to work though as there is no oil on the filter, yet on the dyno you could clearly see vapor movement in the hose running to the one-way valve.
The point we pulled the scavange from is fully baffled. While there was some oil residue behind the car on the dyno, it was pretty minimal. To me it said the baffle was working pretty well at keeping oil in the motor but the motor was still venting very well.</TD></TR></TABLE>
can you give me a walk through of your set up in a "for dummies" fashion?
Valve Cover to exhaust vent, 3/4" ID tube
One-Way exhaust check valve
Valve Cover Breather
The breather is a fairly small breather and we used it to hopefully create a small vacuum in the crank case will still providing fresh, filtered air. It seems to work though as there is no oil on the filter, yet on the dyno you could clearly see vapor movement in the hose running to the one-way valve.
The point we pulled the scavange from is fully baffled. While there was some oil residue behind the car on the dyno, it was pretty minimal. To me it said the baffle was working pretty well at keeping oil in the motor but the motor was still venting very well.</TD></TR></TABLE>
can you give me a walk through of your set up in a "for dummies" fashion?
05-01-2007, 07:26 PM
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"Fluid Mechanics For Dummies" version :D
Basically I just made a down hill, one way street for airflow through the engine.
Under load, the exhaust velocity is high enough (in theory) to produce a low static pressure in the exhaust tube. This is from Bernoulli's equation and it basically states that if you speed up a fluids velocity, it will have a lower pressure. Well, it's more complicated then that, but that's the easy version. There is a one-way valve that pokes into the exhaust tube at ~45 degrees inline with the exhaust flow. This valve it to prevent reversion of the exhaust gases into the tube under light load, when the exhaust velocity is not as high.
Under boost, the valve allows air to flow from atmosphere, into the valve cover through the filter. From the other side of the valve cover, air can flow into the exhaust stream due to the aforementioned low static pressure in the tube. It creates a pressure potential to induce fluid motion, thanks to the high velocity of the exhaust gas.
That said, I don't know if I'd try this out on a normal front engine setup. The MR2, being rear engine, has a very short exhaust. I was able to put the nozzle very near the end of the pipe so that there is minimal static pressure loss from the point in the tube where the nozzle is to the atmosphere. On a longer exhaust, or further from the end of the exhaust, there is likely enough pressure drop in the exhaust pipe that the static pressure in the pipe is actually higher then the ambient pressure.
Basically I just made a down hill, one way street for airflow through the engine.
Under load, the exhaust velocity is high enough (in theory) to produce a low static pressure in the exhaust tube. This is from Bernoulli's equation and it basically states that if you speed up a fluids velocity, it will have a lower pressure. Well, it's more complicated then that, but that's the easy version. There is a one-way valve that pokes into the exhaust tube at ~45 degrees inline with the exhaust flow. This valve it to prevent reversion of the exhaust gases into the tube under light load, when the exhaust velocity is not as high.
Under boost, the valve allows air to flow from atmosphere, into the valve cover through the filter. From the other side of the valve cover, air can flow into the exhaust stream due to the aforementioned low static pressure in the tube. It creates a pressure potential to induce fluid motion, thanks to the high velocity of the exhaust gas.
That said, I don't know if I'd try this out on a normal front engine setup. The MR2, being rear engine, has a very short exhaust. I was able to put the nozzle very near the end of the pipe so that there is minimal static pressure loss from the point in the tube where the nozzle is to the atmosphere. On a longer exhaust, or further from the end of the exhaust, there is likely enough pressure drop in the exhaust pipe that the static pressure in the pipe is actually higher then the ambient pressure.
05-02-2007, 06:46 AM
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Re: (99_GS-T)
This was very popular in older club racing circles. It's very efficient at removing PCP (positive crankcase pressure), but was banned by sanctioning bodies like the SCCA do to the horrible mess coming out the exhaust and all over the track if the engine is blown. The big AN stuff with no negetive pressure source seems to work fine for most people, I would just stick with that.
05-05-2007, 10:34 PM
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Re: Vented Valve Cover Post up some pics! (eddie_ek)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eddie_ek »</TD></TR><TR><TD CLASS="quote">Heres my vented valve cover
</TD></TR></TABLE>
</TD></TR></TABLE>
05-07-2007, 06:18 AM
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Re: Vented Valve Cover Post up some pics! (wickedEG)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by haydenpothoven »</TD></TR><TR><TD CLASS="quote">
</TD></TR></TABLE>
Im diggin this setup!
anyone know where i can get a breather box setup for the vented valve cover?
Acully they all look good!
</TD></TR></TABLE>Im diggin this setup!
anyone know where i can get a breather box setup for the vented valve cover?
Acully they all look good!
05-07-2007, 06:44 AM
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Re: Vented Valve Cover Post up some pics! (Hondaruss)
i never really found out the importance to venting the valve cover. drop oil pressure? cleaner oil? dunno! i really only see b16s and b18s with them. I have an h22 prelude, would it be useful to have one. other than that love the setups.
05-07-2007, 06:49 AM
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Re: Vented Valve Cover Post up some pics! (Hondaruss)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondaruss »</TD></TR><TR><TD CLASS="quote">anyone know where i can get a breather box setup for the vented valve cover?
Acully they all look good!</TD></TR></TABLE>
Build your own, thats why its in "welding/fabrication". If there were a perfect off the shelf breather box then everyone would have one. Most commercial available units only have 2 inlet fittings and doesn't adequately support high powered turbo motors.
Acully they all look good!</TD></TR></TABLE>
Build your own, thats why its in "welding/fabrication". If there were a perfect off the shelf breather box then everyone would have one. Most commercial available units only have 2 inlet fittings and doesn't adequately support high powered turbo motors.
