is it necessary to tap Oil fittings on the Valve cover?
i seen some motor builds (like eclipsegst, honda's etc..) tap fittings on the valve cover and the block or oil pan. From what i heard its suppose to reduces crank case pressure. Is this really needed or its only for xx amount of horsepowered cars?
I can only speak concerning the DSM/EVO crowd. I know that pushing high boost (30+psi) would cause the dip stick to pop out. Then, if that issue was fixed, oil could find it's way out of the oil pan through the seal, and so on. It's like, you fix one leak, oil would leak from somewhere else.
Buschur Racing also proved to gain HP on the dyno by relieving pressure from the crankcase on an Evo. They actually recommend doing it on any setup, and getting rid of the stock PCV. Not sure if this helps at all...?..
I can only speak concerning the DSM/EVO crowd. I know that pushing high boost (30+psi) would cause the dip stick to pop out. Then, if that issue was fixed, oil could find it's way out of the oil pan through the seal, and so on. It's like, you fix one leak, oil would leak from somewhere else.
Buschur Racing also proved to gain HP on the dyno by relieving pressure from the crankcase on an Evo. They actually recommend doing it on any setup, and getting rid of the stock PCV. Not sure if this helps at all...?..
i think allot of the high HP cars need vac pumps to keep the crankcase pressure down (or in a high vac) while a PCV system is good you need to remember that any oil vapors will KILL your fuel octane (super fast) I was wondering if exhaust driven vac devices would work for our cars (i hear no on a turbo but....)
The exhaust type does not work on a turbocharged vehicle, due to the lack of scavenging pulses, and certainly no venturi effect. The more 'mechanical' methods do work.
Yea, they run the passenger-side line to a catch can and then to the manifold. The driver-side line to a catch can and then the intake tube. I know my friend whenever he does a build with his honda's, he puts two fittings into the valve cover for ventalation. I mean it can't really hurt anything, our PCV suck on our cars to begin with.
Those pumps posted up, do they just run off of the accessory pulley?
Quote: Originally Posted by Sota
there was a thread by DCR titled something along the lines of "these cars like vacuum all the time" with some good discussions about the topic.
^^ as far as mechanical are you talkin about a pump or something of the sort like what was mentioned above??
Correct, some sort of positive displacement pump. Setting that race pump up to trigger off of a Hobbs switch, once manifold pressure gets above, say 3-5psi, may be a big, big help.
Yea, they run the passenger-side line to a catch can and then to the manifold. The driver-side line to a catch can and then the intake tube. I know my friend whenever he does a build with his honda's, he puts two fittings into the valve cover for ventalation. I mean it can't really hurt anything, our PCV suck on our cars to begin with.
Those pumps posted up, do they just run off of the accessory pulley?
yes the pully driven pumps can be rigged to replace the A/C condensor (if it would fit ) the PCV system on our cars works good while in vacuum but when in boost there is nothing to pull a vacuum on the crankcase, the intake tube will do a little but then you need a restriction (filter) to create the vacuum so it negates the performance of it (kinda) also even if you dont suck straight oil the fumes from the crankcase WILL promote detonation (uneven/uncontroled burn) very very big concern or race cars maxing out that can cause catostrophic failure (snowball effect) not a concern when in manifold vacuum
mocking up a big PCV system to work only at manifold vacuum is counter productive the engine needs it under boost BIG TIME where the rings need sealing
i would be interested in seeing how electric pumps work, everyone i know uses pully pumps (V-8's)
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is it necessary to tap Oil fittings on the Valve cover?
New turbo setup and transmission setup
) the PCV system on our cars works good while in vacuum but when in boost there is nothing to pull a vacuum on the crankcase, the intake tube will do a little but then you need a restriction (filter) to create the vacuum so it negates the performance of it (kinda) also even if you dont suck straight oil the fumes from the crankcase WILL promote detonation (uneven/uncontroled burn) very very big concern or race cars maxing out that can cause catostrophic failure (snowball effect) not a concern when in manifold vacuum
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