Vaccum line sharing?

rodney007 · Post by **rodney007** » Tue Oct 04, 2011 6:45 pm

Can your BOV, boost gauge, fuel reg run off one vacuum line?

Lummy · Post by **Lummy** » Tue Oct 04, 2011 8:50 pm

Tuners cringe a bit when you run multiple things off a single vacuum/boost line, but in theory, it's all good.

Some may argue it would create a delay to your boost gauge, but compressed air acts pretty quickly. I'd be happy to do it.

Ideally, you'd just tap a few new outlets to your inlet manifold and run a dedicated line for each purpose.

rodney007 · Post by **rodney007** » Wed Oct 05, 2011 12:28 pm

hmmn, well if I can find out if i need to run the PCV valve thingy from the cam cover I can use that .

Entaran · Post by **Entaran** » Thu Oct 06, 2011 3:12 pm

The PCV valve on the cam cover isn't for vacuum broski. It is a vent for oil and will get gummy as fuck. You do NOT want that connected to anything you "like". It generally goes direct to a catch can.

Drill/tap a few new connections on your inlet manifold if you're fresh outta lines, while you're there - replace every vac line in your engine. It's cheap and they're probably old and feral by now anyway.

rodney007 · Post by **rodney007** » Sat Oct 08, 2011 10:17 am

well thankfully my dohc engine is new along with all my vacuum lines etc.

broski I heard PCV valve isn't just a breather like you say. it goes to your intake manifold,. and has a packing or stuffing inside (which i have seen) that restricts flow to aid oil pressure inside the engine,

then, your cam cover breather, goes to a catch can.

Lummy · Post by **Lummy** » Sat Oct 15, 2011 6:57 am

Wow, to aid oil pressure?

The only oil pressure problems I have with my DOHC 4G63 is too much.

I don't know why it's so high, but I get 50-60psi at idle and over 120 on the gas.

My PCV is long gone and I just run lines direct to the catch can.

enthuzed · Post by **enthuzed** » Sat Oct 15, 2011 4:30 pm

Yeah I read that in an earlier post of yours Lummy, that's huge oil pressure!

OLD FART · Post by **OLD FART** » Sun Oct 16, 2011 5:57 am

rodney007 wrote:well thankfully my dohc engine is new along with all my vacuum lines etc.

broski I heard PCV valve isn't just a breather like you say. it goes to your intake manifold,. and has a packing or stuffing inside (which i have seen) that restricts flow to aid oil pressure inside the engine,.

The PCV has ABSOLUTELY NOTHING to do with the oil pressure.
In is a simple device fitted into the rocker cover that has a hose running to the IM that allows fumes to be drawn from the crankcase when the manifold is in vacuum=suction so they can be burnt during the combustion process but closes to seal the CC when positive pressure = boost occurs

Mick · Post by **Mick** » Mon Oct 17, 2011 11:50 am

^^^one way valve in the old money.

rodney have you removed you balance shafts?
removing them ups oil pressure a bit.

rodney007 · Post by **rodney007** » Mon Oct 17, 2011 2:31 pm

so... should I run the pcv line straight to intake manifold? or two lines to my catch tank instead?

ideas?

fugazi · Post by **fugazi** » Mon Oct 17, 2011 4:21 pm

IF you'r using the PCV run it to the mani, AND some lines to a catchtank/can!

Post by **Alspos** » Tue Oct 18, 2011 11:18 am

PCV runs straight into the inlet manifold, under the throttle butterfly.
Catch can is different part of the system, it should run back into the inlet tract, normally just after the air filter. If you connect the two systems, the catch can will become pressurized/vacuum by the PCV system.

rodney007 · Post by **rodney007** » Tue Oct 18, 2011 6:46 pm

ok thanks guys

JAS · Post by **JAS** » Wed Nov 02, 2011 9:52 am

Ive got a vacum distributor in my brake booster line.
Its a nice size hose with a bit of volume. Fine for a BOV and boost gauge etc. Id use a separate vac line straight form the manifold for the fuel reg though.

Austarion

Vaccum line sharing?

Vaccum line sharing?

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