Postive Crank Ventilation Valve

[jeffworld2]

isnt 1psi whats above my head right now? you shouldnt have to blow through it at all i thought air was 1 psi

[GeeTR]

isn’t 1psi what’s above my head right now? you shouldn’t have to blow through it at all i thought air was 1 psi

Above your head? all air is 1psi? hehehehe Friday night drinky poo's?

jah prolly mean 1bar, the rough sea level atmospheric pressure yes

Edited November 24, 2006 by GeeTR

[mad082]

atmospheric pressure at sea level is 1 bar.

all boost gauges read pressure and vacuum above and below that pressure.

[l0WRB]

sorry to bring up an old thread. but ive just disconnected my pcv valve hose and put bungs on either end (inlet manifold) (side of rocker cover) and running 2 lines from breathers to catch can...blocking the pcv cannot do any harm can it? also know since ive blocked the pcv ive noticed alot more blow by comin out the filter in the catch can now... hrmmm...with the pcv hooked up could that somehow drop oil into the exhaust side of the car and blow clouds of oil smoke now and then?

[rad100]

i know this is very old, but saves starting a new thread.

as l0WRB stated,

after fitting rb26 rocker covers i have eliminated the pvc valve on my rb25.

this caused MASSIVE blowby, my catch tank filter had oil smoke pouring out of it..

how do i set up a pcv on rb26 covers on a rb25?

[AngryRB]

Don't want to start a new thread so im asking here,

Ive had some rough idle and rough running at very light throttle and trying to hunt the issues down, so I notice my PCV valve hose is cracked, the hoses on the rockers I haven't connected to anything and I noticed theres a fairly strong suction happening there,

is it normal to have a strong vacumn coming from the rocker cover hoses?

would having this hose not recirculating be creating a vacumn leak? eg same as an atmo BOV?

Im wondering if the pcv valve might be open creating the vacumn and therefore creating a vacumn leak,

thoughts?

Edited June 18, 2013 by AngryRBGTX

[Dose Pipe Sutututu]

you are correct, the PCV connects to the plenum, similar to any other vacuum hose but the only difference that seals off on boost to prevent boost leaks.

If you have broken hoses on the PCV connections and leaks on your cam/rocker covers it will affect your idle. To get around this just replace the hoses or completely block off the PCV and run a full atmospheric catch can setup.

[AngryRB]

thanks mate, i think ill seal this PCV valve off to be sure and see what happens, i think this maybe the cause of the car wanting to stall when i quickly come to a stop after a squirt but will have to see .

[Dose Pipe Sutututu]

sounds about right, also are you running a PowerFC?

[AngryRB]

sounds about right, also are you running a PowerFC?

yep and these issues only popped up when i first did the GT30 upgrade and the rocker covers wernt plumbed back into the intake pipe, so makes sense now

Edited June 18, 2013 by AngryRBGTX

[Dose Pipe Sutututu]

if you're having stalling issues after a squirt, there's a menu on the hand controller that allows you to adjust the decel fuel cut off (same page as idle), if you set it a little higher, like around 3k ~4k rpm the motor doesn't hesitate or stall after a good squirt

[Dose Pipe Sutututu]

if anyone's interested:

[Rev. Limit ] レブリミット rpm
[ the F/C A/C ｵ ﾌ ] when decelerating when the air conditioner turns off return rpm of fuel cut
[ the F/C A/C ｵ ﾝ ] when decelerating when the air conditioner turns on return rpm of fuel cut
[ the IDLE A/C ｵ ﾌ ] idling rpm when the air conditioner turns off
[ the IDLE A/C ｵ ﾝ ] idling rpm when the air conditioner turns on

(extracted from paulr33's site)