Street cars, what PCV setup are you running?
07-26-2011, 04:28 PM
#1
Street cars, what PCV setup are you running? I tried running breathers but the ac is pulling in the fumes from the engine bay now, so I'm thinking about keeping the breathers, but hooking up the pcv valve again, except with the truck pcv valve going into my catch can to keep the breathers from puffing under normal driving.
Truck PCV on the right
Truck PCV on the right
07-27-2011, 06:11 AM
#7
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Stock as stock can be.
The overwhelming consensus is a stock PVC system is not able to handle the normal blow by duties of a heavily modified engine therefore there is oil reversion through the breather tube, into the plenum and if it's bad enough, into the intake ports. If it's bad enough even a breather will give signs of abnormal blow by with a lovely oily mist all over the engine bay or puffs of oil smoke through every engine orifice exposed to crankcase pressures. With a breather, the engine is no longer fully dependent on the PCV system getting rid of any positive pressures. IMO it's more of a bandaid than anything. Right, Mr. speed_demon24?
If you do spot any sort of oil gunk or mist around the breather tube, on the throttle body, see or feel a positive pressure out of your oil fill with the PCV properly functioning it would be a good idea to get a leakdown done.
Aside from taking care of positive pressures it also creates a vacuum w/in the engine, thus less air for the rotating assembly to move around which equals less parasitic losses.
The overwhelming consensus is a stock PVC system is not able to handle the normal blow by duties of a heavily modified engine therefore there is oil reversion through the breather tube, into the plenum and if it's bad enough, into the intake ports. If it's bad enough even a breather will give signs of abnormal blow by with a lovely oily mist all over the engine bay or puffs of oil smoke through every engine orifice exposed to crankcase pressures. With a breather, the engine is no longer fully dependent on the PCV system getting rid of any positive pressures. IMO it's more of a bandaid than anything. Right, Mr. speed_demon24?
If you do spot any sort of oil gunk or mist around the breather tube, on the throttle body, see or feel a positive pressure out of your oil fill with the PCV properly functioning it would be a good idea to get a leakdown done.
Aside from taking care of positive pressures it also creates a vacuum w/in the engine, thus less air for the rotating assembly to move around which equals less parasitic losses.
Last edited by SS RRR; 07-27-2011 at 06:30 AM.
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07-27-2011, 07:26 AM
#10
while your usual pcv system is jusstttt about capable of evacuating the crank case a vacuum pump can actually pull a vacuum in the crank case.......mine is aobut 17" inhg at high rpm........it also allows me to run a looser oil control ring and still seal to the cylinder...less resistance = more power........also remember things move easier in a vacuum......less air = less resistance to moving espically when you have something like the bottom of a piston that looks like a parachute............also i haven't had a drip of oil come out of any seal on this motor in 3 years!! lol...........a vacuum pump is worth a few hp also
07-27-2011, 10:26 AM
#11
Stock as stock can be.
The overwhelming consensus is a stock PVC system is not able to handle the normal blow by duties of a heavily modified engine therefore there is oil reversion through the breather tube, into the plenum and if it's bad enough, into the intake ports. If it's bad enough even a breather will give signs of abnormal blow by with a lovely oily mist all over the engine bay or puffs of oil smoke through every engine orifice exposed to crankcase pressures. With a breather, the engine is no longer fully dependent on the PCV system getting rid of any positive pressures. IMO it's more of a bandaid than anything. Right, Mr. speed_demon24?
If you do spot any sort of oil gunk or mist around the breather tube, on the throttle body, see or feel a positive pressure out of your oil fill with the PCV properly functioning it would be a good idea to get a leakdown done.
Aside from taking care of positive pressures it also creates a vacuum w/in the engine, thus less air for the rotating assembly to move around which equals less parasitic losses.
The overwhelming consensus is a stock PVC system is not able to handle the normal blow by duties of a heavily modified engine therefore there is oil reversion through the breather tube, into the plenum and if it's bad enough, into the intake ports. If it's bad enough even a breather will give signs of abnormal blow by with a lovely oily mist all over the engine bay or puffs of oil smoke through every engine orifice exposed to crankcase pressures. With a breather, the engine is no longer fully dependent on the PCV system getting rid of any positive pressures. IMO it's more of a bandaid than anything. Right, Mr. speed_demon24?
If you do spot any sort of oil gunk or mist around the breather tube, on the throttle body, see or feel a positive pressure out of your oil fill with the PCV properly functioning it would be a good idea to get a leakdown done.
Aside from taking care of positive pressures it also creates a vacuum w/in the engine, thus less air for the rotating assembly to move around which equals less parasitic losses.
07-27-2011, 10:46 AM
#12
Anyone know if there's a way to use the stock AIR pump as a vacuum pump, I seem to recall seeing or reading about it somewhere, anyone have any details or pics of how to do this?
