What's the better PCV location - Ford Bronco Forum
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post #1 of 4 (permalink) Old 05-22-2019, 06:45 AM Thread Starter
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What's the better PCV location

I installed a 5.8L and opted for a Lightning lower intake to support a future Kenne Bell installation.
This lower as a PCV location in the rear of the lower and i still have the PCV location.
i suck oil from both of these locations so I'm not preferring one over the other right now

my questions are:
1) does either location provide better ventilation than other?
2) I've seen setups in which the fuel canister purge vacuum is routed to a type of T at the top of the PCV valve. Any concerns about using this approach? I have limited vacuum ports on the upper intake and this seems like a good T location.
3) Since the PCV location in the lower intake sits below the PCV location on the passenger valve cover, what are the thoughts on this setup to help allow any sucked up oil to drain back:
A) install PCV valve at passenger side valve cover
B) install an open port at the PCV valve location on the lower intake (basically something like a hollowed out PCV valve)
C) install a T between these above to locations and plumb to a vacuum port on the upper.

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post #2 of 4 (permalink) Old 05-22-2019, 06:52 AM
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There may be another option - use a PCV catch can between the PCV valve and vacuum port. You could probably make one or talk to @BigBlue 94 as I think he might make them once in a while.
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post #3 of 4 (permalink) Old 05-22-2019, 08:46 AM
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Yo 92,
Consider, Vacuum Supply Hose Rerouting in 87-93 5.0 Bronco, F Series & vans; Failure of the #8 piston or the #8 rod or rod bearing; "...Failure of the #8 piston or the #8 rod or rod bearing in Ford 5.0L, V-8 gas engines. Solution: During engine installation, reroute the PCV valve vacuum supply hose. Follow these steps: Plug the 3/8" (pipe) thread hole in the rear of the plenum where the PCV valve hose is connected. Drill and tap a 3/8" pipe thread hole in the center of the plenum and thread the PCV connector into it. Reconnect the PCV valve vacuum supply hose to the new location. Be sure the drain hole in the baffle is open. The baffle is under the PCV location in the valve cover. Installers who have rerouted the PCV system and opened the baffle drain hole have not reported any #8 cylinder failures..."
Source: by fourstarengines.com via Four Star remanufactured engines and transmissions - tips

As MS88BRONC advised, see the PCV catch can in Crankcase Breather Jar pic in an 85; "...splice into the line between the PCV and the intake. in between add a jar with 2 holes on top. one is an inlet and the other is an outlet. on the inlet side add a tube with a screen on the end which will trap the oily fumes from the air. so now u have fresh air going into the intake..."




Source: by Chris85xlt (Chris C ( Erika)

Here is the Vacuum Supply Hose Rerouting Discussion in 87-93 5.0
Source: by members at https://www.fullsizebronco.com/forum...-tsb-ford.html

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post #4 of 4 (permalink) Old 05-22-2019, 08:58 AM
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I cant help much with the original questions, but I have made a couple catch cans. The one on my bronco works real well.

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