GREENBIRD56
Member
this is the early four barrel manifold....
the PCV screws in a port drilled into both plenums
the PCV screws in a port drilled into both plenums
Ford Y Block PCV System
- Thread starter all american boy
- Start date
KULTULZ
Well-known member
this is the early four barrel manifold....
the PCV screws in a port drilled into both plenums
As long as the signal is sourced to distribute evenly the drawn fumes, all is well (IMO).
Of all the things to do to make an engine ugly (IMO) is to put the system on rocker covers.
Even the early SBF and FE/MEL had a hidden system.
KULTULZ
Well-known member
It is done very tastefully...
OH!... BTW
PCV valves are calibrated to needed designed airflow (carb mixture calibration). I would use the MOTORCRAFT valve designed for this application. Anything else may throw mixture calibration off and you have to make allowances.
all american boy
Well-known member
kultulz
here's a Fram Ford 90 degree PCV valve.
http://www.summitracing.com/parts/FRM-FV202/
looks like it's for '62 and up small blocks.
$1.95! i might get two spares to put in rollaway!
that's close enough for any y block.
have a good one!
here's a Fram Ford 90 degree PCV valve.
http://www.summitracing.com/parts/FRM-FV202/
looks like it's for '62 and up small blocks.
$1.95! i might get two spares to put in rollaway!
that's close enough for any y block.
have a good one!
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GREENBIRD56
Member
KULTULZ was getting down to it with his comments about sizing - the PCV is a "controlled" vacuum leak. Depending on the engine vacuum and the amount of restriction in the PCV passages, you can get a varying amount of air flowing "around" the carburetor. If you change carbs and intakes, the original may not be just what you need.
The same Ford screw-in PCV that fits in the manifold I showed earlier didn't work at all when installed in the rear valley pan vent (draft tube opening) of my T-bird 312. Idle RPM went up in the neighborhood of 700-750 rpm and I couldn't tune it out - acted like a big vacuum leak - which it was. After looking through a handfull of the dumb things, I came to the (DUH) conclusion that all the PC valve was, was a checkvalve to prevent backfires from pressurizing the engine interior - and otherwise it was open suction, orficed by the way it was mounted, piped and internally ported. So I tried a few different orfices hidden in the piping until the carb tuning came back under control (and I still had a bit of constant vacuum on the PCV inlet).
The same Ford screw-in PCV that fits in the manifold I showed earlier didn't work at all when installed in the rear valley pan vent (draft tube opening) of my T-bird 312. Idle RPM went up in the neighborhood of 700-750 rpm and I couldn't tune it out - acted like a big vacuum leak - which it was. After looking through a handfull of the dumb things, I came to the (DUH) conclusion that all the PC valve was, was a checkvalve to prevent backfires from pressurizing the engine interior - and otherwise it was open suction, orficed by the way it was mounted, piped and internally ported. So I tried a few different orfices hidden in the piping until the carb tuning came back under control (and I still had a bit of constant vacuum on the PCV inlet).
all american boy
Well-known member
y blockers
here's how a PCV system and the PCV valve work.
http://en.wikipedia.org/wiki/Pcv_valve.
putting a later type PCV system on is
for High Performance y blocks.
it can be used on restored cars if you
save all your old parts for one you sell the car.
an original PCV system is pretty close in doing a good
job as the later setup.
have a nice day!
here's how a PCV system and the PCV valve work.
http://en.wikipedia.org/wiki/Pcv_valve.
putting a later type PCV system on is
for High Performance y blocks.
it can be used on restored cars if you
save all your old parts for one you sell the car.
an original PCV system is pretty close in doing a good
job as the later setup.
have a nice day!