Home Made Vacuum Gauge Synchronizer
by Bill Murrin
I have made a cheap carb synchronizer out of a vacuum gauge, 3/16ths" tubing, four screw aquarium valve and a home made plenum. The gauge($8) is from Harbor Freight and the aquarium valve($4) is from my local fish store. The plenum tank is just PVC pipe with a couple of brass taps screwed into it($3). The plenum was used to
dampen the fluctuation of the needle on the vacuum gauge.
![20020830-mysyncrotool.jpg Click image for larger version Name: 20020830-mysyncrotool.jpg Views: 0 Size: 83.1 KB ID: 860322](filedata/fetch?id=860322&d=1604268333)
Here is one of the brass plenum fittings:
![20020830-brassplenum.jpg Click image for larger version Name: 20020830-brassplenum.jpg Views: 0 Size: 31.9 KB ID: 860323](filedata/fetch?id=860323&d=1604268383)
Closer shots of the gauge and valve:
![20020827-synchrovalve.jpg Click image for larger version Name: 20020827-synchrovalve.jpg Views: 0 Size: 81.6 KB ID: 860324](filedata/fetch?id=860324&d=1604268421)
![20020830-gaugeinuse.jpg Click image for larger version Name: 20020830-gaugeinuse.jpg Views: 0 Size: 100.4 KB ID: 860325](filedata/fetch?id=860325&d=1604268457)
Operation: Adjust each carb by turning on the valve that is connected to it's manifold while the other three are closed. This takes a little longer than the mercury sync but it is cheap and you can open the throttle as much as you like without worry of ingesting mercury.
![20020830-synchroinuse.jpg Click image for larger version
Name: 20020830-synchroinuse.jpg
Views: 259
Size: 81.7 KB
ID: 860326](filedata/fetch?id=860326&d=1604268779)
If I had it to do over again I would make the plenum out of larger diameter PVC and have a threaded cap on one end so all the parts would fit inside.
by Bill Murrin
I have made a cheap carb synchronizer out of a vacuum gauge, 3/16ths" tubing, four screw aquarium valve and a home made plenum. The gauge($8) is from Harbor Freight and the aquarium valve($4) is from my local fish store. The plenum tank is just PVC pipe with a couple of brass taps screwed into it($3). The plenum was used to
dampen the fluctuation of the needle on the vacuum gauge.
Here is one of the brass plenum fittings:
Closer shots of the gauge and valve:
Operation: Adjust each carb by turning on the valve that is connected to it's manifold while the other three are closed. This takes a little longer than the mercury sync but it is cheap and you can open the throttle as much as you like without worry of ingesting mercury.
If I had it to do over again I would make the plenum out of larger diameter PVC and have a threaded cap on one end so all the parts would fit inside.