Re: 1948 Deluxe 2262 engine vacuum lines
Posted by HH56 On 2013/11/15 20:03:46
Why they would mess with the vac advance is a question --- unless that can is for some kind of aftermarket pollution device. I know there were some of those aftermarket devices that messed with timing advance to try and lessen oxides of nitrogen emission. Coming straight off the pump, I don't think that very likely but you never know. Perhaps it was some attempt to increase vacuum to the motor. You would have to trace things very carefully to try and determine exactly where it goes and what it does.
Here are a couple of illustrations from parts manual. I drew in a basic approximation of the wiper vacuum supply. The photo is one provided by BDeB & shows the rest of the wiper supply route and the take off for vac antenna. Typically, the other side of wiper motor connection is for the optional windshield washer -- but that use depends on the particular washer installed.
Normal operation is the intake manifold supplies the vacuum. When the engine is under load or throttle is nearly wide open, vacuum drops enough that wiper motor can stop. The pump is in series with the intake manifold source so if vacuum drops from intake manifold, pump will take over and provide a lesser amount but still enough to keep the wipers going at a reduced speed.
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Here are a couple of illustrations from parts manual. I drew in a basic approximation of the wiper vacuum supply. The photo is one provided by BDeB & shows the rest of the wiper supply route and the take off for vac antenna. Typically, the other side of wiper motor connection is for the optional windshield washer -- but that use depends on the particular washer installed.
Normal operation is the intake manifold supplies the vacuum. When the engine is under load or throttle is nearly wide open, vacuum drops enough that wiper motor can stop. The pump is in series with the intake manifold source so if vacuum drops from intake manifold, pump will take over and provide a lesser amount but still enough to keep the wipers going at a reduced speed.
Attach file:
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