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Car Forum / Antique and Collectibles / Studebaker / February 2006Distributor Vacum Advance/R4
I would like to try using a vacum advance unit on the distributor of my R4 engine. It has the correct carb. front and rear and the rear carb has a plug where the vacum advance would go on a R1, R2 or R3 carb. This is factory. If I were to put a vacum advance on the distributor that is set up centrifugal, any ideas where I would pick up the correct amount of vacum other than the carb? I hate to mess witht the original carb. There is a T that comes off the intake manifold. One is plugged and the other goes to the choke. I was thinking this may be a source but also thought it may have too much vacum? The vacuum at the carb is totally different than manifold vacuum. I don't know the details but I know that manifold vacuum won't work. The vacuum from the carb is taken from the the throat area and basically works in reverse of manifold vacuum I think. Tim K. R4's don't make much vacuum so that is why they didn't use it. Most cars used ported vacuum at the Carb, which means there was no vacuum advance at idle. Some cars used full manifold vacuum at the carb, but you could also use the T. You woul then have high advance at idle and the idle speed would jump way up. With dual carbs, you might not be able to close them down enough to set the idle speed. You could try it and see what happens. The only purpose of vacuum advance is better mileage and yours will be shitty either way. The car would also run cooler with vacuum advance. >I would like to try using a vacum advance unit on the distributor of my > R4 engine. It has the correct carb. front and rear and the rear carb [quoted text clipped - 5 lines] > and the other goes to the choke. I was thinking this may be a source > but also thought it may have too much vacum? a SIMPLE WAY TO FIND THE RIGHT PORT IS TO USE A VACCUME GAGE put the gage on the port in question and start your vehicle. If the vaccume rading increases as you raise the idle speed then you have trhe right port. some carbs have two sources for increasing vaccume that can be used they can be either venturi or ported vaccume either will work but which you use will depend on the rating of the advance unit that you install....meaning how much vaccume does it take to move the advance though its stroke. |
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