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And Don didn’t tell HOW or WHY what he did helped either, most here don’t have a clue to those two things. How many here have put a vacuum gage on then watched it while driving, accelerating and decelerating?
It’s all about burn time, advancing the timing starts the flame front sooner so it’s hitting the piston coming up to tdc, more of a push, like spring resistance. The expanding pressure wave meets the piston head on, creating more pressure, the wave doesn’t chase the piston down the cylinder
And why would it be leaner at low speed compared to high speed? Once out of the idle circuits it’s drawing from the main circuits. Now I can see a richer mixture when the vacuum drops by pressing the pedal fast then the rods move out to allow more fuel but RPMs don’t necessarily make it richer.?
“If the ported vacuum advance helped mileage, it did so by using LESS fuel, right“
I don’t think so, just helped burn better. Very crude then, dump the fuel in. computer managed now, more efficient.
Would like to see one of those ‘emission’ thingys from the fifties. Heck nobody heard of pollution till LA started bitchn about the smog in middle 60s. If that is what you read on the internet we surly have lost
What I was going to say! ALL Chrysler’s WERE ported (off idle) till the 73 emission junk came about with the firewall piece and the electric aided dist in 70. good god man we were alive and working on them then.
I didn’t read all these post but I hope you people understand what a VACUMN advance does. It’s like that carb accelerator pump, gives the engine a boost to get moving. It’s there to help before the centrifugal advance part of the dist. starts moving. Furthermore I’ll go with what Chrysler...
I would take it from you and gut it then put a regular battery inside. The type I need for my 66. You cut it up and I’ll buy it, lighter to ship then and less toxic.