Quote:
Originally Posted by HWYSTR455
That's what I was trying to get at, vacuum at highway speed. You figure 65-70 mph, M-21, 3.42 gears, that's got to be in the 3000+ RPM range, but the kicker is, throttle position.
You're probably at 1/2 throttle, with the blades open that far, I bet you have less than 8, if not less than 6" of vacuum. So no vacuum advance. That's why it runs hot at highway speeds.
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Very interesting. I'll hook up a gauge. I will say this, when I was using a different vacuum can that wasn't fully engaging at highway speed, that's when I was getting the "trailer hitch" surging, which went away when I changed to this can.
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Adam
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1964 LeGTO
469, M21, 3.42
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