Vapor Lock 101 ?

[Bob A.]

"By the way, when the motor was running bad, it could idle O.K."
How could a car run good at Idle with Vapor Lock?
Larry B. hit it on the head. Remember guys, I'm a "non believer" of vapor lock in a gravity fed system. Oh by the way I was out with my coupe today here on Long Island N.Y. Temp 92* in the shade very humid and in traffic with 160*thermostat and 50-50 anti-freeze. The temperature gauge never went over 180*

[marc hildebrant]

Originally Posted by Bob A.

"By the way, when the motor was running bad, it could idle O.K."
How could a car run good at Idle with Vapor Lock?
Larry B. hit it on the head. Remember guys, I'm a "non believer" of vapor lock in a gravity fed system. Oh by the way I was out with my coupe today here on Long Island N.Y. Temp 92* in the shade very humid and in traffic with 160*thermostat and 50-50 anti-freeze. The temperature gauge never went over 180*

Bob,

What I believe is that the flow of fuel has been reduced greatly due to the formation of vapor in the line/carb. What I found was that the car would idle, but with the smallest clutch action to drive, it would run very rough.
However, the adjustment of the GAV about 1 to 2 turns richer helped some.

Also, the water temp was around 190.

Marc