rmcphearson
Well-known member
As discussed in another thread my '62 170 is seeping coolant from the head gasket on the driver's side. But before I schedule the gasket job I'm trying to unravel some other general carb and distributor mysteries.
1) My vacuum gauge is not indicating any vacuum from the port on the passenger side of the Autolite 1100 while idling or revved up. A hose runs from this port to the distributor diaphragm. My gauge works, I can move the needle to 5 in. by sucking on it. I've been adjusting the carb screw for max rpms while idling. I can't use the vacuum gauge because it doesn't read anything. The rpms max with the screw 2 full turns out. If I unscrew it further (several turns) the rpms do not change. Aren't the rpms supposed to drop and the engine start to stumble as I unscrew it too far?
2) The engine pings under load. If there is no vacuum at the carb port that runs to the distributor does that explain why it's pinging? Because the timing is always advanced?
-Roland
1) My vacuum gauge is not indicating any vacuum from the port on the passenger side of the Autolite 1100 while idling or revved up. A hose runs from this port to the distributor diaphragm. My gauge works, I can move the needle to 5 in. by sucking on it. I've been adjusting the carb screw for max rpms while idling. I can't use the vacuum gauge because it doesn't read anything. The rpms max with the screw 2 full turns out. If I unscrew it further (several turns) the rpms do not change. Aren't the rpms supposed to drop and the engine start to stumble as I unscrew it too far?
2) The engine pings under load. If there is no vacuum at the carb port that runs to the distributor does that explain why it's pinging? Because the timing is always advanced?
-Roland