Re: Highway speeds/engine rpm/ gearing and other stuff

Posted by Rusty O\'Toole On 2013/3/30 23:28:24

70 may be possible but going over 55 kills your mileage. With the old long stroke engine and low gearing slowing down to 55 can increase your mileage nearly 50%.

In your case you need to tune up your engine and rebuild the carburetor. Maybe your fuel pump has too much pressure. Something is not right if it is burning that much gas and sooting up the engine.

Ordinary speedometers can be quite accurate. Today it is easy to check them with a GPS but a stopwatch will do. It used to be that if your speedo was dead accurate at sixty it might be out 1 or 2 MPH at 30, or vice versa. If it was off at all speeds it meant you needed to correct it by changing the speedo drive gear in the transmission. A speedo shop could do this in a few minutes.