Packard Forum Index » Post-War (1946-54)

Sorry to hear about the conversion to 12-volt, unless you're adding aftermarket AC it really has nothing to offer in the way of improvement.

Your engine has a compression ratio of 8:1; any compression values of 100 psi or above would be good but equally important is that they are all within 10% or so of each other. Don't forget to prop the carburetor throttle and choke valves open before taking the test, and crank about 3 strokes or until the gauge ceases to rise further. You might want to consider doing it first with the cylinders dry, and again after a squirt or two of motor oil in each cylinder - if you have low values that will help you differentiate between ring and valve issues.