how to do a compression test?
Posted: Thu Aug 17, 2017 1:32 am
Last fall, my saga to completely rebuild my motor started with deciding to do a compression test on my newly purchased '37. Sort of just curious, as it seemed to run fine to me. So had my wife crank the motor, and found 1-4 were a bit low, high 80's, but 5 and 6 were 70 and 40. Nine months and hundreds of hours and thousands of dollars later, my truck starts instantly, idles fine, and has great power, and smooth acceleration and cruise. It should after being static and rotationally balanced.
But reading since that it you need to hold the throttle plate open to get an accurate compression reading, which I did not do, how do you do so with a carb that does not directly connect the throttle pedal to the throttle plate, but rather operates via the governor, not something I fully understand. So, how do you actually hold the throttle blade open on these vintage systems?
NV
But reading since that it you need to hold the throttle plate open to get an accurate compression reading, which I did not do, how do you do so with a carb that does not directly connect the throttle pedal to the throttle plate, but rather operates via the governor, not something I fully understand. So, how do you actually hold the throttle blade open on these vintage systems?
NV