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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

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Old Oct 30, 2020 | 01:59 AM
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Originally Posted by ALBUQ F-1
Model A engines had 4.2:1 compression ratios
Correct. Very low by today's standards. But if there were not an unloader valve or pressure switch it would keep pumping until the weakest link broke or the engine stalled, which means that the output pressure would have to be equal to, or greater than, the Δp cylinder pressures created during the compression and power cycles.
 
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