Quote:
Originally Posted by alexiskai
The argument against the air filter isn't purely originality, it's that putting a constriction on the carb intake changes the effective atmospheric pressure inside the carb and alters its function. Other elements of the engine bay design, such as the rearward-facing intake, help compensate for the lack of a filter.
The way Ford compensated for the lack of an oil filter was to use non-detergent oil, change the oil every 500 miles, and include sludge removal on the maintenance list. Airborne contaminants would become entrained in the oil and gradually sink to the bottom of the sump.
But if you're using detergent oil, which most people are, you're already pushing that system away from how it was designed, because the detergents will hold contaminants in suspension, sending them through the engine over and over. The use of an oil filter returns this system to balance and improves its efficacy over the original design.
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i think we all know that stuff.
i would argue that air cleaners and oil filters were being added to manufactured vehicles and equipment at the same time frame as the model A was being built. manufactures knew that contaminants in the air as well as the oil would harm the engine so they started making filters as part of the vehicle's standard components.. and there were no detergent oils when all this started.
Ford was thrifty and stubborn i imagine he saved millions of dollars not putting air cleaners on.