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10-22-2018, 08:43 AM | #21 | |
Senior Member
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,808
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Re: Like picking at a scab: let's discuss 'oil'
Quote:
More importantly, you can use a very strong valve spring and know that the roller lifter can handle the load. The strong spring allows the engine to run at higher RPM and still have the valves close properly (not "float"). Here's an example (not for a Model A): https://www.crower.com/media/catalog...292-16_1_7.jpg TBN is "Total Base Number". Generally speaking, the higher an oil's total base number, the better its ability to neutralize contaminants such as combustion by-products and acidic materials in the oil that would attack metals in the engine, like the babbitt. Without a PCV system, the Model a has a lot of contaminants in the oil. .
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
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10-22-2018, 11:02 AM | #22 |
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Join Date: Nov 2017
Location: Arvada, CO
Posts: 28
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Re: Like picking at a scab: let's discuss 'oil'
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