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Discussion Topic:
1935 flathead V8
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carcrazy |
04-29-2020 @ 4:59 PM
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Senior
Posts: 1651
Joined: Oct 2009
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The zinc additives that reduce the wear of the sliding surfaces of the camshaft lobes and valve tappets have been greatly reduced or totally eliminated from most of the Diesel motor oils currently available. If you want to provide the protection required for flat tappet equipped engines, one thing you can do is make use of an oil additive. Since I bought my '53 Ford Flathead powered car five years ago I have been using the following oil/additive combination to good effect: Pennzoil SAE 30 Detergent Motor Oil with Red Line Engine Oil Break-In Additive. This additive contains the correct amounts of zinc and phosphorus to reduce valvetrain wear. I have driven this car over 15,000 miles with no ill effects. The car is a driver which gets its oil changed every 2,000 miles. I use the original partial flow oil filter system on this car.
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TomO |
04-30-2020 @ 8:24 AM
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Senior
Posts: 7250
Joined: Oct 2009
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The Ford flatheads do not have strong valve springs and do NOT need any anti-wear additives to a good grade of motor oil. Your choice of Castol 10w-30 is a good one, don't contaminate it with additives that just empty your pocket book. Straight weight oil is made for lawnmowers not car engines. The multi-viscosity oils give better lubrication as the viscosity remains nearly constant from cold to normal operating range. The answer to your question about the normal oil pressure depend on which oil pump is installed in your engine. I will assume that it id the 50# pump and the normal range would be from 15# at idle to 30# at 40mph. The exact numbers do not mean much, as some engines will read lower and still run forever. Just check your oil regularly and add oil when it gets low. Also listen to your engine, if it sounds noisy, the oil may be thinning out from fuel leakage, so it is time to change it.
Tom
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carcrazy |
04-30-2020 @ 11:22 AM
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Senior
Posts: 1651
Joined: Oct 2009
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The reason for using the straight 30 weight motor oil is that the thinner weight and multi-grade oils find more paths to leak out of the engine. The reason for using the additive is to reduce the wear between the cam lobe and the push rod of the double acting, vacuum booster, combination fuel pump.
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TomO |
05-01-2020 @ 11:30 AM
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Senior
Posts: 7250
Joined: Oct 2009
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10W-30 oil has the same viscosity as 30W oil when the engine is at operating temperatures. Modern oils have many different chemicals in them to improve performance and wear protection. Using an additive can change the properties for the worse. I am not a chemical engineer, so I don't want to make my own witches brew for the oil pan. I started using Mobile 1 synthetic oil in my Lincoln to take advantage of the better lubricating qualities of the synthetic oil. After 200 miles the engine was running smoother and quieter. It also seems to have more pep. I intend to start using it in my Merc to see if it has the same effect on the flathead.
Tom
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