Quote:
Originally Posted by charlie66
Do you do this because you're trying to keep material out of the needles or is there more to it?
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It helps to keep from collapsing a plunger on HR cams. On pressure fed lifters it keeps foreign material out of the needles.
On a flat tappet I don’t care as much. My Grandpa’s 61 Biscayne had a 235 that didn’t even have a provision on the block for an oil filter, the suction screen was all it had. Lol
Those old external bypass’s are usually 3 to 5 lbs to bypass them, and the oil still has to get to the filter. If the spring is 50 or 60 years old who knows what is it yet. Lots of oil goes thru that bypass even a cruising speeds with them. OEM’s got rid of that design for good reasons.