Tom Windsor

I have taken engines apart where the pipe was missing and there did not seem to be any problems related to the tube being gone. There is so much oil splashing around from being thrown off the crankshaft that, in comparison, the amount from the oil filter is negligible.

Tom Windsor

The H isn't a full flow oil system? Guess I learn something new everyday!

The full flow oil system dumps all the trash into the bearigs if you blow out the filter. On a bypass system if the filter plugs up there is no harm done.

These engines were made for reliability and a bypass system works quite well, look at how many old abused H's and M's are still operating well. When is the last time you pulled the drain plug from a car engine and had to poke a hole in the sludge to get the oil to drain, yet the engine will still run well? I've done that on lots of old Farmalls which must have gone years since the last oil change. Big bearings and slow speeds and an oil bath air filter.