Question about draining filter

[johnd]

I've been reading some back posts about installations and I notice a common thread is to set up the bypass filter so that it drains on shutdown so that it isn't a mess when you open it; however, let's look at the full senario. I have a dry filter and I check the engine oil with the engine not running. Once the filter fills up, the engine oil sump would be low to the amount that it takes to fill the filter. This could be verified by immediately checking the oil after the engine is cut off. With a 12 quart sump in a big truck, no big deal, but with an engine that only holds 4 quarts of oil in the first place.....it looks to me like you would be driving around with the sump 25% low. Sure, you could put in an extra quart (or whatever the filter holds) but then you risk have the crank hit the oil and foam on startup. Comments?

 

[olympic]

I'd go with the extra quart anyways. It would only be in the crank case for a few seconds after startup, until the bypass filter filled with oil again.

 

[RalphPWood]

With the compressing type TP filters most of the oil is in the element and stays in the element. Not more than a tea cup will drain at shut down. If the oil is at the full mark before you start the engine it won't get down to the 1/2 quart low mark when you start the engine.
I have used the filters on very small engines such as lawn mowers, very small generators, etc. I try to always buy equipment with a pressure oil system. I have installed the filters on Honda motor cycles. There was a motor cycle gang in California that had Frantz oil cleaners on all their cycles.
The Frantz and Motor Guards were the dominant TP filters in the 60s. It seems to be that way again.

Ralph