Re: Oil Filters

Posted by Jim On 2012/2/29 5:00:51

Quote:


Yea, the early 356's had full flow filtration to the lifters to ensure a clean supply of oil under ideal circumstances. I think I've posted this info. in my blog, and else where on the site. Did a comprehensive paper on it and presented at the meet in November, and sent to Jim Hollingsworth and other interested parties who requested same.

Bottom line, the filters for the early cars that run full flow filtration to the lifters need an internal filter by-pass, that is located in the top of stand pipe that runs up the middle of the canister. Filtered oil comes up the middle, and squirts out of a hole on the side at the top of the tube (that's how the swarf can settle to the bottom and not drain back). If the element becomes clogged, there is a spring and ball pop-off (by-pass) valve that allows the oil to shoot between the lid and top of the filter element effectively bypassing the element. Under either operating conditions the oil exits the port on the side of the filter canister. Somewhere, I also posted an alternative larger element that I run.

I'm running the '40 in full flow mode with no issues, but also went with the factory directed oil pump upgrade, so I dunno... it worked fine before so what can I say. Bottom line, you gotta have the filter specifically marked HT on the top of the lid, with the integrated by-pass to even end up with a choice in the matter, otherwise, you are relegated to pluming in bypass mode. If your crankcase is not currently drilled for the drain-back, you will have to follow the bulletin and drill / pipe tap a drain back hole into the pan rail area. I'm almost sure I posted most of this here a while back, but more than a week has gone by, so it's dissipated from my sieve of a memory.

Best of luck on your filter project!