Originally Posted By: RalphPWood
On a 12 valve Cummins at work I drilled the adapter 7/32". I took the center piece of a universal Perma-Cool adapter to a machine shop and had them make a center piece with Cummins threads. The pressure came right up. The full flow filter heated up first then the Motor Guard started heating up. I drilled a sandwich adapter 1/4" on my Subaru Legacy. It worked by it took a long time to heat up. In cold weather all of the oil would have gone to the full flow filter. It is very rare that the adapter would need to be drilled but 7/32" is not going to be too large. On my lawn mower I don't drill the adapters. The small engines don't need a drilled adapter. The Subaru doesn't need to be drilled. I plugged the hole. You can get a huge amount of oil thru the relief valve.
Several years ago I put a filter on a 20 HP Kohleer. The engine had no pressure gauge. All I had was a 2 port Frantz adapter. From one port I ran a line to the oil filter. I returned the oil to the drain plug in the bottom of the engine. I used the other port for an oil pressure gauge. On another Kohler I installed a Perma-Cool 181 Ford adapter. I hooked up both oil lines to the Motor Guard. The adapter will take the stock full flow filter or a less expensive little Toyota, etc. filter.
As you guys know the Motor Guard is my favorite design. I put a Frantz and a Frantz 1750 adapter on a Toyota Corolla about 20 years ago. When it was sold several years ago it had over 500 Thousand miles on it. The Motor Guard has the best design for servicing but the element is the important thing.
In this business you are going to get complaints. I got a call from an old customer that was getting a low reading on his gauge on a marine diesel engine. It was hooked up in the conventional way, with a tee at the oil pressure gauge. The problem was the filter was robbing oil off the gauge. The solution was to install a Perma-Cool adapter. The Frantz adapter would have also solved the problem by pulling the oil off the main oil supply. A guy in California ordered two M-30s for his Chevy diesel suburban. He used the universal adapter. He also ordered a Motor Guard for his transmission. He seemed to know what he wanted with no help from me. Then I started getting orders for Motor Guards for marine engines to be used with the Perma-Cool adapters. It turned out he was a marine diesel mechanic that was telling people about the filters.
Ralph
I know this is an old thread but it does warrant a response.
I installed a sandwich adapter on my 2.5 Subaru along with a Frantz oil filter. All went well for 2 years until I lost ALL the bearings in the engine. Upon disassembly I found 4 of the 5 screws on the back of the oil pump loose. The sandwich adapter restricts oil flow and if there are any internal leaks, oil will be lost with a resulting loss of oil pressure. On cars with an oil pressure gauge, the driver would notice the loss of pressure but with an idiot light, you'll never know until it's too late.
BTW, the loose screws on oil pumps are a very common problem with Subaru 2.5 engines. I just wish I'd known about it before this happened.