I got a T-1 (Beetle style) engine in my '69 VW microbus, but have an aftermarket remote oil filter on it. I usually use the same size filter as the T-4 (later model) engines call for as long as they have a bypass valve in the filter itself. The T-4 engines should already have a bypass in the filter mount...as far as I know they all did, anyway. My aftermarket set-up does not, of course, so I use a filter that, for sure, has a bypass valve in it so that cold, thick oil, or when there is lots of oil flow at high RPM, can temporarily go around the filter paper when it has to and get to the engine.
This is particularly important on an ACVW, as the oil pressure is regulated (more or less) by the spring piston at the end of the main oil gallery after the filter, instead of before, as on most machines. That is, of you have the second regulator at all like mine does...(1970 an on design?)
Anyway, so if the filter doesn't have a bypass in it, or a not-good-one, and the oil is too thick to go through the paper well enough, pressure downstream will be OK, but could be anything between the filter canister and the paper element.
That's what has happened to me...twice.
I have 20W-50 in the crankcase, and it's cold so I noticed the AC/Delco PF13CL was bulging and I figured the [censored] "clicker" type bypass valve isn't that good. I changed it for a NAPA ProSelect 21521 a few days ago.
This morning I was in a hurry to get something at the parts store and took off without any warm-up and half a block away my oil light comes on. I shut her down and got out to see a [censored] of oil from the filter leading all the way back to my house. The NAPA blew was bulged and blew the O-ring too! The oil pressure on the gauge was not too high, but the 20W-50 was almost like honey at 18 degrees F. I walked home and grabbed a Fram and stuck it on there. (I had oil in the Bus, but not a spare filter.) I topped it up and was fine, so far.
Now I've done all this before with 20W-50 in the cold Bus and all, but never had a filter bulge or blow out ever, on anything, in 30 years if driving.
I need to put something thinner in there for now, and keep an eye in it, sure, but I do not like the bypass in the Delco or the new design bypass on the ProSelect. I suspect them. The ProSelect now has a cheapy rubber ring that is supposed to fold inward and relieve pressure to let it down to the engine and pop back out when conditions improve. Problem is, rubber stuff gets harder in the cold. The old metal spring valve was better. It always opened at about the same pressure regardless of temperature.
The Fram I put on (forgot the number), well I'm not a fan of most Frams, but at least it has a metal spring valve bypass.
Look at these fat boys--the one on the right blew the oil:
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This is particularly important on an ACVW, as the oil pressure is regulated (more or less) by the spring piston at the end of the main oil gallery after the filter, instead of before, as on most machines. That is, of you have the second regulator at all like mine does...(1970 an on design?)
Anyway, so if the filter doesn't have a bypass in it, or a not-good-one, and the oil is too thick to go through the paper well enough, pressure downstream will be OK, but could be anything between the filter canister and the paper element.
That's what has happened to me...twice.
I have 20W-50 in the crankcase, and it's cold so I noticed the AC/Delco PF13CL was bulging and I figured the [censored] "clicker" type bypass valve isn't that good. I changed it for a NAPA ProSelect 21521 a few days ago.
This morning I was in a hurry to get something at the parts store and took off without any warm-up and half a block away my oil light comes on. I shut her down and got out to see a [censored] of oil from the filter leading all the way back to my house. The NAPA blew was bulged and blew the O-ring too! The oil pressure on the gauge was not too high, but the 20W-50 was almost like honey at 18 degrees F. I walked home and grabbed a Fram and stuck it on there. (I had oil in the Bus, but not a spare filter.) I topped it up and was fine, so far.
Now I've done all this before with 20W-50 in the cold Bus and all, but never had a filter bulge or blow out ever, on anything, in 30 years if driving.
I need to put something thinner in there for now, and keep an eye in it, sure, but I do not like the bypass in the Delco or the new design bypass on the ProSelect. I suspect them. The ProSelect now has a cheapy rubber ring that is supposed to fold inward and relieve pressure to let it down to the engine and pop back out when conditions improve. Problem is, rubber stuff gets harder in the cold. The old metal spring valve was better. It always opened at about the same pressure regardless of temperature.
The Fram I put on (forgot the number), well I'm not a fan of most Frams, but at least it has a metal spring valve bypass.
Look at these fat boys--the one on the right blew the oil:
