I sent a request to Fram about the flow rates of the PH8A, TG8A, XG8A, and HP1 filters. I was curious how the new staff there might respond. Here is the response I received from them.
Per our engineering team all filters are tested at ISO 4548-12 test standards. The test is performed with MIL-H-5606 oil at 40 C temperature. The filters are only tested at 3GPM per test requirements. Here are the restriction results for each model:
PH8A: 1.8 PSI @ 3GPM
TG8A: 1.8 PSI @ 3GPM
XG8A: 1.5 PSI @ 3GPM
HP1: 1.45 PSI @ 3GPM
A search for MIL-H-5606 technical properties showed a KV40 of 13.8 cSt.
Per our engineering team all filters are tested at ISO 4548-12 test standards. The test is performed with MIL-H-5606 oil at 40 C temperature. The filters are only tested at 3GPM per test requirements. Here are the restriction results for each model:
PH8A: 1.8 PSI @ 3GPM
TG8A: 1.8 PSI @ 3GPM
XG8A: 1.5 PSI @ 3GPM
HP1: 1.45 PSI @ 3GPM
A search for MIL-H-5606 technical properties showed a KV40 of 13.8 cSt.