So we come full circle on the original question as to which is the proper
replacement filter for the spin-off conversion kit for the MGA. Using
only Fram numbers for simplicity, we have the following candidates:
PH 3600
PH 43
PH 3614
I looked at all of these over the weekend, since I have this same problem
that I solved unscientifically by using the one that *looked* like the
one that came with the kit (which is the PH 3614). How do we know which
is right? The PH 43 says it is for MG's, but I'm sure that refers to MGB
applications. In the MGA the filter hangs "properly" so anti-drainback
wouldn't seem to be an issue. An internal pressure relief valve is
required? Why? Surely the cotton filter / canister stock setup has no
pressure relief valve. If it is required, how does one know the proper
pressure, then how do you know if your filter has it? I looked at the
boxes and found no specifications, beyond recommended applications.
As often happens, the more answers we get the more muddied the subject.
What is the definitive answer? Where did the recommendations come from
(Barney, I recall the PH 43 was yours)? Science, or (as in my case)
ignorance?
David Littlefield
Houston, TX
On Mon, 14 Apr 1997 11:57:09 -0400 (EDT) Chip Old
<fold@mail.bcpl.lib.md.us> writes:
>On Mon, 14 Apr 1997, Dave Houser wrote:
>
>> Regarding all the different types and numbers of replacement
>spin-offs
>> for Moss' conversion, I wonder shouldn't there be an internal
>pressure
>> relief valve inherent in the selection of filters used? Moss states
>> this fact as a requirement. Do all the filters mentioned that
>> apparently fit meet this criteria? If so, all is well, if not,
>beware!
>
>That is true. The fact that several filters from the same
>manufacturer
>have the same exterior size, thread size, and gasket diameter doesn't
>mean
>they are all suitable for the same application. Some will have
>anti-drainback valves, some will not. Some will have built-in filter
>bypass valves, some will not (and those that do may not all be set to
>allow bypass at the same pressure). Some filter smaller particles
>than
>others. And so on.
>
>-----------------------------------------------------------------------
>Chip Old 1948 M.G. TC TC6710 NEMGTR #2271
>Cub Hill, Maryland 1962 Triumph TR4 CT3154LO (daily
>driver)
>fold@mail.bcpl.lib.md.us
>
>If cars had evolved as fast as computers have, by now they'd cost a
>quarter, run for a year on a half-gallon of gas, and explode once a
>day.
>
>
>
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