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Re: Oil Pressure (Filter Study)

To: mgs@Autox.Team.Net
Subject: Re: Oil Pressure (Filter Study)
From: mmcewen@gpu.srv.ualberta.ca (John McEwen)
Date: Tue, 27 May 1997 14:54:01 -0500
Hi Bob:

Ahh, the drainback valve must hold back the oil so it doesn't get too warm
and lose its viscosity.  Right?  :- :-

John

Remember the thermostat thread.





>So the drainback valve ain't too high tech in a Fram filter. If the oil
>filter hangs down, it don't matter. The oil ain't gonna *drain up* when
>you shut off the motor.
>
>And what would the drainback valve have to do with causing a *decrease*
>in oil pressure.
>
>Sorry to be so obtuse. The C/GT uses that cursed, upright, felt element.
>If there is supposed to be drainback valve in there I haven't found one.
>Everytime it fires off I have to grit my teeth through the death rattle
>waiting for  oil to fill that damn canister back up. This is the same as
>the B's that use that cartridge element.
>
>The TR6 has an 'improved' accessory that implements a screw-on oil
>filter. But it is so small you couldn't fit a tennis ball inside _and_
>it is still a real pain to remove.
>
>So, again, what is the theory that an oil filter would cause the
>indicated oil pressure to drop? And why is that a bad thing? I would
>think you would get excited if an oil filter caused oil pressure to
>*increase*!
>
>If you replace the oil filter with a metal plate with a pin-hole in it,
>oil pressure would really go up. Would that then, by defiition, be the
>perfect filter?
>
>Obstinately puzzled,
>
>Bob Allen, Kansas City, '69CGT, '75TR6
>
>Paul D Kile wrote:
>>
>> After having two separate oil pressure lags using Fram filters, he
>> slit open both filters and found the anti-drainback valves had failed
>> in both.  These valves are simply a thin flexible membrane that
>> covers the filter inlet holes from the back side when there is no oil
>> pressure.  In both filters, the membranes had developed a warp or
>> "fish mouth" around the edge that allowed oil to drain out of the
>> filter.
>>
>> Moral:  All oil filters AREN'T created equal!
>>
>> Cheers, PK
>>
>> Paul D. Kile



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