Barney, I realize that this relief valve is internal to the filter. My
question was that if the system oil pressure is more or less constantly over
20 lbs. (hopefully way over), and this oil filter relief valve is rated at
11 or 15 lbs., wouldn't it be open all the time? What's the point?
on 5/9/02 1:28 PM, Barney Gaylord at barneymg@ntsource.com wrote:
> At 12:40 PM 5/9/02 -0700, Max Heim wrote:
>> OK, now I'm curious. If the oil pressure (according to the gauge) is
>> running 40 to 60 lbs. (on average), why is this relief valve set so low?
>> Is the pressure at the filter that much less than at the oil pump?
>>
>> on 5/9/02 10:52 AM, Martin Libhart at mlibhart@kscable.com wrote:
>>> .... the L14670 has a by-pass pressure relief valve of 12 to 15
>> psi. The L10017 has a by-pass pressure relief valve setting of 8-11 psi.
>
> This is a relief valve internal to the filter unit itself. This will open
> and pass oil around the filter in case the filter element should ever get
> clogged up and become restrictive. I do hope that none of us on this list
> will ever neglect changing the oil and filter in our MG for long enough to
> cause such a condition.
>
> For some racing applications where an engine runs at very high speed, and
> it is fitted with a high volume oil pump, and the crankshaft bearings are
> intentionally fitted with larger than standard clearances with the
> intention of passing more oil to aid in cooling, then it is possible for
> the oil flow to exceed the flow capacity of the filter. In this case the
> internal relief valve serves as a partial bypass, and the filter reverts to
> a partial filtration system (which is better than collapsing the filter
> element from excess pressure differential). To retain full filtration in
> such cases multiple filters are sometimes mounted for parallel flow.
>
> Barney Gaylord
> 1958 MGA with an attitude
> http://www.ntsource.com/~barneymg
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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