You may be right Rich, but according to a 1966 Ford shop manual the 260/289
does indeed have a relief IN THE FILTER element which "If the pressure
between the valve faces is great enough...the valve will open. Oil then
bypasses the element, maintaining an emergency supply of oil to the engine",
that is a quote from the manual. There is also a relief in the pump, the
discharge from this relief is routed back to the pump intake.
In any case, higher restrictions in the filter is not the best of ideas. If
it works how rich suggested (which it very well may for some makes) it is
not only a bad idea but could potentially be a catastrophy!!
> The filter itself does not contain a bypass, although most contain anti
>siphoning valve (rubber disk on the inside that lays against the ring of
>holes on the bottom of the filter). The actual bypass valve is in the
>oil pump or in the block where the filter is attached.
> Your assesment of the operation of the bypass valve is correct! A
>smaller filter WILL be more restrictive to the flow at higher rates, and
>thus the preasure will be higher at the filter base. When this preasure
>begins to exceed the preasure of the relief spring, the bypass valve
>will open. Depending on the engine, the oil going through the bypass
>valve will still be pumped through the engine. On others, it will be
>dumped back into the pan.
> I believe the Alpine 1592 engine dumps back into the pan, because when
>I had a plugged filter along time ago, my oil preasue gauge would bounce
>between 5 and 15 lbs at idle when warm, and wouldn't go above 20...Ever.
> When I changed the filter and the oil (same weight and brand) the
>presure at idle was 20, and would climb to as high as 50, with no
>bounce. The bounce was caused from the oscilating of the bypass valve
>at idle.
>
>Rich
>
>
>
>
>>----------
>>From: marrone@wco.com[SMTP:marrone@wco.com]
>>Sent: Wednesday, October 23, 1996 10:26 PM
>>To: Rick Fedorchak; tigers@autox.team.net
>>Subject: Re: Renault Spin on Filter
>>
>>What I have heard is the smaller the filter the "sooner" the bypass becomes
>>activated. Even largish (PH8A) filters have their bypass open at higher RPM
>>(and viscocity) but smaller filters bypass sooner and you end up spending
>>more time without the filter in the circuit.
>>
>>
>>>
>>> I've seen one of these critters installed on the Ford
>>>motor........and it's pretty tiny. Makes me wonder what the intended
>>>filtering capacity is versus what the Ford motor needs.
>>>
>>>Can anyone provide any feedback on how these small filters worked on their
>>>cars. Any problems encountered by using them ??
>>>
>>>
>>>
>>Frank Marrone MK I Tiger B9471116
>>marrone@wco.com 1966 LTD
>> Series I Alpine (2.3L powered by Ford)
>> Yamaha Seca 900
>>
>>
>
>
Frank Marrone MK I Tiger B9471116
marrone@wco.com 1966 LTD
Series I Alpine (2.3L powered by Ford)
Yamaha Seca 900
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