Steve Sutton wrote:
> I believe it is not a 'bypass' valve, but actually a
> anti-drainback vavle. I say this because the vavle is in the 'output' of the
> filter (dirty oil flows from the outside of the filter, thru the filter
>element
> and the clean oil flows out the center opening in the oil filter) and only
> opens towards the top of the filter. This would prevent oil draining back to
> the sump from the oil galley via the filter. Id this correct?
Correct.
Without a drainback valve, the filter empties when the
engine is stopped. This means when the car is next started,
the oil filter has to fill before you get pressure again, much
like the way you don't get oil pressure after installing
a new filter for a second or two.
The argument is that this valve reduces engine wear
on startup by getting oil pressure sooner. Makes sense
to me, but like anything, the actual detriment of NOT
having it is up for discussion.
--
.---------------------------------------Ottawa-Canada-GOSENSGO-----.
/ Trevor Boicey 1992 Celica GT 1975 MG Midget /
`----- tboicey@brit.ca -------...so close, but so far, gosensgo--'
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