On 23 May 1997, Justin Wagner wrote:
> If the spin on filter has a relief valve built into it... wouldn't it
> make sense to put a extremely strong spring into the TR's original
> bypass... so as effectively TURN OFF the old relief system...
The two bypasses have two quite different objectives.
The original bypass is in fact an oil pressure limiter/regulator that
returns oil to the sump when the oil pressure would otherwise be too high,
i.e. when the oil is cold or you are running at high RPM. Increasing the
spring rate here would increase the oil pressure beyond what is required,
serving no purpose other than wasting fuel and horsepower, as well as
accelerating cam chain and oil pump wear.
Any bypass built into an oil filter opens up when the pressure
differential over the filter gets too high, i.e. when the filter is
clogged due to over-long mileages between changes. It is based on the idea
that dirty oil is better than no oil. For cars that only receive
maintenance when they actually stop, this is probably a very good choice.
Egil
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