On 16 Mar 1998, Allen Nugent wrote:
> >The
> >hole is aproximately 1/16" in dia. now, and I was thinking of enlarging
> >it to 3/32".
> >Would this help to get a liitle more oil to the rockers
> >without adding an external oil feed kit?
No. It would probably only give more oil to the rear rockers and less to
the front ones. Not a very good idea, IMHO.
On the TR6 the oil supply to the rocker shaft is metered in
proportion to RPM.
> I'd be worried that such a mod might lower your oil pressure.
No. See above.
The modification will only lower the oil pressure in the rocker shaft.
Not that there would be any oil pressure to speak of in the shaft - the
shaft and rockers would have to be an exceptionally good fit for any
pressure to build up all.
> Maybe it
> wouldn't be by much, but I'd be inclined to uprate the relief spring in your
> oil pump (in the TR7, this takes you from 60 PSI to 80 PSI), at the same
> time. In fact, the oil pressure upgrade alone should improve lubrication of
> the rockers.
No, it does not.
The oil supply to the rockers is metered *by volume*. Added pressure
would not increase that significantly. It *would* burden the oil pump
more, and supply more oil to the crankshaft.
Egil
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