Is this really a problem? It sounds about right for a BJ8. I think the oil
pressure at idle is specified at about 25-30 PSI. The BJ8 actually runs a
little lower than the earlier sixes. Did you change the pressure relief
plunger and spring?
Bill Lawrence
On 12/7/04 9:39 AM, "Paul Baker" <paulbaker51@yahoo.co.uk> wrote:
> After 3 years racing and 12,000 competitive miles (not all by me), I thought I
> would treat my BJ8 to an engine rebuild. Prior to the rebuild, the engine
> used a little oil and smoked a bit on overrun, but the oil pressure was 4 bar
> (60 psi) cold tickover and 2 bar (30 psi) when hot and on tickover. I have
> always used Castrol RS 10-60 (fully synthetic). During the rebuild the main
> and big end bearings were replaced although there was very little wear to the
> old set, the piston rings were changed, the oil pump was replaced for a new D.
> Welch h/c pump (due to excessive wear in the gears of the std BJ8 pump) and
> the cam, valve springs, seals and bucket followers were replaced (valve guides
> were fine). Overall the engine was in very good condition.
>
> I have since run in the engine using Castrol No 2 running-in oil for the first
> 300 miles and replaced it with a 10-40 mineral oil for the next 500 or as many
> miles as I can get on it before the next race season starts, when it will be
> replaced with Castrol RS 10-60.
>
> The problem is that the oil pressure since the rebuild and is now 3 bar (45
> psi) on cold tick over and 1.8 bar (26 psi) when hot. I can't see that this
> is going to improve greatly when I replace the 10-40 with the 10-60. My
> engine rebuilder is somewhat baffled by this outcome. We plan to check the
> oil pressure relief valve but this was not touched during the rebuild but what
> else could be causing this problem?
>
> As always, any suggestions greatly appreciated.
>
> Paul
>
> 66 BJ8 works rep
> 67 BJ8
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