[Fot] Fw: Help with Oil Pressure Problem

[Greg And Alison Blake]

While on the subject of oil pressure. At the end of a race as I come into the
paddock between 2000-3000 rpm when I close the accusump valve, the oil
pressure Gauge bounces around rapidly between 70-90 psi.

Any clue what that might be?

> On Mar 8, 2014, at 1:49 PM, John Wagner <j.wags63 at yahoo.com> wrote:
>
> make sure the plugs on the ends of the rocker shaft are tight or have
popped
> out.  As Tony would  say Don't ask me why I know that.
>
>
>
> On Saturday, March
> 8, 2014 11:20 AM, Larry Young <cartravel at pobox.com> wrote:
>
> I agree it would
> probably not be excessive rocker clearance as Greg
> explained.  However, no
> one has mentioned excessive cam bearing
> clearance. Not long ago we discussed
> this same problem with 6 cylinder
> motors. My TR250 has the same symptoms and
> I have wondered if cam
> bearings would solve the problem.
>
>
> On 3/6/2014 8:32
> PM, Greg Solow wrote:
>> I do not believe that the rocker assembly could cause
> this.  The
>> standard oil feed is though a restricted hole from the rear main
>> bearing to the rear cam bearing, then the feed is intermitently pulsed
>> by
> the rotation of the camshaft lining up a spiral groove in the rear
>> cam
> journal and some flats machined into the journal. I have by passed
>> this
> system and fed oil directly from the restricted drilling from the
>> rear
> main, to the drilling that goes up to the head. Doing this feed a
>> lot more
> oil the the rocker gear, but did not affect oil pressure at all.
> Excessive clearance in the oil pump, either excessive end float on
>> the
> gears or excessive tip clearance between the rotors will give low
>> oil
> pressure at idle, The oil leaks back withing the pump at it
>> rotates slowly,
> but at the reves come up and the pump turns faster, I
>> think it can overcome
> this internal leakage and the pressure in the
>> engine will come up.
>                Greg Solow
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