[Fot] Fw: Help with Oil Pressure Problem

[Duncan Charlton]

The bypass valve opening and closing?
Duncan

Sent from my iPhone

> On Mar 8, 2014, at 3:34 PM, Greg And Alison Blake <ablake2 at austin.rr.com>
wrote:
>
> 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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