[Healeys] Oil Pressure

[Michael Salter]

Richard is,as usual, absolutely correct in that the lifters are very
slightly convex on the base however it is not that which makes them rotate
rather that the fact that the lifter bores are slightly displaced from the
centerline on the cam lobes.
In many Healey engines that I have disassembled however it is quite
apparent that at least some of the lifters have not been rotating as
evidenced by the rectangular shape of the witness mark on the base. By
measuring the position of the rectangle one can confirm that the
displacement is about 1mm as I recall.
I've never been able to determine why some lifters fail to rotate as they
seen quite free in the bore.
Regarding the idea that the engine has to be turning at 1500 RPM to throw
oil up to the cam I totally disagree with that.
Even 600 RPM is 10 rotations a second ....  hmmmm.

M

On Sun, May 10, 2020, 7:25 PM richard mayor, <boyracer466 at gmail.com> wrote:

> The lifter faces are not flat. They have a crown so they rotate in the
> bores as the cam lobes move across them. At low RPMs the lifters do not
> rotate so much.  It is absolutely essential on initial start up that the
> lifters are rotating so the cam and lifters can properly bed in. This is
> accomplished if the engine is reving at least 1500 RPM.
>
> On Sun, May 10, 2020 at 2:24 PM Michael MacLean <rrengineer.mike at att.net>
> wrote:
>
>> Why do I keep hearing on initial start up immediately get it up to approx
>> 2000 rpm and run it 20 minutes to bed in the lifters and cam.  Old wives
>> tale.  I have seen it done.
>> Mike MacLean
>>
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>>
>> On Sun, May 10, 2020 at 2:09 PM, Michael Salter
>> <michaelsalter at gmail.com> wrote:
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