[DaimLan] Oil Galley

You drill a pilot hole as far down in each oil galley V as you dare. Then
make it as big as you care to. I chose 3/8.

The oil now drains back to the pan in an hour or less. It comes up almost a
quart. Which begs the question, should I overfill the engine to have enough
oil in the pan or just run one quart low all the time. because the first
quart in the oil galley essentially stays there while the engine is running.
Although when it is hot it should run like water through the holes.

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Hi,

Does this mean the camshaft is starved of oil at start up?

Any idea how long it takes the oil pump to fill the ‘V’ ?

Roger.On Wednesday, August 6, 2003, at 04:46 pm, Payton Fireman wrote:

You drill a pilot hole as far down in each oil galley V as you dare.
Then
make it as big as you care to. I chose 3/8.

The oil now drains back to the pan in an hour or less. It comes up
almost a
quart. Which begs the question, should I overfill the engine to have
enough
oil in the pan or just run one quart low all the time. because the
first
quart in the oil galley essentially stays there while the engine is
running.
Although when it is hot it should run like water through the holes.

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In reply to a message from Payton Fireman sent Wed 6 Aug 2003:

Thanks for your explanation of what you have done. I have a
concern similar to that expressed by Roger, who wondered
about the cam now starting up relatively dry.

Your mention of 3/8’’ diameter holes surprises me a bit.
Seems to me the engine requirement is that when running, the
bottom of the cam is bathed in oil which is sitting in the
valley. Although you have now provided a drain arrangement
so that oil will drain when the engine stops, the drain
capability must be less than the supply capability to ensure
that the oil builds up quickly in the valley to the
predetermined level. The original drain arrangement was,
unless I am mistaken, a single hole at the rear which might
be as large as 3/8’’ (I haven’t measured it), but was
presumably sufficient to keep the excess oil drained when
the engine is running. You have now provided several 3/8’’
holes at a much lower level, and I would be concerned that
the oil never rises to the level of the cam, thus risking
some degree of lubrication of the cam surfaces.

Is there any other way in which the cam faces are
lubricated, thus obviating the need to keep the oil level
high? I am somewhat reassured by your comment that you have
had 12,000 trouble-free miles, but would be more reassured
had you opened the cam up for inspection again and found no
problems with the faces.

Please don’t read this as a criticism of your technique…I
am merely thinking aloud as I follow this through, and would
appreciate any further comments you might have, particularly
on my logic.

John Slade–
John Slade
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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The camshaft runs in its own oil galley. It is the cupped canoe like oil
holder that is the structure for the cam bearings and webbing and runs down
the center of the block above the V’s.

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Hi,

Only the SP250 has this, the saloons do not.

Roger.On Thursday, August 7, 2003, at 05:38 pm, Payton Fireman wrote:

The camshaft runs in its own oil galley. It is the cupped canoe like
oil
holder that is the structure for the cam bearings and webbing and runs
down
the center of the block above the V’s.

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It should be pointed out that only the SP250 motor has the channel cast in
below the camshaft and this remains full of oil to keep the camshaft
lubricated at all times.
Saloon motors have this channel deleted and rely on the vee being full of
oil for lubrication. Therefore, drilling holes in a saloon motor would not
be advisable.
However, one can buy a cheap pump that is supposed to drain oil through the
dip stick tube. I wonder if one could insert it down the oil filler pipe
and extract the valley oil that way at oil change time?
Keith Humphreys

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