[Healeys] Fwd: OIL

[sebring at illawarra.hotkey.net.au]

First engineering question is, what is it and how do you wish to use it? What 
condition is it in?

Modern highly finished, narrow tolerences in manufacturing, engines have 
different lubrication requirements to older, heavier and less accurately 
manufactured engines.

Oil still remains the basic ingredient that keeps the moving parts seperated, 
cooled and washes away the fuel and incomplete combustion residues. Also it 
removes the metal bits from bearings, rings and other friction surfaces.

Newly machined and assembled engine components have a much different 
lubrication requirement to 'run in ' motors and different again to worn engines 
with excessive clearances.

Running in involves grinding or wearing in of all the 'rough' surfaces of new 
mating components. Old days practice was a bedding or running in period with 
one oil and then convert to normal operation temperature, revs and load 
situation. Engineering finishes are specified as certain textures or roughness 
and although they may look smooth they are in fact best described as less rough.
Racing guys use linishing as bearing surface finishes but textured surfaces for 
cylinder walls and cast ring faces

My advice read the PENRITE OILS webpage as it specifically requests you to 
nominate you type of Healey before recommending their oil. The design their 
oils for our style of car
Joe

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