[Roadsters] Dropping Oil Pressure at idle

[RWM]

All that, plus the gauges are known to be highly non-linear on the low 
end of the range.



Eddie wrote:
> Oil pressure ALWAYS drops at idle in almost any vehicle.  That's 
> normal.  The motor is spinnning at slower RPMS, and so the pump is 
> spinning slower, and thus the pressure drops.  I've never owned a 
> single car that didn't have SOME drop between idle and driving speeds.
>
> If it drops REALLY low, then you've got a potential problem.
> Eddie
>
> Hoon Kim wrote:
>> Just when things are starting to come together, something else shows up.
>> Such is the nature of our cars.
>>
>> After successfully (I hope), swapping out for a new larger 
>> alternator, I've
>> noticed that my oil pressure is now dropping when I'm at idle. This is
>> happening after the engine is warm. When I rev the engine or when I'm
>> travelling, the pressure returns to normal. I'm pretty sure it is not 
>> my oil
>> gauge since I let it drop until the engine stalled on me. I didn't 
>> notice
>> any knocking, just as the oil pressure drops, the engine gets 
>> rougher. I did
>> also recently replace the oil filter, but haven't changed the oil. 
>> Any ideas
>> on what it could be?
>>
>> Is my engine wearing down (I hope not)?
>> Do I need a new oil pressure sending unit?
>> Do I need a new oil pump?
>> Do I need to add more oil or a heavier weight (don't think so)?
>>
>> Thanks all.
>>
>> Hoon
>> Early '67 1600