[Roadsters] Dropping Oil Pressure at idle

[Hoon Kim]

I guess the real problem is that my engine starts to stall now with the
pressure dropping. I'm not as concerned about it dropping but what the
engine is doing when it drops. This was not a problem before the alternator
swap.

I think it may have to do with the GM swap and the alternator not kicking in
at idle. I'll have to test it out.

On Wed, Jul 28, 2010 at 12:01 AM, Gary and Cindy Ault <aultgc at att.net>wrote:

> Hoon,
>
> This is a typical response of many early electrical oil pressure gauges.
>  My '66 1600/'69 U20 oil pressure dros to near zero at idle, and has for as
> long as I have had the motor in the car.  As soon as I "blip" the throttle,
> the pressure comes back.
>
> Gary
> ----- Original Message ----- From: "Hoon Kim" <hoonhkim at gmail.com>
>
> To: "Roadster mailist" <datsun-roadsters at autox.team.net>
> Sent: Tuesday, July 27, 2010 3:08 PM
>
> Subject: [Roadsters] Dropping Oil Pressure at idle
>
>
>  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
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