[Healeys] start up Temp

[Roger Grace]

You sure to get lots of opinions and advice on this one ... !
Here is my take:
The concern with cold running, particularly if the engine has cooled overnight is the oil temperature; no matter what engine oil you use its lubrication properties are degraded when running below operating temps; think trying to circulate treacle. In the 60’s there was always the concern of breaking rings if the engine was revved too soon when cold; I don’t think that our AH have this problem.
The water temp is not the perfect indicator of oil temp but it is all we have; water temp can be very different to oil temp particularly when starting from cold. 
So in my opinion it is best is to “gently” start driving as soon as it is running stably and not likely to stall on you. Gentle means no revving through the gears and particularly no labouring in the wrong gear (sleeve bearings); the engine will warm up quicker when driving rather than sitting idling as the losses are higher when it is doing some work.
Also, I have always tried to shut off the choke as soon as possible, as running with too rich a mixture has the possibility of diluting the cylinder wall lubrication when you most need it.
rg

  
From: i erbs 
Sent: Wednesday, February 10, 2016 8:11 AM
To: Ahealey help 
Subject: [Healeys] start up Temp

So it has been many years since I have had a working choke in my car. 
I know I need to have oil pressure before I head out on a cold morning, but what temp should I wait for before driving off? I have just held the jokes up by hand until the car reached 190 degrees and ran without the choke. 
It has been in the 30s in the morning, but is is warming up. Today was 42. So at what temp is OK to start driving the car? It has been over 7 years since I have had the car on the road and I drove it sparingly then.  I now try to drive it as much as possible.

Ira Erbs 
Portland,OR
1959 BN4 100-6
with BT7 engine and disk brakes.


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