[Spridgets] Optimum 1275 Engine Temperature

Ron Soave soavero at yahoo.com
Wed Jun 14 18:06:41 MDT 2017


The power figure needs to be corrected horsepower.  Brake specific fuel consumption around .45 is a happy tuning place for my engine.

Ron Soave

> On Jun 14, 2017, at 2:56 PM, WeslakeMonza1330--- via Spridgets <spridgets at autox.team.net> wrote:
> 
> Interesting.
>  
> Main bearing wear is greatest on start up as no hydrodynamic oil film has been established, and to a lesser extend on the other rod bearings.  I'm not sure about piston ring and bore wear but guess that's were the 90% wear takes place until the engine is warmed up because everything is tighter?
>  
> At race mechanics school they might teach that 90% of ring and bore wear occurs when driving through a gravel trap or someone else's gravel trap excursion generated dust without an air filter.  Or maybe they don't teach that!
>  
> Other info that I need, is to convert F to C so:
>  
> 190F = 88C Oil temp
>  
> 175-205F = 79-96C Coolant temp -
>  
> The thing with temp readings is that they vary with where you take them from.  The water (actually water + antifreeze) temp in the Pierce head on my car is way hotter than the water temp reading I see in the rad.
>  
> The other thing is how much the power figure varies with air temp - I'm guessing the richer the mixture (up to full race strength's) the less the power drop is with warmer air.  I'd like an air temp sensor in the engine bay.
>  
> In a message dated 13/06/2017 21:14:19 GMT Daylight Time, billyzoom at billyzoom.com writes:
>> For power or for economy?
> 
> How about for longevity? In mechanic’s school, we were always taught that 90% of engine wear occurred during warmup, and that the thermostat was there to reduce warmup time. They also taught us that running hotter wasn’t a problem as long as the coolant didn’t boil. Were our textbooks incorrect?
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