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t&t tech 
Platinum - Posts: 2,594
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Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: August 18, 2010 at 8:58 PM / IP Logged  
Ok guys totally random question. What's the average temperature an engine has to be at before cooling is desired?
lspker 
Silver - Posts: 503
Silver spacespace
Joined: November 23, 2003
Location: Canada
Posted: August 18, 2010 at 10:12 PM / IP Logged  

Ideally, it would never need cooling, making it more effient.

Way back in the old days, thermstats were to open around 160 f, the newer stuff around 105 c, mostly because the hotter running makes reducing pollution easier.

oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: August 19, 2010 at 2:31 AM / IP Logged  
Ditto...
Too cool damages the engine.
So too does too hot.
Older 1960s-1970s engines like mine are low pressure (radiators; eg, 7psi) with ~82°C thermostats.
But newer engines run coolant (hence hotter) and higher pressures, and higher thermostats.
It really depends on the engine etc.
awdeclipse 
Copper - Posts: 285
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Joined: August 05, 2007
Location: Michigan, United States
Posted: August 19, 2010 at 7:31 AM / IP Logged  
90-100c is "industry standard" regarding a target temperature.
Projects I have worked on will run upwards to 130c before things start shutting down. For instance, the AC will shut off around 135c and the engine will go into a form of limp-home at 140c
These numbers are referenced from some Gasoline port and direct injection projects I've worked on.
i am an idiot 
Platinum - Posts: 13,465
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 19, 2010 at 3:46 PM / IP Logged  
Temperatures above 100C are very dependent on pressure in the cooling system.  Darren we really need much more info about what you are asking to be able to answer this question.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: August 19, 2010 at 4:56 PM / IP Logged  
And whilst systems may not boil until over 130°C (~270°F), that doesn't mean the engine components & systems appreciate it....
t&t tech 
Platinum - Posts: 2,594
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: August 19, 2010 at 7:18 PM / IP Logged  

At mr idiot, i had no specifics in mind it was just a thought, so i thought i'd ask, thanks for the responses by the way fellas! Appreciate it!

howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 22, 2010 at 6:09 PM / IP Logged  
In the real world, I don't think modern engines will run for too long at the 130c temps, think of the rubbish gaskets that go on most production vehicles these days.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: August 22, 2010 at 6:28 PM / IP Logged  
Correct. But they can get that hot - hence why somethings will shut down to postpone destruction.
It assumes you are desperate to get home and hence ignore all the bells and whistles.
Unlike older vehicles with the ignored single "what's that O light?"...
I'd say 110C maybe 115C is the max any engine would run at. Of course, it depends where you take that measurement.... And I'm probably thinking more of competition vehicles.
Ceramic engines without "coolant" (and conventional gaskets) may run hotter....
awdeclipse 
Copper - Posts: 285
Copper spacespace
Joined: August 05, 2007
Location: Michigan, United States
Posted: August 22, 2010 at 9:14 PM / IP Logged  
Death valley and AZ on hot test we see upwards of 120c. But on the track you get coolant up to 130c along with the oil around 120c for quite some time.
And the guys that do hot fuel handling are looking at 130c coolant and 130c oil temps. But this is a forced condition highly unlikely to be encountered by a customer.
Do a search on GM camel mode if you haven't heard about this. Oldspark it is pretty much what you are talking about. Purpose is to get you home and pretty much scrap the engine in the process.
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