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Continuously running thermo fan?

Started by _Terrible One_ , Apr 21 2009 05:44 PM

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38 replies to this topic

#26 _Pallbag_

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Posted 07 May 2009 - 01:56 PM

What is the optimum temp for a holden V8 ? And what is too extreme/hot before things can go wrong ?

I know its a bit of a thread steel, but seems to be some knowledge here so why not ask ...

On the weekend I was in a parade and my torrie usually sits around 180*, bit warmer when stationary for any time, however during the parade it got up to 210*, coolled down as soon as I got out of the parade and took it for a short squirt up the road.

How hot is too hot ?

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#27 76lxhatch

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Posted 07 May 2009 - 04:44 PM

Too hot depends on the coolant and the pressure, you should be able to find some specs from your coolant that say when it will boil. As far as I know, some are good for up to around 120 C. As soon as it boils it no longer transfers heat effectively, that's when you're stuffed.

I agree with torbirdie's last post, Squarepants I didn't read your last post closely enough - I'm presuming the part that torbirdie quoted was a mis-type as you have it backwards?

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#28 _426_

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Posted 07 May 2009 - 05:17 PM

Come again? There is constant air flow through the radiator if the car is moving, do you mean to say that by using the wrong combination of idle and various road speeds one might cause engine temperature problems...?

No I'm not saying that at all.

What I am saying is there are optimum parameters for the engine to operate. Sure through driving we will, at times operate the engine outside the optimum parameters BUT running a thermo fans constantly will operate the engine outside the parameters near on incesently.

Be mindfull, while you are driving you will varues speed and therefore varie airflow, whereas a constant running thermo will not.

:spoton:

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#29 76lxhatch

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Posted 07 May 2009 - 07:03 PM

A constant running fun won't give as much air flow as driving at 100km/h for a period of time (which is normal use and common). The radiator isn't even in use when the water thermostat is closed, therefore it cannot have any effect, positive or negative.

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#30 _torbirdie_

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Posted 07 May 2009 - 09:14 PM

running a thermo fans constantly will operate the engine outside the parameters near on incesently.

best you tell everyone what optimum engine parameters you think :huh:

will be vilolated by the electric fan(and only by an electric fan) blowing air through the radiator, and when if ever an engine is run to such optimum parameters.

Edited by torbirdie, 07 May 2009 - 09:17 PM.

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#31 _426_

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Posted 07 May 2009 - 10:09 PM

A constant running fun won't give as much air flow as driving at 100km/h for a period of time (which is normal use and common). The radiator isn't even in use when the water thermostat is closed, therefore it cannot have any effect, positive or negative.

Periodic is NOT constantly.
As for normal use and common, in most cases it would be easily less than 20% in everyday use.

The radiators job is to cool its contents. Those contents will get cooled even with the thermostat closed and therefor the radiator is operating, ther fore in use. Unlees use you can completly evacuate the fluid while driving it is always in use.

:spoton:

best you tell everyone what optimum engine parameters you think will be vilolated by the electric fan(and only by an electric fan) blowing air through the radiator, and when if ever an engine is run to such optimum parameters.

Actually this has already been gone over... best you try reading before posting.

I really have to ask... do you actually think before you type.

Engines don't just magically move the car, they are a fine balance of working components. Changing timing, changing fluid pressures, altering mix ratios... be it large or mall will have an affect of your engine. As we found out this week, a slighly obstructed journal can reduce the lifespan of engine components.
Man, we've all seen example where people make slight alteration to their engine that seem harmless only to find that through a series of small domino like affects, something eventually fails!

I know alot of chicks that think as long as the engine has fuel is all good, I wasn't expecting actual car enthusiast to doubt the intricate operation of a combustion engine and its components.

Any ways you guys can talk in circles amoungst yourselves, just don't offence when I don't let you nears my engine.

:spoton:

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#32 _torbirdie_

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Posted 08 May 2009 - 07:37 AM

I really have to ask... do you actually think before you type.

Engines don't just magically move the car, they are a fine balance of working components. Changing timing, changing fluid pressures, altering mix ratios... be it large or mall will have an affect of your engine. As we found out this week, a slighly obstructed journal can reduce the lifespan of engine components.
Man, we've all seen example where people make slight alteration to their engine that seem harmless only to find that through a series of small domino like affects, something eventually fails!

I know alot of chicks that think as long as the engine has fuel is all good, I wasn't expecting actual car enthusiast to doubt the intricate operation of a combustion engine and its components.

Any ways you guys can talk in circles amoungst yourselves, just don't offence when I don't let you nears my engine.

426, wouldnt it just have been easier to admit that what you wrote was nonsense about a constantly running electric fan somehow critically affecting engine life/performance/parameters(LOL) rather than just pasting a whole lot of sentences together that basically say, "little things can affect the engine", true, not that anyone here believes changing the fuel mix or timing is a "little thing"

What you still havent taken(or admitted defeat on) in is that engine cooling systems are designed so that drastic changes in airflow wont change the operating temp of the engine(ie they have thermostats), its performance or otherwise, it can cope with the mild amount of air that a 14in electric fan puts in, just as it can cope with ram air anywhere from speeds of 60km/h to 200km/h

Ill leave it at that, and so should you unless you can bring to the table some plausible facts on how engine "parameters" would be affected by the extra airflow from a 14in fan.

Edited by torbirdie, 08 May 2009 - 07:42 AM.

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#33 76lxhatch

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Posted 08 May 2009 - 07:44 AM

Well said ^^^

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#34 rodomo

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Posted 08 May 2009 - 08:38 AM

Bombadoor does approx 185kph down the main straight at Sandown.
Thermostat fitted.
I leave the thermo fans off until the engine is at operating temp. while lining up then monitor the temp. till I go down the ramp onto the track and then turn them off and leave them off.
After 5 laps, the temp gauge barely registers.

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#35 _Squarepants_

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Posted 08 May 2009 - 05:32 PM

Maybe we'll have to agree to disagree.
This is supposed to be a discussion, not an arguement.
I'll admit I was rotten drunk when I posted my last few comments and I was prolly dribbling a bit, and now that I've re-read everything here with a clearer head, I'll still say that I wouldn't do it, mainly because it would wear the fan out faster.
I believe this was the original concern, anyway.
Take it easy guys and gals, and be happy. :spoton:

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#36 TerrA LX

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Posted 09 May 2009 - 04:25 PM

Optimum temp is dictated by clearances set by the engine builder, usually somewhere around the 100Deg C mark.

There is no need to run a fan any longer than needed, as above the fan suffer unwanted strain as will the load on the electrical system.

Engine temp in most street cars is controlled by the thermostat and there is a bypass installed to prevent any system damage.

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#37 ToRunYa

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Posted 09 May 2009 - 04:40 PM

my thermo is on when the car is on. has been like that for 8 years. never had a problem with either motor or fan. would rather it be too cold than cooked. yadda yadda on prem wear on motor blargh raar. it still goes happily so neerrr... dun care! LOL