zxrlocost
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| posted on 3/1/06 at 09:07 AM |
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fan query could be interesting?
I used to have a nissan 300zx which was a twin turbo V6
now if i remember rightly the fan used to run all the time as standard which I think is a brilliant idea
the other brilliant idea is that you couldnt hear it,,
I also remember that throughout the whole year of owning I dont remember the temp gauge going above/below about 40% of the gauge even if sat in
traffic or freezing cold trips
this could be a good one of for anyone with a BEC??
any thoughts anyone
chris
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britishtrident
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| posted on 3/1/06 at 10:48 AM |
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Did it have air conditioning ? if so it was running on slow speed to cool the AC condensor.
Electric fans and viscous fans that only cut in when required were a major advance over fans that ran constantly -- it would surprise you how much
power a fan wastes.
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Genesis
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| posted on 3/1/06 at 10:54 AM |
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Considering the fuse rating for most fans is 10A that gives you some idea on how much power they can use. I understand it's more surge than
running power but even so... it is a lot of power as BT says! 
Going fishin'
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zxrlocost
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| posted on 3/1/06 at 11:02 AM |
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ok that stuffs that one up then
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MkIndy7
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| posted on 3/1/06 at 01:40 PM |
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Might be a bit of a basic understanding but don't racing cars just run with no stat to achieve lower running temps?
That way as the water is constantly flowing through the Rad etc and there is never a store of high temperature water in the cylinder block.
I'm presuming as they warm them up carefully and then run them at full pelt so they stay warm then there ok.
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smart51
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| posted on 3/1/06 at 02:11 PM |
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the thermostat is there to "protect" the engine when it is too cold by keeping what warm water there is in the engine. Once warm, the
coolant flows through the thermostat to the radiator where it is cooled. If you have a coolant preheater and only use the car for racing then
removing the thermostat may be an idea but for road use, leave it in.
I went out the other day in the cold. The highest coolant temperature seen all day was about 55°. When cruising along a long 40 MPH road, the
temperature (after the thermostat) dropped below 40°. The incoming wind was cooling the rad so much I guess. In this case, the stat would be closing
to keep heat in the block.
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britishtrident
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| posted on 3/1/06 at 02:34 PM |
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Thermostat & by-pass keep the difference top and bottom of the engine under control.
For max power and engine longevity you don't want the temperature of the cylinder walls to fall to low.
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ChrisGamlin
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| posted on 3/1/06 at 06:30 PM |
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Also bear in mind that the fan itself is about as forceful as a fart in a hurricane once you're doing reasonable speeds, so there's really
little use in it being on until the temps rise and you're going quite slowly.
[Edited on 3/1/06 by ChrisGamlin]
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kb58
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| posted on 3/1/06 at 09:12 PM |
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quote:
Originally posted by Genesis
Considering the fuse rating for most fans is 10A that gives you some idea on how much power they can use. I understand it's more surge than
running power but even so... it is a lot of power as BT says!
It's not that much really. Figure 5A running current, so 12V * 5A = 60W. 60W / 760W / hp = 0.079hp. Figure charging inefficiencies and such
by doubling that, so having the fan running wastes rougly 0.16hp.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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