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#161
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
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#162
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Quote:
Using a clutch fan as an example. It is always turning. Even when the radiator heat is not locking the thermal control the fan increases load as RPMs increase. The load is increased at all RPMs if the thermal control is locking which causes the clutch fan to move entirely based on engine RPMs. FYI-I would like to add an electric water pump for the same benefits. I haven't looked but my bet is there is not one available.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#163
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I was giving Trader a hard time. Joking.
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#164
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The comparisons you are trying to make with other application type fans are not going to work... and I wish I were a mechanical engineer to explain technically why. But trying to compare say a 5hp fan with a dedicated 5hp engine on it to a 120hp car engine with a fan on the front of it is just not an apples to apples comparison. Rotational mass, condition of fan clutch, etc, etc... will all come into play. bcredliner... I believe there is an electric water pump available for the M54. At least I THINK I remember reading something about them on e46fanatics.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#165
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General question on all BMW models...
Does anyone know which year BMW stopped using mechanical fan clutch (and went electric)? Is it around 2009 on F10 models etc.?
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1998 E39 528i 5sp MT 2006 E53 X5 3.0 6sp MT |
#166
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I think it was generally after the M54 engine. Even some of those were electric... e46 coupes for example.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#167
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Quote:
The electric fan in an E46 included any manual transmission starting in 1999.
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#168
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Electric fans are able to meet cooling requirements becaue they tend to move more air at lower vehicle speeds than the engine fan and because radiators now use aluminum cores for better heat transfer. As the vehicle's speed increases, enough air is forced through the radiator to cool the engine generally, although the electric fan will kick in for additional support under high engine operating temperatures or when the AC compressor is running. Attic fans, room fans and ceiling fans move high volumes of air because of their blade area. As a result, they don't need to run at high rpms and thus don't have the same power requirements. And I don't think any of us would want a 50 inch tall radiator core. As a side note, my 1981 Bonneville diesel was equipped with the heavy duty police cooling option which consisted of a steeper pitched fan, heavy duty locking fan clutch, and double belt drive pulley. When the fan clutch engaged, it felt like it could suck a small car right through the grille, but it would knock 20 degrees off the temperature guage in less than two minutes. When it comes to automobile cooling, it's all about air velocity vs radiator frontal area. 2002 X5 3.0 281,400 miles 2004 325i 120,700 miles Last edited by srmmmm; 07-02-2015 at 10:19 AM. Reason: Corrected HP at 750rpm & 3000rpm. Power goes up by the square as air velocity doubles. |
#169
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lol you guys.
Thanks for the fun reading.
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Previously owned: '03 4.6iS Dinan Supercharged |
#170
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Power is squared as speed doubles. I've corrected the horsepower figures in my original response. Too much late night calculation effort involved. They should have been:
750 rpm - 1 horsepower 1500 rpm - 4 horsepower 3000 rpm - 16 horsepower Now does an automobile engine fan ever really pull 16 horsepower? Probably not because the viscous drive clutches never fully "lockup". There is always some slippage which limits the top rpm of the fan blade itself. If it's a pure mechanical fan, bolted straight to the drive pulley, then the blades will flex, reducing the horsepower needed to spin the higher rpms. You're correct on the stationary dyno situation emphasizing the fan load, but going to the electric fans was a major fuel mileage contributor when we brought out the "X" cars (Chevy Citation, Pontiac Phoenix) in 1980 at GM. 2002 X5 3.0 281,400 miles 2004 325i 120,700 miles |
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