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Fan air speed
http://international2cvfriends.com/forum/viewtopic.php?f=7&t=2712		 Page 1 of 1
Author:  notsmartcar [ February 17th, 2011, 11:13 pm ]
Post subject:  Fan air speed
Has any one worked out the speed in mph that air is pulled through the fan on a 2cv per 1000 revs if stationary .. do the racers remove their fans or modify them.. is there a road speed at which air is pushed through faster than the fan pulls it through..fan only has blades on the out side of the center dome with no fan (just a belt pulley) would the funnel effect push even more air through at speed .. Lomaxes have no cowling on at all and they seam to survive .. Is the fan just there for slow traffic
Author:  knightley [ February 17th, 2011, 11:15 pm ]
Post subject:  Re: Fan air speed
With the 2CV standing still or doing 60 mph? Or against a gale wind?

Now you've edited your post Notsmart, my reply is superfluous :lol:
Author:  toomany2cvs [ February 18th, 2011, 12:07 am ]
Post subject:  Re: Fan air speed
notsmartcar wrote:
Lomaxes have no cowling on at all and they seam to survive ..


Lomaxes have the barrels & heads hanging out in the wind, unlike 2cvs.
Author:  Terry [ February 18th, 2011, 12:19 am ]
Post subject:  Re: Fan air speed
notsmartcar wrote:
.. Is the fan just there for slow traffic


No .....I've had the pulley break and tried to drive the last few miles to my destination,the car soon started overheating [was a Dyane, btw].

T.
Author:  ken [ February 18th, 2011, 12:23 am ]
Post subject:  Re: Fan air speed
Kevin,
this should keep you busy for a while... ;)
< http://www.offroadvw.net/tech/wes/fan.html >

On UK racers, the fan _sometimes_ has 3 blades removed, but from what I've seen, that's OK for sprint races but not for enduros.
(Edit. As Terry mentioned, because the engines are cowled, they will overheat very quickly if the fan stops working.
2 or 3 laps of Snetterton without noticing that the fan's bust, before engine problems are likely.)

Some Belgian 24 hr racers run without fans in the prototype class, but add some fairly large oil coolers to compensate.

In the standard class at Spa last year, I'm sure that a couple of the cars were running with grille muffs fitted, but it was seasonal weather for the Ardennes in Autumn.

ken

p.s. Lomax in a traffic jam in hot weather, switch the engine off?
Author:  Sean [ February 18th, 2011, 10:19 am ]
Post subject:  Re: Fan air speed
notsmartcar wrote:
Has any one worked out the speed in mph that air is pulled through the fan on a 2cv per 1000 revs if stationary .. do the racers remove their fans or modify them.. is there a road speed at which air is pushed through faster than the fan pulls it through..fan only has blades on the out side of the center dome with no fan (just a belt pulley) would the funnel effect push even more air through at speed .. Lomaxes have no cowling on at all and they seam to survive .. Is the fan just there for slow traffic


there are all sorts of modified fans and theories (after a bump our car lost its blades and gained about 3hp which took it up to the front of the pack....for a bit :lol: ) and even some rather~ erm ~"autistic" views on whether the ducting should be the full depth of the fan tips and the outside radiused for more efficient air flow :?

in traffic the engine is just idling and youll notice that the heater doesn’t. therefore the engine is running cold.

on motorway the heater melts my left boot therefore the engine is hot

in winter it needs restricting so if anything its over cooling. However its not going to end up in catastrophic failure because its running slightly cool.

Id leave it well alone unless you had a engine temp monitor and then you can work out what needs most cooling when and when your in the danger zone.

bit of waffle!- no i dont know the air speed of the cooling fan at specific RPM or the L/Min for that matter it just works

Sean
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