Fans- Suck or Blow?

[Craighb]

I know ive read this in a recent post but cant find it using my iPhone in the garage!

Just fitted a Pro-Alloy rad and run the car up to temp. when the fans cut in they were blowing air out of the front of the car. Surely they should be drawing air through the rad and out of the top of the clam.

Can someone confirm.

Thanks.;

[mgbond]

Craighb said:

I know ive read this in a recent post but cant find it using my iPhone in the garage!

Just fitted a Pro-Alloy rad and run the car up to temp. when the fans cut in they were blowing air out of the front of the car. Surely they should be drawing air through the rad and out of the top of the clam.

Can someone confirm.

Thanks.;

They blow onto the rad from the cockpit side so yes it will come out the front.

Bondy

[AverageMPH]

mgbond said:

Craighb said:

I know ive read this in a recent post but cant find it using my iPhone in the garage!

Just fitted a Pro-Alloy rad and run the car up to temp. when the fans cut in they were blowing air out of the front of the car. Surely they should be drawing air through the rad and out of the top of the clam.

Can someone confirm.

Thanks.;

They blow onto the rad from the cockpit side so yes it will come out the front.

Bondy

Mine draw air through the rad, drawing from the front and out through the top of the clam.

[Craighb]

Oooooh K. Unfortunately, thats not what i'd call a concensus! Now I'm confused- logic would dictate that the fans draw cold air through the rad assisted by the forward movement of the car. If they blew air from back to the front wouldnt the airflow just be cancelled out?

[rb5230]

Craighb said:

Oooooh K. Unfortunately, thats not what i'd call a concensus! Now I'm confused- logic would dictate that the fans draw cold air through the rad assisted by the forward movement of the car. If they blew air from back to the front wouldnt the airflow just be cancelled out?

Makes sense to me too.

[AverageMPH]

rb5230 said:

Craighb said:

Oooooh K. Unfortunately, thats not what i'd call a concensus! Now I'm confused- logic would dictate that the fans draw cold air through the rad assisted by the forward movement of the car. If they blew air from back to the front wouldnt the airflow just be cancelled out?

Makes sense to me too.

Thats what mine does, which makes sense to me too.

[mgbond]

Fans wouldn't be running when the car is driving as this would cool the rad anyway. The way to think about it is as follows:

Noble added a shroud so when the fans blew it forced the air all over the rad rather than straight through in small areas. Not sure it would suck as efficiently.

I may well be wrong as you can feel lots of air coming out from the top of the clam. Just thought it was the air reflecting back that didn't blow through.

Bondy

[TuxMan]

On mine the air suck through the rad :-)

[blueg33]

I am not a Noble owner but surely logic dictates that the fans assist the flow of moving air so it should not blow out of the front. I have a TVR Tuscan which has scoops for the fans in the same vein as the Noble clamshell and all correctly wired Tuscans draw air from the front towards the rear so it does not blow out of the front, Lotus Elise is the same.

[worty]

Is it really sucking or blowing or is it equalisation from high to low pressure?


I'm not technical but I think they suck as they do come on while the car is moving.

HTH
worty

[SwankBaton]

Def. sucks air through rad and blows out through top of clam.

Doesnt a Ferrari F50 go the other way though?

[Craighb]

Crawled out from under the car, as I've had enough tonight. Had a close look at the fans and on the inside hub is a direction of rotation. With my fans blowing air from back to front, the direction is incorrect, so they seem to be designed to suck air through from front to back. I'm going to reverse the direction so they rotate as per the decal on the fan.

Bondy - you may want to check yours, see if they are the same.

Cheers guy's, hopefully see you all next Tuesday.

[wessexrfc]

Suck, defo, anyway blows just a figure of speech god-damm-it woman


But yes mine sucks, fans that is, great for warming up the garage. hth

[mgbond]

Craighb said:

Crawled out from under the car, as I've had enough tonight. Had a close look at the fans and on the inside hub is a direction of rotation. With my fans blowing air from back to front, the direction is incorrect, so they seem to be designed to suck air through from front to back. I'm going to reverse the direction so they rotate as per the decal on the fan.

Bondy - you may want to check yours, see if they are the same.

Cheers guy's, hopefully see you all next Tuesday.

My fans work really well, so assume they are right but I'm wrong

Bondy

[ThatPhilBrettGuy]

swankBaton said:

Doesnt a Ferrari F50 go the other way though?

Only if the fans are wired up wrong.

[andygtt]

blowing back to front is the wrong way... one of our fans comes on permanently when the air con is switched on (on the 3L), surely if the fan was reversed to blow forward the fan will burn out?

regardless the air should enter the front and exit the rear, if its doing anything else best get it corrected IMO.

[bigsmiffy]

Just checked my M400 & it sucks through the rad & out of the clam, maybe the plug connectors to the fans is wrong

[paulcundy]

Sorry but this really is in the "no brainer" category of question. The fans assist the normal path of air over teh rad. It is possible to have the fans running whilst the car is moving. Whether they are on the front blowing or on the back of the rad sucking the air should allways go in at the front and out at the back..........

Regards
Paul C

Edited by paulcundy on Friday 6th May 09:40

[jamescmr2]

agree with Paul, air flow from front to back.

being pedantic... don't fans only ever blow(push). i.e. they push air away, and of course more air moves in to take its place and the cycle continues and so on... of course the pressure changes go with this. just like the propeller on a ship. anyway i'll stop being a geek.

cheers

[andygtt]