main rad fan cfm rate, data needed

[Dirtylouie]

Hi there! help needed desperately. Original main rad fan airflow CFM rate, anyone? Or at least amps draw of the motor?

Thanks in advance,
Mike

[Jamo]

Which fan? THE ABY / RS2 fan is 500 watts AFAIK

[Dirtylouie]

Which fan? THE ABY / RS2 fan is 500 watts AFAIK

thanks, Jamo, for your quick reply, a 3B fan to be precise. Is it of any difference with ABY?

[GazzaG60]

cfm will be quite high.

i looked into replacing mine if thats what you are after.

IIRC the correct size is the 12" pacet pro to be able to make it fit into the shroud. ive used one before on the corrado it was 1668cfm. expect them to be 1200-1600cfrm or so. id go for about 900-1200 for the factory mamouth.

[Dirtylouie]

cfm will be quite high.

i looked into replacing mine if thats what you are after.

IIRC the correct size is the 12" pacet pro to be able to make it fit into the shroud. ive used one before on the corrado it was 1668cfm. expect them to be 1200-1600cfrm or so. id go for about 900-1200 for the factory mamouth.

Sure about 1600 cfm? i mean corrado's engine's less powerful and much "colder" as it's a naturally aspirated one.

[GazzaG60]

corrado engine was a supercharged 8v running a 65mm pulley. its warmer than an s2 engine with a radiator about 1/2 the size.

the shroud is worth about 30% IIRC. without it you cool one spot. the pacet will run at similar noise but flow more air.

what makes you think that an S2 will be hotter or more powerful?

ive already been down this road and know it works. im thinking of doing the same as now my fan is drawing a little to heavy and it can be felt when it kicks in.

decide whether you want a puller or pusher. IIRC pusher is more efficient. 1168cfm would suck a rag to the front of the rad pulling through it.

[GazzaG60]

typo 1168 meant 1668.

[Dirtylouie]

corrado engine was a supercharged 8v running a 65mm pulley. its warmer than an s2 engine with a radiator about 1/2 the size.

the shroud is worth about 30% IIRC. without it you cool one spot. the pacet will run at similar noise but flow more air.

what makes you think that an S2 will be hotter or more powerful?

ive already been down this road and know it works. im thinking of doing the same as now my fan is drawing a little to heavy and it can be felt when it kicks in.

decide whether you want a puller or pusher. IIRC pusher is more efficient. 1168cfm would suck a rag to the front of the rad pulling through it.

it's a little bit more sophisticated, then just replacing a fan.
i'm after full AAN conversion, including intake and ACE front rad with a dual 10" slim pusher fan, 850 cfm each.
Should work with these imo

[GazzaG60]

ah ok.

i know the rad. got one on the shelf. yes they will be plenty. they are the size we used on a couple of subaru's 2 fans. think 1100cfm each pacets. its a pretty big rad that one.

the s2 fan is bigger due to the location of the rad thats all.

another option if you are worried on the cooling is fit 1 biggter unit at the end of the rad closest to the thermostat flow wise.

[Dirtylouie]

ah ok.

i know the rad. got one on the shelf. yes they will be plenty. they are the size we used on a couple of subaru's 2 fans. think 1100cfm each pacets. its a pretty big rad that one.

the s2 fan is bigger due to the location of the rad thats all.

another option if you are worried on the cooling is fit 1 biggter unit at the end of the rad closest to the thermostat flow wise.

He-he Rad is original unit from i4 16V Audi engine (ACE) btw it's the same that is used for ABK mit klima It's not that big actually, and flow rate for the fan, claimed by manufacturer is only 850 cfm. We plan to use 2 of these,
How come you calculate 1100? Is it more complicated, then just multiplying it by 2? (850x2=1700)

[GazzaG60]

think i have misled in the type i have done. sorry

the fans on the ace/6a are nice slim ones from the factory. the ones supplied are 850cfm from audi i think you said. the ones we used as they were the same size were pacet pro. deisgned to flow more they did about 1100 each.

im no expert in flow rates. id do as you did. it may be that id replace the second small fan with a bigger unit for max efficiency in traffic.

[Dirtylouie]

think i have misled in the type i have done. sorry

the fans on the ace/6a are nice slim ones from the factory. the ones supplied are 850cfm from audi i think you said. the ones we used as they were the same size were pacet pro. deisgned to flow more they did about 1100 each.

im no expert in flow rates. id do as you did. it may be that id replace the second small fan with a bigger unit for max efficiency in traffic.

now i see... you got it wrong, we use a radiator from ACE, fans are aftermarket slim ones, universal model. set on the outer side, reversable, used as a pusher. BTW Which ones have you used? 1100 cfm sounds attractive

[GazzaG60]

good so you have imo got it correct.

pacet pro. they flow better than the clubman ones but cost more. they change the design from time to time though.

like i say, 1 small one if space is an issue and one larger works better again.

[Dirtylouie]

good so you have imo got it correct.

pacet pro. they flow better than the clubman ones but cost more. they change the design from time to time though.

like i say, 1 small one if space is an issue and one larger works better again.

err.. checked them... to thick. thinnest is 3 inch, and with a front rad only 2" can be fitted =(

[GazzaG60]

the pro's can be thicker than the clubman IIRC its about cfm.

looks like you have a good solution already though to me.