aircon fan

Author
Discussion

V8Dom

Original Poster:

3,546 posts

202 months

Tuesday 26th July 2016
quotequote all
hi ,,
has anyone replaced their aircon cooling fan on the aircon rad?
when using my aircon i find it is drawing too many amps and taking all the charge out of my race alternator.
im limited on space for the alternator so decided to look at changing the fan.
if i use the heater its fine.

if you have what did you use please

MarkWebb

983 posts

217 months

Tuesday 26th July 2016
quotequote all
Not sure what yr alternator is but aircon fan should not draw anywhere near enough to do that! Do you have output/rpm curves for alternator?

V8Dom

Original Poster:

3,546 posts

202 months

Wednesday 27th July 2016
quotequote all
i run a race alternator which is only 60 amp
fan is standard curved one fitted from new, not sure amps but lokks simular to kit car solutions website
with only 60 amps with hetarr fans on , msd etc etc they soon dissapear so any amp saving will help... when rad fans come on thats close too as they draw alot too so looking for low amp solution for aircon, and same amp solution plus higher cfm for rad to cool the summer traffic jams
no roon for bigger alternator due to exhaust design and layout
r

MarkWebb

983 posts

217 months

Sunday 31st July 2016
quotequote all
I fear it will be difficult to find fans with same cfm but significantly less amps.
Alternator does not necessarily need to be bigger physically to have higher output.
I have seen the smallest Denso types with outputs of 140 amps. The other thing is that they can be made to produce a lot of their potential at v low revs as well.
Problem in general with race alternators is that they produce v little at low rpm.
Also are you using the correct drive ratio to get it near to max rpm?
I am facing a similar problem due to my dry sump install.
I am driving the alternator with a toothed belt and I cannot get pulleys to give me good alternator speed.
So I will prob need to buy alternator that gives max current at lower rpm.

V8Dom

Original Poster:

3,546 posts

202 months

Monday 1st August 2016
quotequote all
my dry sumps in the way too

just bought a race 60 amp one thats tiny

v belted so hopefully will just bolt in place

Rscocca

127 posts

124 months

Tuesday 2nd August 2016
quotequote all
Powerbds.com make a 250 amp alt that fits the Amercan speed brackets with a little mod. clears Dry sump systems.

http://www.powerbds.com/products.asp?cat=1254...

V8Dom

Original Poster:

3,546 posts

202 months

Wednesday 3rd August 2016
quotequote all
sadly i have huge headers so no room