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> Spal Fans, which direction
flmont
post Sep 10 2017, 07:10 PM
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is there a way to test Spal fans for there direction,wether they pull or push,.?? Attached Image
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old dog
post Sep 10 2017, 07:47 PM
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QUOTE(flmont @ Sep 10 2017, 06:10 PM) *
is there a way to test Spal fans for there direction,wether they pull or push,.??

Connect it up ! Looking at the picture, that one will pull if spun clockwise. SPAL has a pretty good website if you can pull a number off of the fan.
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gereed75
post Sep 10 2017, 07:52 PM
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In general, you want it to pull. Just did one and from memory the wires are color coded for + red and - black.

Also, I am not a motor expert, but I believe these brushed DC motors will spin either way, depending on the applied polarity. Motor experts are welcome to set us straight on that one.
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McMark
post Sep 11 2017, 05:41 AM
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They will spin either way, but SPAL specifies a direction, and I respect their brand enough to trust them. So I say find out which way it goes by the part number, and if it's not what you need get a different one.
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IronHillRestorations
post Sep 11 2017, 06:06 AM
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They make pushers and pullers, so you need the correct one. I'll opine that the fan blades are made to work best when used in the correct orientation.
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gereed75
post Sep 11 2017, 06:06 AM
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Yea you are right Mark. The motor may operate in either direction but the blades are optimized for their designed direction of rotation. The fans come in either push or pull versions for the same motor.

Oops, beat meet to it Perry
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flmont
post Sep 11 2017, 02:58 PM
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Do U think the picture of the fan I have is a puller type fan..?? Thanks..Frank
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76-914
post Sep 11 2017, 03:01 PM
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Puller. Note the blades distance from one side as opposed to the other?
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flmont
post Sep 11 2017, 03:17 PM
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ah cool,..I have 2 more just like it..!!
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jd74914
post Sep 11 2017, 04:14 PM
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QUOTE(76-914 @ Sep 11 2017, 04:01 PM) *

Puller. Note the blades distance from one side as opposed to the other?

Not so fast there...check the part number. I'm 99% sure SPAL fans don't always spin CW and some of their pullers use the same blade design and clocking orientation as pushers and vice versa. They have identical looking fans with different part numbers for pushing and pulling with slightly different prices too so there may be subtle motor or wiring differences.
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flmont
post Sep 11 2017, 04:21 PM
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I have been trying to get with there tech dept not much luck tho...
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jd74914
post Sep 11 2017, 04:40 PM
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Do you have the number?
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bdstone914
post Sep 11 2017, 10:15 PM
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QUOTE(76-914 @ Sep 11 2017, 02:01 PM) *

Puller. Note the blades distance from one side as opposed to the other?


Blades on fans are spaced to avoid a harmonic drone noise at certain operational RPM's

Ever hear a cheap house fan making rhythm like noise ? Comes from evenly spaced blades.
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bdstone914
post Sep 11 2017, 10:18 PM
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QUOTE(flmont @ Sep 11 2017, 03:21 PM) *

I have been trying to get with there tech dept not much luck tho...


A friend Terry Maresh is a main sales dude there. Call him. He knows his stuff. Known him for 20 years. Tell him I said hi.
Bruce
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bdstone914
post Sep 11 2017, 10:27 PM
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QUOTE(gereed75 @ Sep 10 2017, 06:52 PM) *

In general, you want it to pull. Just did one and from memory the wires are color coded for + red and - black.

Also, I am not a motor expert, but I believe these brushed DC motors will spin either way, depending on the applied polarity. Motor experts are welcome to set us straight on that one.


Generally true but some motors are reversible and fan makers do not like to have double the fan SKU's by having the wire colors consistent to + pos and - neg.
Use one motor in both applications with either a puller or pusher blade.

Some motors are not reversible due to brush angle optimised to reduce drag in one direction. When reversed the wear the brushes fast.
Most of the modern motors are brushless.

Like other have said get the part number off of the sticker on the fan if you can read it.
Or match it to size and config on there site.
Hook it up and see how much air it pulls.

What is the whole deal here? Airflow in and out and cooling what engine ? Fans mainly assist in low speed. The motion of the vehicle should move enough air to cool the engine.
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flmont
post Sep 12 2017, 05:16 PM
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bdstone914,..fans are for cooling a 92' 3.3 suby six,.I did find out today they are puller fans,altho discontinued but iam hoping they work !!
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flmont
post Sep 12 2017, 05:47 PM
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Thanks..!!
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