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Clockwise or Counterclockwise?

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Old 05-19-2011, 09:18 PM   #1
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Clockwise or Counterclockwise?

How do I tell? I want to buy a fan that bolts to the water pump pulley. It's a SBC 350 from a '72 Nova. There are counterclockwise and clockwise fans. I don't know how to tell. Help is appreciated.
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Old 05-19-2011, 09:34 PM   #2
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Re: Clockwise or Counterclockwise?

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Originally Posted by Paddiee View Post
How do I tell? I want to buy a fan that bolts to the water pump pulley. It's a SBC 350 from a '72 Nova. There are counterclockwise and clockwise fans. I don't know how to tell. Help is appreciated.
Your first clue would be in the rotation of your water pump start your car and find out.

Next either look in the description, or if you are viewing the fan in person. Looking at the front of the motor if the fan is spinning clockwise the blades should be on a downward slope from engine forward. If it spins counterclockwise the blades should slope upward.

Or spin it to see which way it pushes.
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Old 05-19-2011, 09:42 PM   #3
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Re: Clockwise or Counterclockwise?

You want a fan that spins clockwise, pulling thru the rad.
I don't recall fan blade orietation, but you should be able to get a fan from a u-pull-it type of jy, or get a new 1 from your local parts store, Jegs, Summit, etc, or talk to a local mechanic // machine shop.

There are 2 types--
clutch & fixed.

Fixed fan is always turning, clutch fan either works by temperature or rpm, & engages when needed. I forget which makes it operate.

( edit )
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Old 05-19-2011, 10:40 PM   #4
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Re: Clockwise or Counterclockwise?

Quote:
Originally Posted by blackbmagic View Post
Your first clue would be in the rotation of your water pump start your car and find out.

Next either look in the description, or if you are viewing the fan in person. Looking at the front of the motor if the fan is spinning clockwise the blades should be on a downward slope from engine forward. If it spins counterclockwise the blades should slope upward.

Or spin it to see which way it pushes.
I can't start it because the engine is out of the car. It's on an engine stand. It's an OEM long water pump.
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Old 05-19-2011, 11:02 PM   #5
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Re: Clockwise or Counterclockwise?

if its a v-belt setup it is clockwise rotation-most pre-88
chevy v-8 are all clockwise rotation.
If you find a v8 firebird shroud,it is meant for a 17"fan
thirdgen '82-85 camaro v-8 shrouds us a 18.5" fan-
not sure if the camaro shroud will clear the hood on a
firebird.
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Old 05-19-2011, 11:11 PM   #6
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Re: Clockwise or Counterclockwise?

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Originally Posted by 8t2 z-chev View Post
if its a v-belt setup it is clockwise rotation-most pre-88
chevy v-8 are all clockwise rotation.
If you find a v8 firebird shroud,it is meant for a 17"fan
thirdgen '82-85 camaro v-8 shrouds us a 18.5" fan-
not sure if the camaro shroud will clear the hood on a
firebird.
I'm running 1/2 serp, 1/2 V belt. Would that affect anything? I assume it wouldn't. Thanks for the help!
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Old 05-19-2011, 11:13 PM   #7
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Re: Clockwise or Counterclockwise?

Quote:
if its a v-belt setup it is clockwise rotation-most pre-88
chevy v-8 are all clockwise rotation.
If you find a v8 firebird shroud,it is meant for a 17"fan
thirdgen '82-85 camaro v-8 shrouds us a 18.5" fan-
not sure if the camaro shroud will clear the hood on a
firebird.
Chevy v8's are not all clockwise. unless am reading your post wrong.

V belt = clockwise
Serpentine system = counterclockwise

V belt systems the grove on the belt is on the pulley, serpentine system the smooth part on the belt is on the pulley.
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Old 05-19-2011, 11:26 PM   #8
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Re: Clockwise or Counterclockwise?

you missed the"most pre-88"part-AFAIK,the only pre
-88 chevy v-8 with CCW rotation water pump is '84 up
"C4"corvettes.The mid-85 thru '87 partial v-belt setup
is clockwise rotation
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Old 05-19-2011, 11:34 PM   #9
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Re: Clockwise or Counterclockwise?

Quote:
Originally Posted by 8t2 z-chev View Post
you missed the"most pre-88"part-AFAIK,the only pre
-88 chevy v-8 with CCW rotation water pump is '84 up
"C4"corvettes.The mid-85 thru '87 partial v-belt setup
is clockwise rotation
lol just clarifying even more. I gotcha. Thank you much for the info.
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Old 05-19-2011, 11:36 PM   #10
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Re: Clockwise or Counterclockwise?

now i get it....

sometimes when you post
like this the information
could be confusing..... :P
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