Fan Noise
04-02-2013, 10:20 PM
#1
Heel & Toe
Thread Starter
Member Since: Jul 2003
Location: Lees Summit Mo.
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
Fan Noise
1974 BB conv. Just got it back from engine rebuild. 496, alum heads, decent cam, headers etc. replaced clutch on cooling fan because it was leaking. Believe fan is stock. First thing I noticed was the noise. Researched it here and decided maybe clutch was bad and not disengaging. Hayden 4799. Installed another new one. Seemed like it was working correctly at first. Noise went away shortly after starting, but car warmed up to 210-215 degrees and fan didn't seem to be engaging(making noise) On 60 degree day. 160 degree therm. Put on third fan and same as first. Lots of noise all the time but ran cool (180). When shut off engine fan turned several times indicating it was properly disengaged. Any thoughts? Is there a quieter fan solution?
04-02-2013, 10:28 PM
#2
Team Owner
The thermostatic fan should NOT engage until it reaches a specified temperature, which should be about 10 degrees warmer than the intended thermostat. That fan should rotate freely when it has NOT reached its engagement temperature; and, it should stop very quickly (2-3 revs) when it has reached that temperature.
You should find out what thermostate the engine builder used. To match with the clutch-type fan, stat temp should be a bit below that of the fan engagement temp.
You should find out what thermostate the engine builder used. To match with the clutch-type fan, stat temp should be a bit below that of the fan engagement temp.
04-02-2013, 10:34 PM
#3
Heel & Toe
Thread Starter
Member Since: Jul 2003
Location: Lees Summit Mo.
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
It is a 160 degree thermostat and I believe the Hayden should engage around 170 degrees. Maybe it is normal, but makes a lot of noise even when cold, but continues to spin several revolutions when engine is shut off indicating it is disengaged.
04-02-2013, 10:44 PM
#4
Team Owner
Sounds like the fan is defective.
04-03-2013, 06:05 AM
#6
Team Owner
What if you received a defective electric fan? Would you then swap back to a thermostatic fan? The proper solution is to replace the defective item, IMO.
04-03-2013, 07:41 AM
#7
Safety Car
What kind of noise ? The clutch should work or not and if not it locks up making it spin like direct drive. Is it possible the noise is not the fan ? Have you run the motor with out it or with the belt disconnected ?
04-03-2013, 11:02 AM
#9
Melting Slicks
Did you get the 2799, not 4799?
If so, that is a heavy duty clutch, they are designed for things like big trucks, and RV's . I put one in my car, and it never seemed to disengage, on the highway I thought the fan was going to come flying through the hood.
Try a standard duty clutch like this one - http://www.summitracing.com/parts/hd...s/?prefilter=1
If so, that is a heavy duty clutch, they are designed for things like big trucks, and RV's . I put one in my car, and it never seemed to disengage, on the highway I thought the fan was going to come flying through the hood.
Try a standard duty clutch like this one - http://www.summitracing.com/parts/hd...s/?prefilter=1
04-03-2013, 11:19 AM
#10
Team Owner
Electric fans are not quieter nor more efficient. They are still noisy when they run. And, when running they 'eat' electricity, which is generated by the alternator (which, in turn, is driven by a fan belt via the water pump...hmmmm); that energy is equivalent to the mechanical energy absorbed by a 'working' stock fan. You don't get any "free lunch" by swapping from mechanical to electric fan(s).
04-04-2013, 02:46 PM
#13
Instructor
some hayden fan clutch #
70-74 454 2713
72-79 350 2711
62-68 all 2711
74-80 w/hd cooling 2741
these are from haydens site.
a thermal fan clutch is engaged on cold startup due to fluid has drained into working area of clutch after shutdown.the clutch will slow down in a short period after startup due to pumping action produced by difference in speed between the shaft and body of clutch.
Standard duty thermal turns 60-70% of shaft speed when engaged,disengaged to 20-30% of shaft speed.
Heavyduty thermal turns 80-90% of shaft speed when engaged,disengaged to 20-30% of shaft speed.
70-74 454 2713
72-79 350 2711
62-68 all 2711
74-80 w/hd cooling 2741
these are from haydens site.
a thermal fan clutch is engaged on cold startup due to fluid has drained into working area of clutch after shutdown.the clutch will slow down in a short period after startup due to pumping action produced by difference in speed between the shaft and body of clutch.
Standard duty thermal turns 60-70% of shaft speed when engaged,disengaged to 20-30% of shaft speed.
Heavyduty thermal turns 80-90% of shaft speed when engaged,disengaged to 20-30% of shaft speed.
04-04-2013, 07:12 PM
#14
Team Owner
The noise is generated by the fan...not the fan clutch. It's just air noise generated as the fan is actively pulling the air through the radiator. And, it should only do that when the coolant is hot enough to need additional cooling.
04-05-2013, 09:40 AM
#15
Le Mans Master
Member Since: Mar 2008
Location: Oxford MA-----You just lost the game!!!!
Posts: 5,948
Likes: 0
Received 63 Likes
on
53 Posts
Scott
04-05-2013, 09:59 AM
#16
Safety Car
We still have no idea what kind of noise he is referring too. I have an after market fan clutch that makes no noise , and works as it should.
So what are we talking here ? Clicking ? Buzzing ? Clanking ? What ?? what ??? LMAO .. What kind of Noise ? ? So far all this advice and as far as anyone knows , he could be referring to Tinnitus
So what are we talking here ? Clicking ? Buzzing ? Clanking ? What ?? what ??? LMAO .. What kind of Noise ? ? So far all this advice and as far as anyone knows , he could be referring to Tinnitus
04-05-2013, 11:26 AM
#17
Melting Slicks
Here's info directly from Hayden's website - http://www.haydenauto.com/Installati...s/Content.aspx
So, when the fan is engaged, the Heavy/Severe duty fan can spin around 5 times for every 3 rotations of the Standard duty fan.
Q. At what temperatures do fan clutches engage?
A. Most fan clutches engage at about 170° F air temperature (about 180-190° F engine temperature). They reduce the temperature about 20° F before disengaging.
Q. What is the difference between a standard, heavy and severe duty fan clutch?
A. Each fan clutch type is designed to simulate the performance of the original equipment clutch that it replaces. All fan clutches are for specific applications and should be applied only on the application for which they are cataloged.
Standard Duty Thermal
Turns the fan 50-60% of shaft speed when engaged. Used with fans with lighter pitch. (1-1/2" of pitch) Flat plate impeller design with 30 Sq. In. of working surface.
Heavy-Duty Thermal
Turns the fan 80-90% of the shaft speed when engaged for increased cooling. Used with deeper pitch fans. (2 1/2" of pitch). Land and groove design with 47 Sq. In. of working area allows higher operating RPM's.
Severe Duty Thermal
Turns the fan 80-90% of the shaft speed when engaged. Used with deeper pitch fans. (2- 1/2" of pitch). Land and groove design with 65 Sq. In. of working area. Larger working surface provides cooler running and longer life expectancy.
A. Most fan clutches engage at about 170° F air temperature (about 180-190° F engine temperature). They reduce the temperature about 20° F before disengaging.
Q. What is the difference between a standard, heavy and severe duty fan clutch?
A. Each fan clutch type is designed to simulate the performance of the original equipment clutch that it replaces. All fan clutches are for specific applications and should be applied only on the application for which they are cataloged.
Standard Duty Thermal
Turns the fan 50-60% of shaft speed when engaged. Used with fans with lighter pitch. (1-1/2" of pitch) Flat plate impeller design with 30 Sq. In. of working surface.
Heavy-Duty Thermal
Turns the fan 80-90% of the shaft speed when engaged for increased cooling. Used with deeper pitch fans. (2 1/2" of pitch). Land and groove design with 47 Sq. In. of working area allows higher operating RPM's.
Severe Duty Thermal
Turns the fan 80-90% of the shaft speed when engaged. Used with deeper pitch fans. (2- 1/2" of pitch). Land and groove design with 65 Sq. In. of working area. Larger working surface provides cooler running and longer life expectancy.
04-08-2013, 09:50 PM
#18
Heel & Toe
Thread Starter
Member Since: Jul 2003
Location: Lees Summit Mo.
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
Sorry, been out of town and tied up last few days. The noise is the air being pulled through by the fan I believe. Maybe it is just the way it is. As one post suggested maybe it is just because it is working correctly and the old one was not as it was leaking a little fluid. Even though it was expensive I ordered what is supposed to be the correct one from Paragon. Should be here this week. As soon as weather permits I will try it out and report back. Thanks for all the input.
04-08-2013, 10:04 PM
#19
Heel & Toe
Thread Starter
Member Since: Jul 2003
Location: Lees Summit Mo.
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
By the way the Hayden clutches were all 2799. Tried three new ones. First one pulled so much air it was very loud and never seemed to disengage(at least I thought). Tried second one and it quieted down a short time after start and seemed to work properly, but car heated up. Got a third one. Same as first, lot of air noise,but ran cool. Will see how different brand works.