Difference between L48 and L82 Fan clutches?
01-26-2012, 09:32 AM
#1
Burning Brakes
Thread Starter
Difference between L48 and L82 Fan clutches?
Hi,
What is the difference between L48 and L82 fan clutches, please?
I am building a 383ci engine and my original L48 fan clutch needs
replacing due to wear and tear from dropping it few times over the years.
I have looked on Ecklers website and they list two options.
http://www.ecklerscorvette.com/catal...lutch&x=44&y=7
Which one do I need for my 383ci?
What is the difference between L48 and L82 fan clutches, please?
I am building a 383ci engine and my original L48 fan clutch needs
replacing due to wear and tear from dropping it few times over the years.
I have looked on Ecklers website and they list two options.
http://www.ecklerscorvette.com/catal...lutch&x=44&y=7
Which one do I need for my 383ci?
01-26-2012, 12:45 PM
#2
Team Owner
If you have a 180F thermostat in the cooling system, I would think that the clutch for the 68-70 years would be best. If you have a 195F stat in the engine, get the clutch for a 74-81 with A/C.
01-26-2012, 03:03 PM
#5
Burning Brakes
Thread Starter
And from the AM:
‘the fan clutch Yellow paint mark is to be matched with paint mark on O.D and backside of water pump hub at assembly’
I have a brand new Edelbrock pump and about to order new clutch.
How do I match the clutch to the pump?
‘the fan clutch Yellow paint mark is to be matched with paint mark on O.D and backside of water pump hub at assembly’
I have a brand new Edelbrock pump and about to order new clutch.
How do I match the clutch to the pump?
01-26-2012, 05:26 PM
#6
Team Owner
You don't. I believe that 'matching' process was to optimize balance of the water pump and fan (allow some cancellation of balance errors between the two parts when assembled).
Who knows how well balanced the fan is [today]? And, the aftermarket water pump you buy? Keep your fingers crossed. Once you fire it up, check for abnormal vibration as you rev the engine in your garage.
Anybody know how to get individual parts balanced these days??? If you have vibration in that area, you could always remove the fan mounting bolts, rotate the fan 180 deg {relative to the water pump shaft}, bolt it back up and retry it.
Who knows how well balanced the fan is [today]? And, the aftermarket water pump you buy? Keep your fingers crossed. Once you fire it up, check for abnormal vibration as you rev the engine in your garage.
Anybody know how to get individual parts balanced these days??? If you have vibration in that area, you could always remove the fan mounting bolts, rotate the fan 180 deg {relative to the water pump shaft}, bolt it back up and retry it.
Last edited by 7T1vette; 01-26-2012 at 05:29 PM.
01-26-2012, 06:34 PM
#7
Burning Brakes
Thread Starter
Sorry, I am getting my head round these fan clutche's
Looked at Hayden web and found three options: http://www.haydenauto.com/Featured%2...s/Content.aspx
#2741 Heavy-Duty Thermal
• Turns the fan 80-90% of the shaft speed when engaged for increased cooling.
• Turns the fan 20-30% of the shaft speed when disengaged.
• Used with deeper pitch fans. (2 -1/2” of pitch).
• Land and groove design with 26.0 Sq. In. of working area allows higher operating RPM’s.
• Identified by finned aluminum faceplate and thermal spring on the front.
#2714 80-82 cars and #2713 69-71 350ci, 70-74 454 ci Standard Duty Thermal
• Turns fan 60-70% of shaft speed when engaged.
• Disengage to 20-30% of the shaft speed
• Used with lighter pitch fans. (1-1/2” of pitch).
• Flat plate impeller design with 11.4 Sq. In. of working surface.
• Identified by a smooth steel faceplate & thermal spring assembly on the front side.
Looked at Hayden web and found three options: http://www.haydenauto.com/Featured%2...s/Content.aspx
#2741 Heavy-Duty Thermal
• Turns the fan 80-90% of the shaft speed when engaged for increased cooling.
• Turns the fan 20-30% of the shaft speed when disengaged.
• Used with deeper pitch fans. (2 -1/2” of pitch).
• Land and groove design with 26.0 Sq. In. of working area allows higher operating RPM’s.
• Identified by finned aluminum faceplate and thermal spring on the front.
#2714 80-82 cars and #2713 69-71 350ci, 70-74 454 ci Standard Duty Thermal
• Turns fan 60-70% of shaft speed when engaged.
• Disengage to 20-30% of the shaft speed
• Used with lighter pitch fans. (1-1/2” of pitch).
• Flat plate impeller design with 11.4 Sq. In. of working surface.
• Identified by a smooth steel faceplate & thermal spring assembly on the front side.
01-26-2012, 11:02 PM
#8
Team Owner
I'm surprised that the specs don't tell you at what temperature they switch over. That would seem to be the most important part of their function.
01-27-2012, 03:48 AM
#9
From Hayden FAQ
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.
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.
01-27-2012, 03:49 AM
#10
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.
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.
