Fac Clutch experts----I need your help again :)
Thread Starter
Melting Slicks
Joined: Aug 1999
Posts: 3,123
Likes: 13
From: Hollywood, Florida
Fan Clutch experts----I need your help again :)
Thanks to Jackson, I went to Hayden's website to find a fan clutch that has the dimensions I need.http://forums.corvetteforum.com/zerothread?id=393628
They are 2714-standard duty, 2747 heavy duty, and 2799 extreme duty. http://www.haydenauto.com
Considering the South Florida heat, A/C, inherent poor air flow, etc., I went with the Extreme duty #2799.
The 2747 and 2799 turn at 80-90% shaft speed when engaged, as opposed to 50-60% for the standard duty 2714.
Let me tell you, when I started up the engine, it sounded like a jet intake and you can truely feel MUCH more air being pulled thru the radiator.
Now the question, is the 80-90% fan speed too much for the fan to accept??? I RARELY if ever have it above 4000RPM, but with 3.36gears, it turns about 3000 at 70MPH.
I don't care about the added noise (it sounds cool), but I don't want to be pulling chunks of fan out of my shroud/radiator/etc. either.
IF I keep this fan clutch, I'm curious to see if the temps come down a bit on the highway. Been running about 200-205 without the A/C. I'll let you know.
Ideas, advice, suggestions????????
[Modified by shoptek, 5:50 PM 9/25/2002]
[Modified by shoptek, 5:50 PM 9/25/2002]
They are 2714-standard duty, 2747 heavy duty, and 2799 extreme duty. http://www.haydenauto.com
Considering the South Florida heat, A/C, inherent poor air flow, etc., I went with the Extreme duty #2799.
The 2747 and 2799 turn at 80-90% shaft speed when engaged, as opposed to 50-60% for the standard duty 2714.
Let me tell you, when I started up the engine, it sounded like a jet intake and you can truely feel MUCH more air being pulled thru the radiator.
Now the question, is the 80-90% fan speed too much for the fan to accept??? I RARELY if ever have it above 4000RPM, but with 3.36gears, it turns about 3000 at 70MPH.
I don't care about the added noise (it sounds cool), but I don't want to be pulling chunks of fan out of my shroud/radiator/etc. either.
IF I keep this fan clutch, I'm curious to see if the temps come down a bit on the highway. Been running about 200-205 without the A/C. I'll let you know.
Ideas, advice, suggestions????????
[Modified by shoptek, 5:50 PM 9/25/2002]
[Modified by shoptek, 5:50 PM 9/25/2002]
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Re: Fan Clutch experts----I need your help again :) (shoptek)
Hmmm ... dunno if I've helped or hindered here ... but ... according to Hayden:
Hayden's approximation for engaged spin rate:
2747 (thermal Heavy Duty) & 2799 (Thermal Severe Duty) about 90% water pump shaft speed when engaged.
2714 (thermal Standard Duty) about 75% water pump shaft speed when engaged.
All thermal fan clutches disengage and spin at about 33% of water pump shaft speed when cooling not required.
No numbers published, but NON-thermal are constantly engaged & have a limited max spin rate.
I'd put a few miles on it ... see if it disengages for reasonably lengthy interval. Just my opinion, but I doubt your demands on fan blade are excessive ... but if clutch won't disengage you're wasting power & fuel.
Jack
Hayden's approximation for engaged spin rate:
2747 (thermal Heavy Duty) & 2799 (Thermal Severe Duty) about 90% water pump shaft speed when engaged.
2714 (thermal Standard Duty) about 75% water pump shaft speed when engaged.
All thermal fan clutches disengage and spin at about 33% of water pump shaft speed when cooling not required.
No numbers published, but NON-thermal are constantly engaged & have a limited max spin rate.
I'd put a few miles on it ... see if it disengages for reasonably lengthy interval. Just my opinion, but I doubt your demands on fan blade are excessive ... but if clutch won't disengage you're wasting power & fuel.
Jack
