Tom Dewitt Help needed
Thread Starter
Racer
Joined: Jul 2015
Posts: 396
Likes: 101
From: Lehigh Valley Pennsylvania
Tom Dewitt Help needed
Tom, I wiped out my radiator on my 73 BB corvette and I am considering upgrading to a Dewitt with fans. With the AC on and idling at 700 RPM the car will overheat with the original radiator and a generic 6 blade fan and fan clutch. The seals are all in-place and are new.
Questions
1. Can you tell me the air flow of the original 7 blade mech fan at 700 RPM?
2. How does this compare with the twin SPAL setup's air flow?
3. It appears the SPAL fans have a 2780 CFM flow. This appears to be the equivalent of a 10 MPH wind flow though my old radiator. Since the electric fans are a constant speed, do they provide any benefit when the car is moving over about 10 to 20 MPH?
4. I had the old brass/copper radiator. DeWitt offers two Aluminum radiators, a 1" wide tube radiator and a 1-1/4" wide tube radiator. Can you tell me the heat transfer efficiency differences between the three?
5. From all the posts I read here, it appears you major competition is Champion. How does your heat transfer compare to theirs?
6. From time to time DeWitt has a 15% off sale. Can you leak that date? Pun intended.
Thanks in advance for any help you can provide.
Questions
1. Can you tell me the air flow of the original 7 blade mech fan at 700 RPM?
2. How does this compare with the twin SPAL setup's air flow?
3. It appears the SPAL fans have a 2780 CFM flow. This appears to be the equivalent of a 10 MPH wind flow though my old radiator. Since the electric fans are a constant speed, do they provide any benefit when the car is moving over about 10 to 20 MPH?
4. I had the old brass/copper radiator. DeWitt offers two Aluminum radiators, a 1" wide tube radiator and a 1-1/4" wide tube radiator. Can you tell me the heat transfer efficiency differences between the three?
5. From all the posts I read here, it appears you major competition is Champion. How does your heat transfer compare to theirs?
6. From time to time DeWitt has a 15% off sale. Can you leak that date? Pun intended.
Thanks in advance for any help you can provide.
Burning Brakes
Joined: Nov 2005
Posts: 1,062
Likes: 44
From: flemington n.j.
Tom, I wiped out my radiator on my 73 BB corvette and I am considering upgrading to a Dewitt with fans. With the AC on and idling at 700 RPM the car will overheat with the original radiator and a generic 6 blade fan and fan clutch. The seals are all in-place and are new.
Questions
1. Can you tell me the air flow of the original 7 blade mech fan at 700 RPM?
2. How does this compare with the twin SPAL setup's air flow?
3. It appears the SPAL fans have a 2780 CFM flow. This appears to be the equivalent of a 10 MPH wind flow though my old radiator. Since the electric fans are a constant speed, do they provide any benefit when the car is moving over about 10 to 20 MPH?
4. I had the old brass/copper radiator. DeWitt offers two Aluminum radiators, a 1" wide tube radiator and a 1-1/4" wide tube radiator. Can you tell me the heat transfer efficiency differences between the three?
5. From all the posts I read here, it appears you major competition is Champion. How does your heat transfer compare to theirs?
6. From time to time DeWitt has a 15% off sale. Can you leak that date? Pun intended.
Thanks in advance for any help you can provide.
Questions
1. Can you tell me the air flow of the original 7 blade mech fan at 700 RPM?
2. How does this compare with the twin SPAL setup's air flow?
3. It appears the SPAL fans have a 2780 CFM flow. This appears to be the equivalent of a 10 MPH wind flow though my old radiator. Since the electric fans are a constant speed, do they provide any benefit when the car is moving over about 10 to 20 MPH?
4. I had the old brass/copper radiator. DeWitt offers two Aluminum radiators, a 1" wide tube radiator and a 1-1/4" wide tube radiator. Can you tell me the heat transfer efficiency differences between the three?
5. From all the posts I read here, it appears you major competition is Champion. How does your heat transfer compare to theirs?
6. From time to time DeWitt has a 15% off sale. Can you leak that date? Pun intended.
Thanks in advance for any help you can provide.
Le Mans Master
Joined: Jan 2000
Posts: 6,298
Likes: 416
From: Michigan
