Eric F
Active Member
70 Road Runner 383 .060 9.3 compression. Mopar aluminum water pump housing with 8 impeller water pump. 180 degree thermostat.
‘my car originally 22 inch 3 core radiator with a solid fan and shroud. When I put my car together after sitting apart for 27 years. The engine was rebuilt. I installed a Champion 22 inch 3 core radiator with a fan and shroud I also used a Hayden thermostatic fan clutch and 7 blade fan from a motorhome. First warn cruise night it got to 230 within 20-30 minutes. I pulled out of cruise night boom cools off to about 200 within 10-15 minutes of driving. I added a flex a light 1850 cfm pusher fan. It helped brought the temp down to about 225.
I then decided to try a 26 inch 2 core radiator also installed a fan shroud same fan and fan clutch. Note I did NOT cut the radiator opening as it is numbers matching car and a somewhat rare color. I found that the 2 core radiator and with the pusher fan it’ll maintain 220 in slow speed traffic on a night above 90 degrees. I had a mishap and the fan shroud came loose the fan hit the shroud destroyed the shroud, bent the fan. I took apart the cooling system I also found that the impeller slipped on the water pump shaft.so with the car apart I back flushed the block just for good measure. I had a hi flow water pump in my stash. Its a 440 source 40 gpm pump. I installed a solid fan I had laying around off a C body and installed my 22 inch 3 core radiator ( I flushed the radiator before installation) put it together. I started the car up was doing some testing and noted the solid fan has little are flow just wasn’t pulling much air. Ok. I ordered and Hayden fan clutch as mine might have been damaged I also ordered and installed a Derale 6 blade high cfm fan blade. Got the car running and noticed quite a bit of air flow. Great. Took it around town and did good but outside temp was around 60 degrees.
yesterday was an above 70 degree day and took the car out for the day. I noticed driving speed about 15-20 mph and above the car runs and stay around 180-185 perfect. Went through town and got up to 225 because I was going 10 miles an hour. And I was creeping to the 230 mark.
im puzzled at why my can maintain better cooling temps with a 26 inch 2 core radiator with 4 inches of core blocked than a 3 core 22 inch radiator. Possible there are too many cooling tubes and there is not enough air flow past the tubes?
‘my car originally 22 inch 3 core radiator with a solid fan and shroud. When I put my car together after sitting apart for 27 years. The engine was rebuilt. I installed a Champion 22 inch 3 core radiator with a fan and shroud I also used a Hayden thermostatic fan clutch and 7 blade fan from a motorhome. First warn cruise night it got to 230 within 20-30 minutes. I pulled out of cruise night boom cools off to about 200 within 10-15 minutes of driving. I added a flex a light 1850 cfm pusher fan. It helped brought the temp down to about 225.
I then decided to try a 26 inch 2 core radiator also installed a fan shroud same fan and fan clutch. Note I did NOT cut the radiator opening as it is numbers matching car and a somewhat rare color. I found that the 2 core radiator and with the pusher fan it’ll maintain 220 in slow speed traffic on a night above 90 degrees. I had a mishap and the fan shroud came loose the fan hit the shroud destroyed the shroud, bent the fan. I took apart the cooling system I also found that the impeller slipped on the water pump shaft.so with the car apart I back flushed the block just for good measure. I had a hi flow water pump in my stash. Its a 440 source 40 gpm pump. I installed a solid fan I had laying around off a C body and installed my 22 inch 3 core radiator ( I flushed the radiator before installation) put it together. I started the car up was doing some testing and noted the solid fan has little are flow just wasn’t pulling much air. Ok. I ordered and Hayden fan clutch as mine might have been damaged I also ordered and installed a Derale 6 blade high cfm fan blade. Got the car running and noticed quite a bit of air flow. Great. Took it around town and did good but outside temp was around 60 degrees.
yesterday was an above 70 degree day and took the car out for the day. I noticed driving speed about 15-20 mph and above the car runs and stay around 180-185 perfect. Went through town and got up to 225 because I was going 10 miles an hour. And I was creeping to the 230 mark.
im puzzled at why my can maintain better cooling temps with a 26 inch 2 core radiator with 4 inches of core blocked than a 3 core 22 inch radiator. Possible there are too many cooling tubes and there is not enough air flow past the tubes?
