docjim Posted May 19, 2013 Share Posted May 19, 2013 First, thanks to all who have answered my other questions. You've been very helpful. Now, my quandry: I have a 260Z into which is transplanted a 375 Hp/350 cid motor. I've got a JTR radiator and an off-brand cooling fan about which I know nothing. The fan draws 15 amps. Do you think it will be sufficient for a street machine in Phoenix, or do I need to pull it and find a Taurus fan? Thanks, Jim Quote Link to comment Share on other sites More sharing options...
Miles Posted May 19, 2013 Share Posted May 19, 2013 Within the last year there was an extensive dicussion in a thread concerning radiator and fan choices. Look for that thread. BTW, fans are rated in Cubic Feet per Minute (CFM). High CFM fans also draw higher amperage which can be a problem for old electrical systems (melt down). So you have to balance your choice of radiator and fan combinations. Suggest you do the following: - Search and read all threads dealing with radiator and fan choices. Become informed before choosing a radiator-fan set up. - Since you are in Arizona search the Arizona Z car website and check out the Z radiator. Check which fan is recommended for that radiator. Quote Link to comment Share on other sites More sharing options...
docjim Posted May 20, 2013 Author Share Posted May 20, 2013 I've been reading specs on various fans. It seems that most 2500 cfm fans draw about 19 amps, so I would guess that the existing fan is 2000-2300 cfm. That might be enough since I don't have A/C. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted May 20, 2013 Share Posted May 20, 2013 (edited) That should be fine. As long as you aren't going crazy and just city driving when it's 110* out. A fan shroud does wonders as well. Edited May 20, 2013 by BluDestiny Quote Link to comment Share on other sites More sharing options...
jhm Posted May 21, 2013 Share Posted May 21, 2013 In addition to a fan shroud, you'll need to pay attention to sealing the front end of your car (i.e. the space between your front grill and the radiator). This will ensure that all the air goes through your radiator. Good luck with it. Quote Link to comment Share on other sites More sharing options...
78zstyle Posted May 21, 2013 Share Posted May 21, 2013 In addition to a fan shroud, you'll need to pay attention to sealing the front end of your car (i.e. the space between your front grill and the radiator). This will ensure that all the air goes through your radiator. Good luck with it. Can you elaborate? Quote Link to comment Share on other sites More sharing options...
jhm Posted May 22, 2013 Share Posted May 22, 2013 Read this: http://forums.hybridz.org/topic/56254-after-doing-some-reading-i-blocked-off-the-upper-grill-pics/ There's a bunch of info on this topic scattered throughout the various sub-forums. Search on topics like "engine running hot" and "cooling problems" and you'll ferret out most of it. Good luck and happy motoring. Quote Link to comment Share on other sites More sharing options...
scott Posted May 22, 2013 Share Posted May 22, 2013 One of the challenges with cooling in a 240Z or 260Z is getting rid of the heat and air trapped inside the engine compartment (hood louvers or 280Z vented hoods can help). The airflow into the engine compartment creates backpressure on the fan. A fan with a 2500cfm rating is moving that air at zero back pressure. As back pressure builds, the fan airflow drops off dramatically (check out some fan curves). It takes a fan with a strong motor to keep good airflow (cfm) with backpressure created in the engine compartment, usually a fan with 20+ amps. The Taurus fans can pull around 35 amps. I am experiencing a similar problem on my two fan set-up. The fans aren't very strong and don't move enough air on hot days in stop and go traffic (they look good though). I don't have a vented hood, so the engine compartment builds some backpressure and traps heat. It is in traffic, traveling at low speed that the fans get the most workout. At highway speeds, the air is being rammed through the radiator, so cooling system capacity is now the important factor. My little fans were rated at around 8 amps, so they are not strong enough. I am now looking for more powerful fans. Quote Link to comment Share on other sites More sharing options...
SUNNY Z Posted May 23, 2013 Share Posted May 23, 2013 I was seeing 50A on my taurus fan when it was kicking on. I had to run two 30A fuses in parallel, with 10ga wire to compensate. Just an FYI, it DOES suck some juice, but I've driven my car in 100+ degree heat, and DRIVEN it, not just putted around. I do have the radiator and fan well sealed, but lack any front end mods to channel air. Quote Link to comment Share on other sites More sharing options...
Bowtiez Posted June 11, 2013 Share Posted June 11, 2013 (edited) I just added an Edelbrock roots type supercharger and noticed that I gained about 20 degrees. I am using a Griffin 26 X 19 radiator and Permacool 14 inch 2950 CFM fan with a 195 degree thermostate. I am moving the puller fan to the lower left corner, adding a pusher 14 inch fan to upper right and changing the thermostat to a 180 degree. Hopefully this get things back to normal. If so, I am going to put lighter and smaller 2200 7 inch permacool fan as a puller. The JTR set back position made a big difference even for road racing. I have louvers in both the hood and inspection panels. Edited June 11, 2013 by Bowtiez Quote Link to comment Share on other sites More sharing options...
EngineeringPerformance Posted February 9, 2014 Share Posted February 9, 2014 Hey Sunny, I've in the market to buy a better cooling fan for my project car. Have you heard about the Delta PAG Brushless fan? I know brushless motors and they are by far more advanced and efficint than brushed motors. Has anyone on this forum installed one of these brushless fans? Quote Link to comment Share on other sites More sharing options...
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