skipjobe Posted June 21, 2008 Share Posted June 21, 2008 260Z is almost finished. Problems Heating issue; I bought the car from a neighbor that moved on to work on his Cobra Kit. There were two small electric fans installed .I bought an aluminum radiator 1 1/2 thick and fabricated a new cowl and added a 16" 3000 cfm fan. It runs hot at freeway speeds but will cool off when I slow down to city speeds, I installed a manual switch and a 160 deg thermostat. I added an aluminum shield from the spoiler to the crossmember and am planing to box the top and sides to force more air through the radiator. I have a 8x12 trans cooler in front of the ac condenser. maybe that is bad.The car has ac but that is out of the question at this point. I bought a mechanical fan and clutch but the cowl fabrication was more that I think I can handle. I read the posts on heating issues but have not found a solution for this Texas heat. Is a mechanical fan a likely solution or do I need to add more radiator? I owned a stock 72 and it would get hot if I tried to keep it above 115 mph. I have some other issues but will save them for another post. Quote Link to comment Share on other sites More sharing options...
skipjobe Posted June 21, 2008 Author Share Posted June 21, 2008 260Z is almost finished. Problems Heating issue; I bought the car from a neighbor that moved on to work on his Cobra Kit. There were two small electric fans installed .I bought an aluminum radiator 1 1/2 thick and fabricated a new cowl and added a 16" 3000 cfm fan. It runs hot at freeway speeds but will cool off when I slow down to city speeds, I installed a manual switch and a 160 deg thermostat. I added an aluminum shield from the spoiler to the crossmember and am planing to box the top and sides to force more air through the radiator. I have a 8x12 trans cooler in front of the ac condenser. maybe that is bad.The car has ac but that is out of the question at this point. I bought a mechanical fan and clutch but the cowl fabrication was more that I think I can handle. I read the posts on heating issues but have not found a solution for this Texas heat. Is a mechanical fan a likely solution or do I need to add more radiator? I owned a stock 72 and it would get hot if I tried to keep it above 115 mph. I have some other issues but will save them for another post. I found a Thread that seams to indicate that closing in the area around the frontal area to force more air through the radiator seems to be the logical next step. Quote Link to comment Share on other sites More sharing options...
HICKL Posted June 25, 2008 Share Posted June 25, 2008 Your In conroe? Bring that thing over. Is your tuning right on your motor, ignition timing etc? If your not using your ac, pull that condensor for sure. Made a big difference on my car. Jeff Quote Link to comment Share on other sites More sharing options...
Phantom Posted June 25, 2008 Share Posted June 25, 2008 If you don't have a fan shroud then there is a significant part of your problem. I'm running a stock 280Z radiator recored to 4 rows from 3. I have AC and it worked fine for years in the DFW area. Even with only one of the two fans running it didn't overheat on 100°F days with the AC running flat out in stop & go driving. It ran even cooler if I could get up above 35 MPH. How thick your radiator is doesn't mean a lot. How many rows, the fin density, and the tube diameter is what matters. How did you determine which radiator to buy? Closing in the gap is not necessary if you have the right radiator and fan combination. It is a band aid. Quote Link to comment Share on other sites More sharing options...
texis30O Posted June 25, 2008 Share Posted June 25, 2008 I am down the road in Humble...I would like to see it as well. I am ordering a few goodies for my car and want to meet up with some North-siders soon.... Quote Link to comment Share on other sites More sharing options...
Slow_Old_Car Posted June 25, 2008 Share Posted June 25, 2008 Sounds like we need to organize a meet to me. Or a track day. Or both. There is a meet on Saturday nights that is comprised solely of classic cars from all around Houston, takes place in NW Houston. That could be fun. Quote Link to comment Share on other sites More sharing options...
HICKL Posted June 25, 2008 Share Posted June 25, 2008 I work in Humble so my Z travels between the two cities quite often. Sorry skipjobe if we are ruining your thread... Quote Link to comment Share on other sites More sharing options...
skipjobe Posted June 26, 2008 Author Share Posted June 26, 2008 I had no idea that there were that many Hybrid Z's in this area. I would really like to see your cars and compare notes. I'll send each of you a PM. I fabricated an aluminum cowl 2" thick sealed to the radiator. I just finished building an air box to channel more air to the radiator. I don't have a front bumper I wonder if that has a negative effect on the aerodynamics. Quote Link to comment Share on other sites More sharing options...
HICKL Posted June 26, 2008 Share Posted June 26, 2008 I had no idea that there were that many Hybrid Z's in this area. I would really like to see your cars and compare notes. I'll send each of you a PM. I fabricated an aluminum cowl 2" thick sealed to the radiator. I just finished building an air box to channel more air to the radiator. I don't have a front bumper I wonder if that has a negative effect on the aerodynamics. I very seldom run my front bumper. Can't see that causing a problem. Jeff Quote Link to comment Share on other sites More sharing options...
mark Posted June 26, 2008 Share Posted June 26, 2008 How hot is hot? Are you using the stock gauge? Quote Link to comment Share on other sites More sharing options...
skipjobe Posted June 26, 2008 Author Share Posted June 26, 2008 The radiator has 2-1" cores 19x22 I should have bought 24x19 but the experts say that should be adequate. Quote Link to comment Share on other sites More sharing options...
skipjobe Posted June 26, 2008 Author Share Posted June 26, 2008 Yes, I am using the stock gauge and it runs 185 to 190 up to 50 or 55 at 75 it will go to 240 Quote Link to comment Share on other sites More sharing options...
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