smidee 10 Report post Posted January 16, 2021 i have a 357 long rod,2v small chamber heads, small cam,not a big hp engine but just warm, and yes the right thermostat at 180 deg ,2500 stall, hyper spark and sniper setup and ac i cant seem to stop heat creep at idle its not timing tried that. i have a new 24"x16" 3 core rad with 5/8 tubes, shroud and steel blade fan,which i replaced the 4 core one with, i took off the Elec fan and shroud it was too shallow as it was blocking the radiator air flow now i cools just fine at speed as long as I'm moving but at idle it starts to creep if the ac is on . ,here is the spec from my repair manual should i be trying to run in these temp ranges maybe i go to a 190 deg thermo and take out the 180 as it would be running flat out all the time Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted January 16, 2021 Engine temps rising at idle is usually a symptom of insufficient air flow through the radiator. What type of mechanical fan setup does it have? Quote Share this post Link to post Share on other sites
smidee 10 Report post Posted January 16, 2021 stock steel blade and shroud Quote Share this post Link to post Share on other sites
aslanefe 333 Report post Posted January 16, 2021 What temp are you seeing? Are you measuring the temp with a laser thermometer etc or looking at the stock temp gauge? Quote Share this post Link to post Share on other sites
smidee 10 Report post Posted January 16, 2021 using both my stock one and the digital sniper one also using laser to check, the sniper readout is the one i use mostly ,once it gets hot say 200 ish it puts my analogue one at just past half way 206-212 its at about 3/4 on gauge . I am toying with the idea of a hi flow thermo stat either 180 -190, the fans I don't know i need a shrouded one electric maybe, the one i had the shroud was too shallow so couldnt pull enough air across the whole core and at speed would block air to the core Quote Share this post Link to post Share on other sites
unilec 57 Report post Posted January 16, 2021 The thermostat is there to reduce water flow though your radiator to help get the engine up to temperature quicker, once fully open say about 180 F, it serves no further need. First thing to check would be your timing, but temps of 195 to 205 F are normal. More damage is done to an engine running at to low a temperature. 2 Shep69 and Dave R. reacted to this Quote Share this post Link to post Share on other sites
aslanefe 333 Report post Posted January 16, 2021 Where did you put Sniper temp sensor, can you post a picture? Are you using the sensor that came with Sniper? I tested the Sniper sensor with a laser and found it to be not reading right, so I replaced it with Delphi TS10075. Quote Share this post Link to post Share on other sites
smidee 10 Report post Posted January 16, 2021 in the block tested mine seems to be pretty close Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted January 17, 2021 21 hours ago, smidee said: stock steel blade and shroud Is the fan a reproduction 5 blade fan? I originally had that type on my 1969 Mach 1 with a 351W and it didn't move much air, especially at idle. I found a stock 6 blade clutch fan from a 1969 Cougar with a 351W and installed it with a new Hayden clutch. It works much better. Quote Share this post Link to post Share on other sites
Dave R. 85 Report post Posted January 17, 2021 Is the motor fresh? A newly rebuilt motor is tight and makes more heat. Like the suggestion of checking the timing. The proper fan, fan clutch and shroud are important. The fan blades should be no more than halfway behind the edge of the shroud. Dave R. Quote Share this post Link to post Share on other sites
Midlife 814 Report post Posted January 17, 2021 When the heat is on here in Tucson, lots of creeps idle around open bedroom windows...just saying... 1 2 Shep69, Mach1 Driver and Dave R. reacted to this Quote Share this post Link to post Share on other sites
smidee 10 Report post Posted January 17, 2021 3 hours ago, 1969_Mach1 said: Is the fan a reproduction 5 blade fan? I originally had that type on my 1969 Mach 1 with a 351W and it didn't move much air, especially at idle. I found a stock 6 blade clutch fan from a 1969 Cougar with a 351W and installed it with a new Hayden clutch. It works much better. no its a factory ford one for my 70 i am putting the thermo back on but have boxed the shroud to give it more clearance from the core and using a ford factory single fan from a falcon or territory it move a shit load of air see if that makes a difference 2 hours ago, Midlife said: When the heat is on here in Tucson, lots of creeps idle around open bedroom windows...just saying... thats the least of americas problems atm Quote Share this post Link to post Share on other sites
Mach1 Driver 560 Report post Posted January 17, 2021 maybe this will help: Quote Share this post Link to post Share on other sites
danno 128 Report post Posted January 18, 2021 I have the same problem when the AC is on and stuck in slow traffic. I am going to try the 6 blade fan as suggested in the West Coast Cougar video. Quote Share this post Link to post Share on other sites
smidee 10 Report post Posted January 18, 2021 let me know how it goes as i will have to change my shroud and fan Quote Share this post Link to post Share on other sites
danno 128 Report post Posted January 18, 2021 The trouble is, I live in Minnesota. I will not know if it works until July.... Quote Share this post Link to post Share on other sites
