Cooling Question - ZR-1 Net Registry Forums

XfireZ51 · 10-21-2016

Ok, last year I installed a Fluidyne rad to keep temps down particularly when in traffic w A/C on. Worked great have however, with ambient temps below 60, it was difficult to maintain operating temps on motor. At cruise, coolant temps would drop into the 150-160 range. Which is not desired if you want Closed Loop operation w Learn Control. So I finally bought a stock therm from Jerry's and had it installed. turns out the thermo coming OUT of the motor had 5 holes drilled in it. The stock thermo was installed w 0 holes.
The result is that coolant temps increase now unless motor is turning above 12-1300 rpm. That includes at highway cruise. So I know I don't need 5 holes in thermo, but I'd like to avoid doing this again. How many holes should I put in stock thermo so that fans can maintain steady operating temps?
I should add that I have under drive pulleys and temps creep up they don't shoot up.

10-21-2016	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,669	Cooling Question Ok, last year I installed a Fluidyne rad to keep temps down particularly when in traffic w A/C on. Worked great have however, with ambient temps below 60, it was difficult to maintain operating temps on motor. At cruise, coolant temps would drop into the 150-160 range. Which is not desired if you want Closed Loop operation w Learn Control. So I finally bought a stock therm from Jerry's and had it installed. turns out the thermo coming OUT of the motor had 5 holes drilled in it. The stock thermo was installed w 0 holes. The result is that coolant temps increase now unless motor is turning above 12-1300 rpm. That includes at highway cruise. So I know I don't need 5 holes in thermo, but I'd like to avoid doing this again. How many holes should I put in stock thermo so that fans can maintain steady operating temps? I should add that I have under drive pulleys and temps creep up they don't shoot up. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 10-21-2016 at 05:06 PM.