keeping a 416 cool

[2ss black]

how is everyone keeping there 416 cool when stop at a light my temp go up to 221 or higher new 3 row radiator no thermostat and i'm still overheating help

[Clarkstar]

Something isn't right. It shouldn't run any hotter than the factory motor....

I seen no difference in temp with my 416...

[1fast]

You might want to put thermostat back in slow flow down
All air purged outta system

[xc_SS/RS]

Did you fill the coolant from the upper hose? If not you might have air in the system

[blue-bayou]

Some engines will have a tendency to overheat at idle without a thermostat

[gtstorey]

Originally Posted by 1fast

You might want to put thermostat back in slow flow down
All air purged outta system

Velocity Affects Thermal Transfer

Often less understood, is the effect of velocity on the thermal transfer characteristics of the heat exchanger: It turns out that the higher the velocity through the heat exchanger, the higher the turbulence — and the higher the turbulence, the more efficient the thermal transfer.
You may be wondering how that can be. The answer lies in the turbulence of the flow.
You’ll recall that turbulent flow creates a great deal of disturbance along the flow path. This turbulence forces the fluid against the walls of the heat exchanger and increases the friction between the fluid and the surface.
The turbulence constantly pushes fresh fluid against the metal wall, and the greater the volume of fluid in contact with the walls of the heat exchanger, the greater the thermal transfer.
The opposite of turbulent flow is “laminar flow,” which you may also recall is defined as a smooth, linear flow through the system. As turbulence falls, the film on the walls of the heat exchanger increases. Called the “film coefficient,” as it increases, the thermal transfer efficiency is reduced.

[MPrento84]

pretty sure 221 is not overheating

[hammdo]

Strokers heat more. Mine is a 416 stroker...

I run a 90/10 distilled/coolant/water wetter mix, mechanical and electric water pump. She’ll get up to 220 with a long idling stop on at 100+° day here in Texas.

I have 3 hxs, oil, ps, and trans cooler in front of the ac condenser/radiator too.

Most of the time, mine runs fine and does not get over 208°.

160° degree thermostat, supercharged and, hood vented.

Manages very well...

-Don

[hazy]

so I recently had a procharger installed on my 416

had insane cooling issues.

Turns out that my passenger side radiator fan had gone bad. temps would be "ok" while driving, but would scream up quickly if idling at a light

Might wanna just pull the connector to your fans and hit them w some 12 volt power to test that they're both functioning. 260 bucks and about an hour and a half was all it took to resolve, and my temps are back down in the normal ranges.

Older cars now, things have a way of failing as they age sometimes

[Bo White]

My stock bottom end build is 12:1 with a 243/255-111 TSP cam. New water pump, new fans, new radiator. Biggest help was 160* Tstat. Both fans programmed to be on when I start the engine pretty much.

[Bo White]

When you run no Tstat you have the possibility to circulate the coolant so fast it doesnt stay in the radiator long enough to cool down enough.

[gtstorey]

Originally Posted by Bo White

When you run no Tstat you have the possibility to circulate the coolant so fast it doesnt stay in the radiator long enough to cool down enough.

I've heard that my whole life, but my admittedly short research into it in the engineering literature indicates that is not true. All I found was concern of erosion of the metal and pressure loss at you increase speeds, and I'm sure neither are within the speeds that we are talking about.

[2ss black]

thank everyone will put thermostat in and see what happen

[christianchevell]

yes the purging of the air is important with the front up and the cap off until warm..... Mine runs cool like stock and not my first built engine.