placing a cover over the radiator before starting so that engine coolant can warm up

[KICK]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

I believe all water cooled engines have a built in bypass.

can you imagine a hydraulic system ( cooling system is hydraulic in a primitive way) that didn't have a way for the liquid to flow if something was blocked. somehing would have to give.

bypass allows warm coolant to recirculate thru block to allow faster warmup and de-aereate system.

 

[TMcD_in_MI]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

I believe all water cooled engines have a built in bypass.

can you imagine a hydraulic system ( cooling system is hydraulic in a primitive way) that didn't have a way for the liquid to flow if something was blocked. somehing would have to give.

Not really an issue with the cooling system, though, since the pump isn't a positive dislacement pump.

Tom

 

[Dusty]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

Every thermostat that I have ever seen has a 1/8" hole in it to allow for some circulation. Some engines use a water bypass hose from the water pump to the intake manifold. I have seen this on a lot of older Chrysler & Buick engines. The cars heater is also taken off the water pump and that allows circulation so the water pump isn't damaged until the thermostat opens. I don't believe that the shut off valve is totally closed when closed on these automobiles. The water pumps on tractors are probably built differently and don't move as much liquid.

 

[KICK]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

Not really an issue with the cooling system, though, since the pump isn't a positive dislacement pump.

Tom

no, but it would probably be **** on the drive belt

 

[Egon]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

Nope, with the type of pump the maximum power is required when the maximum flow rate is acheived and work is being done.

 

[gbick]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

Nope, with the type of pump the maximum power is required when the maximum flow rate is acheived and work is being done.

This is an interesting phenomenum. I remember my amazement when discovering that throttling the discharge of centrifugal pumps reduced power requirements. (back when the paper mill was running)

 

[jimmysisson]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

This is an interesting phenomenum. I remember my amazement when discovering that throttling the discharge of centrifugal pumps reduced power requirements. (back when the paper mill was running)

Same as putting your hand over the shop-vac nozzle. The motor sounds (to some humans) like it's straining, but it's just speeding up since there's less load, less air it can move.
Jim

 

[daTeacha]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

Getting back to engines, most cars with electric fans have them because they rob fewer hp than the belt driven variety. They also freewheel at higher speeds.

Regarding direct cooling of the block by air, my Passat 1.8t is a good example. When it's seriously cold, say -10 or less on the Fahrenheit scale, I can't rely on the heater to keep the car interior warm at highway speeds. The temp gauge will hit 190 with the heater turned down, but just turning the temperature up a bit too far or speeding up the heater fan will drop the engine temperature enough to show on the gauge and be felt on my wife's feet. If I stop and let it idle a while, everything warms up again.

 

[Richard]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

Related to your radiator question, but not as a tractor...

Years ago, I had a 1969 Mercedes 280SL (the old old OLD body style, but not the oldest bodystyle )

I was heading from Knoxville to Cincinnati, about a 4 1/2-5 hour trip and it was in the dead of winter.

In car, driving, heater on FULL blast. Of course, as I'd just started the car, I was seeing my breath while sitting inside. No problems...the car will warm up and make me warm soon.

By the time I drove to Lexington (3 hours away) I was STILL seeing my breath inside the car and freezing my TOOSH off.

I stopped to get gas and rummaged through their garbage can a bit to find a piece of cardboard.

I slapped that cardboard in front of the radiator and within 5 minutes, it was FINALLY nearing "warm" inside the car.

I guess it had a small engine, big radiator and aluminum engine... all helping to take the heat out of the fire.

My only regret was waiting until I got to Lexington to fill up with gas.

 

[Dusty]

Re: placing a cover over the radiator before starting so that engine coolant can warm up

An automobile cooling system has to be large enough to remove the excess heat when the ambient temperatures are in the 90's and also be able to provide heat to the passenger compartment when the temperatures are in the 40's. Once you get outside of that operation range, then you have exceeded the original design parameters of the system and need to supplement the system by adding a blockage to keep more of the heat in the engine... i.e. installing a piece of cardboard. When the temperatures start to exceed the vehicles ability to remove the excess heat, that is a little more difficult to remedy, but turning off the air conditioning will help to reduce some of the under hood temperatures. Today, they add additional cooling fans to the vehicles. My Benz has a mechanical fan driven by a belt off the engine and two cooling fans mounted in front of the radiator that are temperature activated.
Dusty