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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [xj-s] Re: Cooling at idle
At 14:41 29-07-98 -0400, Peter Cohen wrote: >I don't think so. Someone else opined that the problem was insufficient >coolant circulation at idle speeds. I tend to agree. After rodding out my >radiator, I find that the gauge will still creep up to the top of the 'N' >when sitting in traffic on a hot day. Ambient temperatures will continue to affect the cooling ability of your vehicle, moreso at idle when you have less airflow - your radiator is trying to exchange heat with air which is already warm and isn't moving away from the radiator fast enough to really have effect on the exchange. >Put the car in neutral, rev up the motor, and the temperature drops >immediately, then starts creeping up again. This tells me that the coolant >in the radiator is plenty cool, it just isn't moving through the motor in >sufficient volume to keep the temperature down. What happens when you revv up the motor? Well, assuming it is in fact warm, and the clutch fan is properly working, it is probably engaged, so what you're doing is increasing the airflow through the radiator. In other words, you're increasing the RADIATing flow of the RADIATor - more cooler air with which to come in contact with and put off heat into. Radiators do just that - radiate heat. Without something moving the heat away from it, it'll just build up. Lay a plastic bag on the front of your radiator and see how much the effectiveness drops -- because you're reducing the airflow. If you have an electric fan at home for cooling, I'm sure you've got multiple settings on it. Ever note how things seem to get cooler when you crank the fan way up instead of leaving it on LOW? More airflow = more capacity to exchange heat with cooler air (not necessarily COOL air, just COOLER air - and at operating engine temperature, the water will always be warmer than the ambient air temperatures). >IMHO, what we need is a smaller diameter water pump pulley, to run the pump >faster at a given engine speed. Which will in turn cause the water pump to spin even faster at higher rpms, which isn't necessarily a GoodThing(tm). --- <http://jaguar.professional.org/> Sean Straw '88 Jaguar XJSC 5.3L V12 Marin County, California '69 Buick GranSport 455 V8 References:
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