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Old 01-18-2012, 12:20 PM
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Originally Posted by Blown496
Is the temp sensor in the head or intake? Fan sensor in head or intake? I have my fan sensor in the aluminum head at 195 and the temp sensor in the intake. Blown 496 with Griffin 1 1/2 tube radiator. One pusher fan in front and a fixed performance fan on engine. Runs 185 in traffic and 180 at speed. fan never comes on until I idle a lot or after shut off. I run a high flow tstat with relief hole and high flow Eddy pump. Timing is 16 at 1000 and 32 total. If it heats at speed it is air flow and/or timing. You said plugs don't look lean. Is the shroud flush against the radiator?
After reading through all the replies I was wondering when someone was going to ask where the fan temp sensor and engine gauge sensors were!
There are huge differences between a sensor that picks up in the cooling fins of the radiator, and also between aluminum heads and a cast iron block, or intake sensor.
The best place to install the fan sensor is the aluminum heads since they heat up way faster than anything else, and the best place to monitor engine temp is in the intake, as that's the return temp on a Chevy engine.

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  #32 (permalink)  
Old 01-18-2012, 07:16 PM
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Quote:
Originally Posted by 1971BB427
After reading through all the replies I was wondering when someone was going to ask where the fan temp sensor and engine gauge sensors were!
There are huge differences between a sensor that picks up in the cooling fins of the radiator, and also between aluminum heads and a cast iron block, or intake sensor.
The best place to install the fan sensor is the aluminum heads since they heat up way faster than anything else, and the best place to monitor engine temp is in the intake, as that's the return temp on a Chevy engine.
The temp gauge sensor has always been at the front of the intake. Once the car reaches 190 I turn the fans on and leave them on. There is no threaded hole for my fan sensor on my aluminum heads, so I just put it on a switch.
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Old 01-20-2012, 06:41 PM
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I use the flexalite controller and I am happy with it. I can control what temp the fans come on and can overide with switch also the come on 60 percent then go to 100 percent as the engine heats up. I think I agree with lean cruise too. I have a 496 with a pusher and puller but the fans do cool it. Good luck
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