Posted by NCWayne on February 01, 2012 at 18:02:33 from (69.40.232.132):
In Reply to: Thermostart question posted by osterbur on February 01, 2012 at 17:23:47:
The type of element your talking about is actually considered a 'flame start' element. In other words the element heats and in turn opens a valve allowing fuel to be sprayed on the hot element thereby producing a flame that warms the air going to the cylinders. That being the case the element needs to be shut off once the engine is running. As far as allowing it to heat up prior to starting, it only takes a second or two for one to heat up and be glowing red once power is supplied so the thirty seconds your talking about isn't really needed with this type of heater.
Now if it's one of the ones without a fuel line it's a straight intake heater so it isn't designed to produce a flame to warm the air. In that case it does need to be powered for 30 seconds to possibly even a minute before starting in order to warm the intake air enough to do any good. The same holds true for glow plugs on most engines. Some of the newer ones even keep the intake heater or glow plugs powered for a time after the engine starts just to assist with firing the fuel in the name of reducing emissions from unburned fuel caused by a cold engine. Hope this all answers your questions.
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