Quote:
Originally Posted by Frank Lee
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Yeah I saw Darin's data, but I knew mine took much longer to warm up. It's pretty much a matter of scale. He was using a 800W heater on a 1 liter engine. I'm using a 750W heater on a 6.7L engine that weighs over half a ton. Plus his was a circulating heater, which is better than my immersion heater, which I don't think leads to much circulation.
Granted the block heater is there for a starting aid and it looks like it's sufficient for that. If you can get a 60 deg F temperature rise from ambient, then -40 F goes to +20 F. In addition, my truck has the intake grid heater for the air. So if you're just worried about getting it started, the 750W heater looks like it'll do the job.