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Thermostats

Old 02-15-2020, 08:16 AM
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Default Thermostats

Has anybody run their 502 EFI Mags with the thermostat removed? If so what effect did it have?
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Old 02-15-2020, 08:29 AM
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For what reason would you want to ?
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Old 02-15-2020, 08:39 AM
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I removed them for winterizing and I was just wondering.
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Old 02-15-2020, 09:04 AM
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Its important that an engine gets up to the proper temp to run its best , this EFI engine is designed to run a stat, Id put new ones back in
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Old 02-15-2020, 09:30 AM
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Like it was stated by f2 I would highly recommend putting them back to make sure motor runs at the optimal performance. Running no t stats could be a bigger issue due to temps.
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Old 02-15-2020, 01:31 PM
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Reduced water pressure in intake may cause steam pockets in heads. More heat . Boom
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Old 02-15-2020, 05:06 PM
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the coolant temp is one of the inputs to the ecm for the ecm outputs to command fuel injector pulse widths. The fuel table mapping will be rich. for a jist of info.
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Old 02-16-2020, 10:10 AM
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fyi,,,my old set up had no thermostats,, but after i changed some things added 160's.
as said , u want the temp 160 plus....
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Old 02-16-2020, 11:27 AM
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and for more info most other engine brands of efi / mpi engines guardian the rpms when the engine does not see min of 140 to 142 coolant temp. With that said for people that have went from a 160 T stat to a 140 T stat that would not work out so great for those owners.

Also no matter of engine brand a fully stuck open T stat will make the engine run rich. Even 4 stroke outboards and they will make oil.
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Old 02-16-2020, 12:08 PM
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Bup, what is normal operating range for 502Mag/EFI? How high is considered problem? Mine varies a lot with ambient and lake temp.
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