Thread: Electric fan control

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Don

my info and comments were for vehicles in general---your open car with open engine will not have airflow problems like a closed car--in a closed car such as rogers, the air doesn't flow thru the radiator because it can't exit the confined places under the hood--if the air can't get out, it can't get in(thru the radiator) needs lots of louvers---but they don't do them in glass bodies

Yeah, I know that cars like 40 Fords can have an issue with that...........what is it called, air reversion, or something similar. The air can't escape so new air goes around the radiator instead of through it.

Last night Don and I were working on his car and he said he just saw where some guys on a TV show were talking about how they punched holes in their fan shrouds to allow air to pass through when going down the road. Supposedly it cured a run warm condition that they had previously experienced. I guess that could be true also because one radiator setup I bought had rubber flaps over some holes in the shroud to allow air to escape while driving, but they would suck shut when the fan came on.

We are going to pull out Dons shroud and holesaw some holes into each corner to see if his T will run cooler going down the road.

Don

Originally Posted by Itoldyouso

Last night Don and I were working on his car and he said he just saw where some guys on a TV show were talking about how they punched holes in their fan shrouds to allow air to pass through when going down the road. Supposedly it cured a run warm condition that they had previously experienced. I guess that could be true also because one radiator setup I bought had rubber flaps over some holes in the shroud to allow air to escape while driving, but they would suck shut when the fan came on.

We are going to pull out Dons shroud and holesaw some holes into each corner to see if his T will run cooler going down the road.

Don

my cooling components shroud has the rubber flaps. I never really gave it much thought, but that makes sense.

Originally Posted by jerry clayton

Don
my info and comments were for vehicles in general---your open car with open engine will not have airflow problems like a closed car--in a closed car such as rogers, the air doesn't flow thru the radiator because it can't exit the confined places under the hood--if the air can't get out, it can't get in(thru the radiator) needs lots of louvers---but they don't do them in glass bodies

Mine is pretty open, Jerry, running a solid hood top but no sides. I don't trap much air behind the radiator

Originally Posted by jerry clayton

However---In Rogers world he will have overheated his system before RECOVERY begins and in my system, I keep the ENGINE temps where I want them.(Unless in either case there is a failure somewhere)

Regarding overheating, it's all a matter of selecting the right set points and the point at which you define "overheating", right Jerry? My fan on set point is going to be set slightly above my t-stat setting so I'm not running the fan when my t-stat is controlling to set point, with the high speed on set some span above that based on the cooling capacity of the radiator. Your fan on set point is going to be set at a lower temperature than mine, based on the known/expected heat pickup in the engine. Once adjusted both setups will work just fine, IMO, and neither will allow anything to overheat in normal situations.

...but living in Florida with our heat and humidity, we don't take anything for granted.............even the best engineered cars will run hot down here sometimes.
Don

Man is that right! I learned quick lessons when I migrated down to the gulf coast in the USN years ago with my old '60 chevy. Learned the need for a clean system and a good t-stat pretty quick!!