Fan Shroud Air flow, related to othe thread: lower flap Options

[ndfrigi]

Related to a sale thread about Metal flaps on the lower fan shroud. Since that thread is about selling that item, I will just make this new thread about the air flow of the fan shroud.

I am also interested if someone can give us direct explanation about closing that lower air vent of the fan shroud when no HE is in place.

When that lower air vent of the fan shroud is totally closed/plugged:
- Driver side cooling flap is almost close while passenger side cooling flap will be open (which lessen or no air flow passing through the oil cooler) and assuming the spring thermostat is in place.

Question: Since the lower vent is closed, all the air from fan will force to flow in the engine even will small opening from the cooling flap (driver side). Is this can delay the normal engine temperature? Is this good or bad?


- When normal engine temperature is acquired, the driver side cooling flap will be in full open and have more air from the fan to flow on the engine, and the passenger side cooling flap will totally closed which make all the air flow goes through or pass the oil cooler. And again since the lower fan shroud vent is totally closed, all the air from the fan will pass the oil cooler because no air is coming out of the lower air vent. With this, I think it will help cooling the oil.

Thanks!





Below type of cooling fan housing:

It could be the same idea when original 914 fan shroud lower vent is totally closed/plugged. All air from the fan goes directly to the engine and exit through the oil cooler. Is it right?