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Shadetree Mechanic
Joined: Fri Oct 27th, 2017
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1st post, 17th photo down.. Unless Safari Snorkels did an actual design change I'm unaware of, your buddy in the 3rd Gen 4Runner there has his snorkel inlet on backwards.. Not sure if it was temporary in use that way or not but just for the information being available.
All Air Ram inlet hoods MUST be installed with the screen facing forward to ensure best performance. Airflow restriction will not be reduced if the Air Ram faces sideways; but if it faces backwards, restriction does increase and adversely affects engine performance.
This off the Airflow site.....
In the case of the air ram being turned away from the direction of travel the result is lessening of the positive pressure that is desirable. In the extreme, a vacuum is caused (i.e. turning the air ram backwards which may cause engine damage and should only be used over short distances).
This off the Donaldson site....
All Air Ram inlet hoods MUST be installed with the screen facing forward to ensure best performance. Airflow restriction will not be reduced if the Air Ram faces sideways; but if it faces backwards, restriction does increase and adversely affects engine performance.
But then this off the Safari site....
By rotating the air ram to face away from the prevailing wind/direction of motion, the air ram delivers additional protection from the choking effects of snow build-up inside the air intake.
If the concern is dirt or mud being ingested, a pre cleaner would suit better unless raining, then I'd remove it and have just the snorkel head. Everyone is forgets what causes the air to go into the snorkel as it is air pressure and not air speed.
Now there is the case of if the snorkel was high enough to be out of the pressure caused by the vehicle moving forward, then forward facing would CERTAINLY be needed or you'd have a case or turbulent air behind the snorkel and no airflow at all and in this case if it was sideways the air would be sucked out of the snorkel...
He probably just had the inlet on backwards, to be honest.
I believe the snorkel was on it when he bought it.
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2002 XLT 4x4, 4.0l V6, Silver Frost Metalic, Superlifted and stuff