Project
Title: Home Made Snorkel
Time: ? Difficulty: ?
Vehicle: 1990 Pathfinder Author: Aaron Wiltsey
Instructions
This tech article was taken from a 4x4Parts BBS posting by member "Cruisearound" who seems to be very interested in modifying his own rig and helping others out in modifying theirs.  Many thanks Cruise!
Here's another homegrown Pathfinder mod from Cruise!
This is how I made a deepwater breathing device for my 1990 Pathfinder with the VG30i V6 fuel injected engine.  If you don't have the EFI with airbox, you may still be able to modify your intake so it will produce the same results I got.  The piping under the driver's side fender will be the same, you'll just need to provide a sealed flexpipe into your air cleaner.
For this contraption I used two inch ABS plastic pipe and fittings commonly used for at-home plumbing.  They are all commonly available at most hardware and home improvement stores. 
To explain some of the specifications you will see in the pictures here:
"Short" means the distance from the center of the bend to the fitting is minimal. A "short" 90 degree elbow looks small and stubby compared to a standard one. "Street" elbows are ones that have one female connecting end and one male. Standard is female-female.  The numbers next to the piping in the pictures are angles of the various elbows in degrees.
If you take a look into your engine compartment, you'll see the airbox which houses the air filter.  This airbox is the starting point for the mod.  Connected to it should be a plastic pipe that runs into your fender where the stock air intake "mouth" is.  There also should be a smaller plastic intake pipe that runs across your fan shroud and has a plug in the end of it.  I removed all that and replaced it as follows:
This pic is with the front driver's side fender removed for access.
A pic of the secondary air intake hole that needs to be plugged and sealed.
As an added surprise, this snorkel actually added some extra throttle response and a few horses to my Pathfinder!  Don't ask me why, that's just what it did!  Have fun, try not to get stuck wading through rivers!
 

This great How-To came from Aaron Wiltsey webpage.


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