Dedman’s $100 forester snorkel build

Dedman

Forum Member
Joined
Dec 3, 2012
Messages
766
Location
Perth Western Australia
Car Year
1999
Car Model
Forester
Transmission
5MT
Here is how I did my snorkel. Didnt manage to take photos along the way though...


Step 1: Obtain snorkel from ebay NH-NK Pajero Snorkel (made an offer of $100 on a snorkel from outdoorsrusaustraila)

Step 2: Line up snorkel on body and work out location of main hole, build up confidence and cut that hole:eek::eek:…. If it’s not exactly right the snorkel is wide enough to cover up some mistakes (my hole ended up being closer to an oval that a circle)

Step 3: Close up one end of the snorkel with duct tape

Step 4: Fill Snorkel with water then add sand to water until all water has been displaced by sand. Now seal up other end with tape

Step 5: work out how the snorkel needs to be bent to make it a better fit (in my case it was three bends: bend backwards towards pillar, bend top section outwards away from car and also twist the top section clockwise when looking down the snorkel from the top)

Step 6: Clamp the lower section of the snorkel securely so you can bend it easily (it does take quite some force) Heat snorkel with blow torch to soften the plastic. If you want to retain the snorkels outer surface texture do not heat very much on these surfaces but apply more heat to the inner (will be hidden) surface. You don’t want the plastic to melt at all or catch fire, just go somewhat softer.

Step 7: Once plastic is soft (softer) bend snorkel to desired shape and whilst holding in bent shape apply a wet rag or similar to cool plastic so it does not bend back so easily

Step 8: Check bending results on car and repeat as required (took me around 10 tries until I was happy with the result)

Step 9: check to see how the snorkel is sitting against the body work and remove inside edges where required to get a better fit.

Step 10: Make a new bracket to mount to the pillar because unless you to a much better job at bending the snorkel the supplied one wont fit.

Step 11: Work out how to drill the rest of the required holes in the correct position (I put all the stub bolts in put it against the car and marked. Worked out perfectly for me)

Step 12: work out how to connect the snorkel output to the engine (Ill go through how I did this later)

Step 13: Put it all together and stand back and take in just how good your forester now looks


Here is the finished product :ebiggrin:;

9274680602_c7a954167b_c.jpg

9272014463_35423f0e0f_c.jpg

9271881319_155a552068_c.jpg



And this is how I connected the snorkel to the engine;

9272041761_2152c8715b_c.jpg

9274815972_723c5bac1b_c.jpg



As you can see I had to do some more body work adjustments to get the connecting pipe through.
Now to the connecting pipe material;

It is a hybrid material make of ducting material I found in the shed (originally purchased from whitworths I think) and an old motorcycle inner tube;

9272053475_e06e9cfabe_c.jpg

9272065809_e3279e973f_c.jpg



The wire in the ducting material was very strong but the connecting material was weak and already had some holes so I put it inside the tube (god that was a mission:shake:). The end product was a very flexible, tough material with a large diameter which was perfect for the job.

Very very happy with how the snorkel turned out:monkeydance:much better than I was expecting.

Now I need a diff breather and fan cut-off. Any suggestions as to how to mod the wiring system for the fan cut-off would be appreciated.
 
Looks awesome mate! :lildevil: Time to hit some puddles!

I still have mine sitting in the shed, I have the exact same snorkle :cool:

For the wiring you can cut the power size of each plug on the harness at the bottom of the radiator fans. Then run 2 lots of twin core 4mm(don't use smaller wire!) into the cab and into a 20amp switch(use a rocker cover style switch so you don't knock them off while driving).
Use could also wire this up from the back of the engine fuse box if you choose. I also wired in a buzzer when the switch was activated so I knew they were off. I once forgot to turn them back on after going through water.... looked at my temp gauge and it was up in the red :surprised: This happened twice in one offroad outting last year. I'd recommending soldering the connections over crimping or scotch locks as the water could cause corrosion. The last thing you want is for the fans not to work when they should.
Have fun and let me know if you get stuck with the wiring.
 
Thanks Taza. Are you saying the two fans have a common positive supply and are switched on their negatives?

Yeah I was thinking of doing something like that but was wondering if there was a better way... Ill probably put a relay in so that I dont need to run heavy wires to the cab.

Im also planing to put the switch on a timer so it always goes back on automatically, maybe 30sec to 1min I figure if you have been sitting in water for more than 1 minute then the radiator will probably have cooled down enough not to turn the fans off.
 
Very very happy with how the snorkel turned out:monkeydance:much better than I was expecting.
I too used the same snorkel on my (MY05) Forry :cool:

Very well done & great write up too mate :raz:

Just a suggestion & something I also did once mine was fitted, was to give the ECU a reset aswell :iconwink:

Regards
Mr Turbo
 
Just a suggestion & something I also did once mine was fitted, was to give the ECU a reset aswell :iconwink:

Yeah with all the other work I have been doing the battery has been out for a week or so. If that didnt reset the ecu nothing would have.


I have discovered a very interesting side effect of fitting the snorkel. Since fitting the snorkel my brakes seem to have become far more sensitive. I cant for the life of me work out why. At low speed I figure the extra drag from the snorkel would produce a larger vacuum for the vacuum assist on the brakes resulting in better braking. However today I did a high speed braking test and I locked up very easily.....

Maybe I dont understand how brakes work or maybe its something else but I would be very interested in your opinions.
 
"I have never locked but would expected the vacuum to come off the exhaust manifold"

Havachat - this is incorrect exhaust has back "pressure". Intake sucks in air and fuel (ie vacuum). Vacuum assist lines come of the intake manifold.

Dedman what I think is happening is that you have added the snorkel and the engine is having to suck harder to get air therefore you have greater pressure drop ( more vacuum) and therefore more assist for your brakes. It indicates that the snorkel is a bit restrictive.


Have you noticed any change in performance or fuel economy? If it was me I would be going through the piping carefully to try and make it as free flowing as possible.
Ps I like what you have done and the snorkel looks great.
 
Since I added a snorkel to my Forry, I've never noticed any difference to my braking :cool:

Regards
Mr Turbo
 
It could be that I was imagining things. I doubt that the snorkel creates much more drag in the system especially at speed with that big air ram. Its is a very clear path between the engine and the snorkel with all pipes larger than the stock ones.

I had been driving dads holden rodeo around for the last 2 weeks which has brakes that are not so good so jumping back into the subaru may have made the brakes seem better. Also sitting in the rain for 2 weeks whilst I was working on it caused the disks to rust which maybe made them more sticky......
 
Gidday DmW

It could be that I was imagining things. I doubt that the snorkel creates much more drag in the system especially at speed with that big air ram. Its is a very clear path between the engine and the snorkel with all pipes larger than the stock ones.

Nah, flaming engine only has to pull in its swept area x times per minute, and a pipe that diameter has a theoretical flow of at least 10x pm ...

I had been driving dads holden rodeo around for the last 2 weeks which has brakes that are not so good so jumping back into the subaru may have made the brakes seem better. Also sitting in the rain for 2 weeks whilst I was working on it caused the disks to rust which maybe made them more sticky......

Now those two points do make a lot more sense. Specially the surface rust on the discs. Even when Roo2 has only been standing for a day or so, the brakes are a tad more grabby. Discs are like that, IME ... :iconwink:.
 
Looking good man. I just got mine in from Malaysia today, itching to slap it on. I've got the radio antenna on the RH fender to deal with as well, hope I can get the snorkel and it to play nice.
 
9274815972_723c5bac1b_c.jpg



As you can see I had to do some more body work adjustments to get the connecting pipe through.
Dumb question: This is where I'm at now, did you cut anything or just bend it out of the way?

BTW I had to delete my FM radio antenna but it looks like the snorkel is going to cover the hole.
 
^
Yeah I had to cut quite a bit. I tried to work out how to do it without cutting but in the end I decided it was just going to be messy any other way.
 
What sort of "blow torch" do you use for this job? Something like below:

mini-blow-torch-15882833.jpg


I'm hoping to be at the point of bending a snorkel tomorrow ;)

Cheers

Bennie
 
Back
Top