Snorkel not sucking air

[ckh]

I bought a no name snorkel off ebay for a bargin price, Installed it today, but when I did the kead test there was little to no suction at the snorkle, the reast of the air intake in my 89 GQ TB42 is standard, I've worked my way back to the main airfilter, but even at that point on the airfilter housing there is little suction, do I need the "heater box thingy" to I need the cyclone prefilter thingy? should I just run a hose straight fro the airfilter to the snorkel? only problem with that is the outlet on the air filter is rectangle and the snorkel connection is round. I've read the forums, and if take the lid off my air filter and cover the carby mouth with my hand there is pleanty of suction and the engine dies.. so I'm going to invest in some rubber tomorrow from calrk rubber or the like and make gasket to seal the airfilter lid to the airfilter..

I've thought about using the "heater box thingy to seal it all iup and use it as an adapter to go from rectangle hose to round.

Any other suggestions would be appreicated..

[MudRunnerTD]

So if you completely cover the snorkel head with your hand does it effect the revs of the engine? take the snorkel Head off and you will be left with a 3" round hole, put your hand over that.

With the bonnet up do the above test an see if you can hear where the air is getting in because it must be getting in if there is no change to the revs when restricting the snorkel. If this is the case then the snorkel is a waste of time ;)

I dont think the problem is the chinese snorkel! It cant be! the snorkel is basically a big plastic straw! if you can roll a golf ball down it then there is nothing wrong with it.

Check the rest of your install mate.

[ckh]

So if you completely cover the snorkel head with your hand does it effect the revs of the engine? take the snorkel Head off and you will be left with a 3" round hole, put your hand over that.

With the bonnet up do the above test an see if you can hear where the air is getting in because it must be getting in if there is no change to the revs when restricting the snorkel. If this is the case then the snorkel is a waste of time ;)

I dont think the problem is the chinese snorkel! It cant be! the snorkel is basically a big plastic straw! if you can roll a golf ball down it then there is nothing wrong with it.

Check the rest of your install mate.

have tried to test it with the snorkel head/ram off and no difference, the only way I can starve the motor of air is taking the airfilter lid off and covering the carby throat, even with the airfilter cover on at the intake there is little sucktion. have taken the head off the snorkel and made no difference.
the only way I can starve the engine of air is if I remove the filter cover and put a bag over the carby throat.. if I try doing that at the airfilter intake even there is little to no suction suction, I'm going to invest in some rubber tomorrow from calrk rubber or the like and make gasket to seal the airfilter lid to the airfilter body..

[ckh]

Do I need the prefilter and the box which sucks hot air up from exhaust manifold? I noticed with regards to that heater box, if I disconnect the vacum line the flap inside is in open position, if I attach the vacum it closes off, so would be blocking air coming in through the precleaner and subsequently snorkel..

[taslucas]

hi mate, do you have lpg fitted?

[threedogs]

One of those easy fixes where you need to be there, as MR said its only a straw, what makes you think its not working???

[rkinsey]

If the only way to retard the air intake is at the throat of the carby then I would work back from there.

Install the Air Filter and if you cant retard the air intake from there then the Air Filter housing is "Leaking" fix that issue before than moving onto your next connection.

Cheers,

Rob

[BigRAWesty]

As rob said, start at the top and work from there. seal each piece as you go. It may require rubber gasket, gasket seal a rubber seam strip.

When your finished it should be one continuos system.


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[ckh]

hi mate, do you have lpg fitted?

No LPG just petrol

[ckh]

One of those easy fixes where you need to be there, as MR said its only a straw, what makes you think its not working???

Because there is no air being sucked in, if I do the leak test nothing, cant even feel any suction on the snorkel with the head off of it..

[nissannewby]

I would do what others have stated starting with your air box and so on. A petrol wont have a huge amount of air flow pulling through at idle and wont need a lot of air either to idle. Get the silicone out and check your hoses and start from you airbox.

[ckh]

I would do what others have stated starting with your air box and so on. A petrol wont have a huge amount of air flow pulling through at idle and wont need a lot of air either to idle. Get the silicone out and check your hoses and start from you airbox.

Ok today spent a bit at clark rubber, firstly made a good seal for the airfilter, now if I cover the intake there the motor stalls used several tubes of silastic on all the joins, and plugged up the heat transfer butterfly etc, now get just enough suction in the snorkel to hold a piece of paper to the ram. but still not happy the amount of suction at the end of the snorkle is about 5% of the suction at the intake on the air filter, I bought a couple of meters of flex hose 3inch and want to run it straight from the air filter to the snorkel, taking all the other joins and possible leaks out of the equation. problem is the inlet on the airfilter is rectangle and the hose is round. is there an adapter I can buy or does anyone have any other suggestions, was thinking of getting another airfilter body from the wreckers and see if I can panel beat the rectangle into a roundish shape to clamp the hose onto.. Am open to any and all suggestions.

[BigRAWesty]

Any good manufacturing workshop will be able to either make a square to round, or beat your intake round.

Were are you located??


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[taslucas]

A mate did the very same thing. Went to a plumbing/sheet metal place and git the square to round made up. It works out a lot cheaper if you just get them to spot weld and you do all the sealing with silicone etc yourself. I have pics I can post when I get back to the lappy.

Tap, crackle, pop

[ckh]

Any good manufacturing workshop will be able to either make a square to round, or beat your intake round.

Were are you located??


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

Ipswich QLD

[ckh]

A mate did the very same thing. Went to a plumbing/sheet metal place and git the square to round made up. It works out a lot cheaper if you just get them to spot weld and you do all the sealing with silicone etc yourself. I have pics I can post when I get back to the lappy.

Tap, crackle, pop

If I block the snorkel head there is a little suction, but no where near as much as at the mount of the airfilter housing, so there has to be a leak some where, am going to get a rectangle to round pvc adapter from plumbing supplier today and run a 3 inch host straight from the air filter to the snorkel to illimate leaks in the existing hoses and joins, that way too will only have to worry about 2 joins being sealed correctly rather than 7.

[taslucas]

Is it sealing around the top of the carby? Between the carby and the airbox

Tap, crackle, pop

[ckh]

Is it sealing around the top of the carby? Between the carby and the airbox

Tap, crackle, pop

Yes I had to make up a gasket with the foam I got from clark rubber, as when i started testing I could put my hand over the airfilter intake and very little suck there, after making the gasket up for the lid, put my hand over the airfilter inytake and the motor stalls, plenty of suck there now...

[nissannewby]

put my hand over the airfilter inytake and the motor stalls

Lucky its a petrol a diesel would near pull your hand in lol.

[threedogs]

You're missing something simple, airbox, snorkel and a few joins two tubes of silicon is a huge gap
cheap snorkels, you get what you pay for, another 6 tubes of silicon might fix it

[ckh]

You're missing something simple, airbox, snorkel and a few joins two tubes of silicon is a huge gap
cheap snorkels, you get what you pay for, another 6 tubes of silicon might fix it

If everything is sealed correctly should I expect as much suction at the top of the snorkel as I do if I disconnect the air hose and put my hand over the air intake on the air filter housing inlet?

[BigRAWesty]

Well yea you should. It may feel a little less though as the top of the snorkel is roughly 3" and air box is less..


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[ckh]

Well yea you should. It may feel a little less though as the top of the snorkel is roughly 3" and air box is less..


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

OK double checked all the joins, and found there was a bit of air sucking in the "hot box" the thing that sucks air up from the exhaust manifold, pumped a heap more silastic in there, and now when I put my hand over the snorkel, I can hear a change in the motor, but far from stalling, is that good enough, I dont plan on ever having my bonnet underwater, as the electrics would die first, just want to make sure if I did go though something deepish, that it woudnt suck air in through the guard were the stock intake is located...

Any other suggestions or recommendations would be appreicated

[ckh]

A mate did the very same thing. Went to a plumbing/sheet metal place and git the square to round made up. It works out a lot cheaper if you just get them to spot weld and you do all the sealing with silicone etc yourself. I have pics I can post when I get back to the lappy.

Tap, crackle, pop

yes picts please..