Fitting a snorkel with gas.

[mick.]

I recently fitted a snorkel to my duel fuel 4.5 litre GU and mine wouldn't get out of the driveway without fitting a balancing tube. I even fitted a safari sock in my snorkel as well as the balancing tube just to be sure. I've only recently had a new convertor and gas computer fitted to mine to as it had been running rough for a while on gas.

Since fitting the snorkel, balancing tube, new convertor and computer it actually goes just as well on gas as it does on fuel which it's never done since I owned it. Now mine doesn't fluctuate at all even on windy days or jaming the brakes on hard which I think most of my problems where caused by a dodgy convertor. Mines also an auto so having it stall is never good.

The sad part about doing this mod is I had to get the info off the internet myself as 2 different gas installers I spoke to hadn't heard of the mod before.

Cheers Mick.

[Mojo01]

I booked my GQ 4.2 efi petrol/gas into ARB today ( for next week ) to get a snorkel fitted, I was told by ARB that there is a chance that the snorkel may cause my gas to run lean and thus cause overheating and or stalling, they said its just a matter of going to a local gas guy to get a fix done( if its a problem) they even recommended one to me

[Dawso]

I have been trying to find out where to connect the bypass pipe up to and from but cant find any decent info, even two gas company's said they haven't heard of it and I wanted to pay them to do it not just get the info out of them.
GQ 4.2 EFI by the way.

[Irish]

Mine(TB42s, OMVL system) would stall on gas when I fitted the snorkel until I fitted a balance pipe going from the dirty side of the airbox back to the converter to equalise the pressure on the diaphragm.

[ozzymalone]

Hey Irish! You got any photos of your set-up? Been looking at getting a snorkel set-up but too hesitant until i can visualise the balancing pipe setup...Cheers

[Irish]

Mine is pretty agricultural, just drilled a hole in the airbox, screwed in a barbed fitting and epoxied it in place to seal.
Then ran some spare heater hose back to the converter.

Here's the only pic I have:



If I get a chance I'll take some more pics.

It instantly sorted out the stalling issue and it ran beautifully on gas, needs a re-tune now though.

One thing I will say is to make sure when you install the snork, that you seal the entire intake.

Mine isn't sealed properly and I found dried muddy water in the intake after a recent trip to Tallarook.

[Dawso]

Mine is pretty agricultural, just drilled a hole in the airbox, screwed in a barbed fitting and epoxied it in place to seal.
Then ran some spare heater hose back to the converter.

If I get a chance I'll take some more pics.

It instantly sorted out the stalling issue and it ran beautifully on gas, needs a re-tune now though.

One thing I will say is to make sure when you install the snork, that you seal the entire intake.

Mine isn't sealed properly and I found dried muddy water in the intake after a recent trip to Tallarook.

Thanks for the pic Irish, where does the pipe connect to in the converter is there a single air intake on it?
Why does it connect to the dirty side of the airbox?

[Punderhead]

thnks for that - are you able to grab a few more pics of the connction to the side other than the airbox?

thanks!

[Kevs GU]

2002 4.8l tried reversing the head to face backwards didnt work had balance pipe fitted now runs great.

[mudmav]

been working with other problems on a impco 300a and came across the air intake specs for this model and no way a snorkle would affect it and if i wanted to somehow force more air into it they actually have the nessaccary stuff and worksheets to show you how to adapt the carb to allow for high air flow .
just look at the impco website,

mudmav