Non return valve in air box to stop backfire damage

**ozscott** · 10th January 2008, 09:31 PM

Thanks Ron B - I would buy one of those if it were available in Australia. As it is I might get one imported if I cant get similar here, because that looks very good.

Cheers

**ozscott** · 10th January 2008, 09:32 PM

Thanks procrastination inc - where would I get a big PVC jobbie from mate?

**procrastination inc** · 10th January 2008, 09:45 PM

?

try reece plumbing maybe

**ozscott** · 10th January 2008, 09:50 PM

...just searching and it looks like irrigation shops stock brass and also plastic flap type non return valves around the 50mm mark - I will go and check (no pun intended) them out of the pressure needed to open them and get a couple...
Cheers all

**Blknight.aus** · 10th January 2008, 09:58 PM

http://www.emea.donaldson.com/en/com...ary/049945.pdf

eyeball that and the dust vactuator valve becomes apparent.

given that they make a 4 inch version of that filter setup youd reckon you could find room for it under the hood..

**Bradtot** · 10th January 2008, 10:06 PM

Why dont you leave the hose clamps loosish..meaning just tight on the airflow meter to plenum hose, so if it backfires it blows the hose off. I do this on my Rangie and have only had one backfire in several years but it worked and saved my airflow meter.
The idea I got from the RPI website.
Brad who's been on gas since 1993

**p38arover** · 10th January 2008, 10:15 PM

I've got no idea what this look looks like as I can't access eBay: cgi.ebay.co.uk/70mm-ANTI-BACKFIRE-VALVE-LPG-CONVERSION-3-5-RANGE-ROVER_W0QQitemZ220135746141QQihZ012QQcat

See another type at the bottom of : IWEMA enterprise, LPG components

The large flat cover of the plastic LR air filter is particularly easy to modify. If you drilled, say, six large diameter holes of about 30mm dia leaving the webs between them, then you could cover these with heavy wetsuit material, e.g, a mouse pad, hinged at one end. During normal running the pad would be drawn down to seal the holes.

I'm not sure if 30mm would be too big and would allow the pad to be drawn in. One could try more smaller holes, e.g., 20mm.

With a backfire, it would be blown up to vent the pressure,

Ideally it would be better placed between the plenum chanber and the air flow sensor to avoid bacfire damage for the sensor.

One could cut a few holes in the side of the tube and cover them with wetsuit material.

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