BRC vapouriser adjusment
in [LPG]
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From: Austin Shackles on 22 Feb 2007 08:44 Got a BRC AT90E on the current V8 3.5 disco, running open loop. It's just been for MOT and failed on LPG due to about 7%CO. Having spent about 2 hours getting my CO meter to work, I concur, it's way high at idle. Petrol CO figures look about right. Running at 3000 rpm on LPG it was a bit high too, so turned it down to about 1% which should be OK, I reckon, but it's still showing about 7% at idle. Now, on an OMVL I'd now be tweaking the idle settings, but I can't find them on the BRC, if there are any. There's a small-ish brass knurled knob with a hex on it on one side, but undoing it makes no difference to the CO so I don't think that's it. There's also a larger knurled knob at the bottom, which is in a place that leads me to believe it's a drain plug. So happens I have got an OMVL which I could put on it instead, since I know how to adjust those, but I'd prefer to know how the BRC works. Any ideas? -- Austin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too!
From: Peter on 22 Feb 2007 10:51 > Got a BRC AT90E on the current V8 3.5 disco, running open loop. It's just > been for MOT and failed on LPG due to about 7%CO. > > Having spent about 2 hours getting my CO meter to work, I concur, it's way > high at idle. Petrol CO figures look about right. > > Running at 3000 rptm on LPG it was a bit high too, so turned it down to about > 1% which should be OK, I reckon, but it's still showing about 7% at idle. > > Now, on an OMVL I'd now be tweaking the idle settings, but I can't find them > on the BRC, if there are any. There's a small-ish brass knurled knob with a > hex on it on one side, but undoing it makes no difference to the CO so I > don't think that's it. There's also a larger knurled knob at the bottom, > which is in a place that leads me to believe it's a drain plug. > > So happens I have got an OMVL which I could put on it instead, since I know > how to adjust those, but I'd prefer to know how the BRC works. Any ideas? My AT90E has got two hex thingies on the side (look closely, it's easy to miss the other hex!), plus that small brass knob. One of the hex-es is useless, the other does the job - screwing it in leans the mixture, and vice versa. Small brass knob is only for fine-tuning. Big brass knob on the bottom is drain plug, you got that right. Hope this helps, Peter
From: Austin Shackles on 22 Feb 2007 14:08 On or around Thu, 22 Feb 2007 17:51:50 +0200, Peter <peter(a)greatnowhere.com> enlightened us thusly: >> Got a BRC AT90E on the current V8 3.5 disco, running open loop. It's just >> been for MOT and failed on LPG due to about 7%CO. >> >> Having spent about 2 hours getting my CO meter to work, I concur, it's way >> high at idle. Petrol CO figures look about right. >> >> Running at 3000 rptm on LPG it was a bit high too, so turned it down to about >> 1% which should be OK, I reckon, but it's still showing about 7% at idle. >> >> Now, on an OMVL I'd now be tweaking the idle settings, but I can't find them >> on the BRC, if there are any. There's a small-ish brass knurled knob with a >> hex on it on one side, but undoing it makes no difference to the CO so I >> don't think that's it. There's also a larger knurled knob at the bottom, >> which is in a place that leads me to believe it's a drain plug. >> >> So happens I have got an OMVL which I could put on it instead, since I know >> how to adjust those, but I'd prefer to know how the BRC works. Any ideas? > >My AT90E has got two hex thingies on the side (look closely, it's easy >to miss the other hex!), plus that small brass knob. One of the hex-es >is useless, the other does the job - screwing it in leans the mixture, >and vice versa. Small brass knob is only for fine-tuning. Big brass knob >on the bottom is drain plug, you got that right. Hmmm. no sign of other hexes, but then it's not in the ideal place for looking at it. I'll have another look next time it's both light and not raining (much). The small brass knob doesn't appear to do anything to the mixture. On the OMVL, one adjuster is fixed bleed and the other is mixture, dunno if the BRC is similar. The fixed bleed is only really there I think so that it doesn't stall from inertia when going from high-vacuum (e.g. over-run) straight to idle. -- Austin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too!
From: Tom Woods on 22 Feb 2007 17:54 On Thu, 22 Feb 2007 19:08:45 +0000, Austin Shackles <austinDITCHTHISFORBETTERRESULTS(a)ddol-las.net> wrote: >> >>My AT90E has got two hex thingies on the side (look closely, it's easy >>to miss the other hex!), plus that small brass knob. One of the hex-es >>is useless, the other does the job - screwing it in leans the mixture, >>and vice versa. Small brass knob is only for fine-tuning. Big brass knob >>on the bottom is drain plug, you got that right. > >Hmmm. no sign of other hexes, but then it's not in the ideal place for >looking at it. I'll have another look next time it's both light and not >raining (much). The small brass knob doesn't appear to do anything to the >mixture. > >On the OMVL, one adjuster is fixed bleed and the other is mixture, dunno if >the BRC is similar. The fixed bleed is only really there I think so that it >doesn't stall from inertia when going from high-vacuum (e.g. over-run) >straight to idle. Its like alt.fan.lpg here tonight :) Have you not got a friendly local converter you can ring up austin?
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