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[speakingclock]

Success at last!! LPG running ok. I've installed a mixer system, tickover is a bit lumpy but more fettling to do yet. Normal running is slightly less progressive but barely noticable.  Mixer ring is in the intake duct over throttle body just clearing breather, Injection Modulator wired into loom within ECU Box and all tucked away in there.  There is no lambda signal and ajustment is made on gas intake hose and vapourizer, I suppose the balance is quite fine to get a good tickover.  One small backfire when switched over too early/cold otherwise no problems as yet.....  System was reasonably easy to fit just need to have it certified before using on a regular basis on the road.

[Jay w]

i have heard some horror stories about mixer systems backfiring and causing damage.

from what i can gather the best way to switch over is when the car is on idle and under no load

[speakingclock]

Hi Sir Knight 8-).  I've only just completed the installation and have not done any extensive testing.  I have however changed fuel at high speed, low speed and intermediate speed, I experienced a small back fire at low speed, the system was quite cool at the time. I still have some fine tuning to do, I hope this will ensure smooth running.  The system is very basic as I'm a cheapskate when it comes to cars.  The vapouriser I bought is suitable (I'm told) to support an injection system too. If I do have problems then I may add these at a later date.  If it works to 80% efficiency as petrol I'll be more than happy.  My journey to work often exceeds 30 miles and minimun is about 20.  I'll give it a good trial and report back any findings over the next week or two.

Thanks for your comments.

[MartinP]

i have heard some horror stories about mixer systems backfiring and causing damage.

from what i can gather the best way to switch over is when the car is on idle and under no load

My mixer system would not change on idle, you had to rev over 1700 rpm to pull in the solonoid.

The only time it missfired was when there was an ignition fault causing pre-ignition in the inlet manifold which "blew the bellows to bits"  

[Kevin Wood]

This is the problem with mixer systems. The inlet tract is full of a perfect fuel-air mix. If the engine is running lean (which is more likely to happen when cold, of course) it can spit back through the intake valves and ignite it.

Kevin

[MartinP]

Only blew three sets up in 30,000+ miles, and it was two seperate incidents, both unrelated to the gas.