LPG running lean - how will I know?

[Lpgc]

I didn't see Classicswede's post before I wrote the last post, don't know how I missed it! But it seems we agree on all points...

Simon
Lpgc

[classicswede]

Some interesting reading

http://courses.washington.edu/me341/oct22v2.htm

Pre ignition v Detonation

http://www.contactmagazine.com/Issue...ineBasics.html

Engines running LPG using a petrol ignition curve are very unlikely to suffer from either has LPG has a much higher octane rating. Also as LPG burns clean and gives no carbon deposits then hot spots caused by carbon build up are not very likely.

Yes LPG does burn hotter and will put extra stress on head gaskets and the exhaust valves but clearly not a problem for a well made engine in good shape. Engines that struggle to stay in tact when running on petrol and not going to last on LPG.

I could not find any well written pages on IC engine burn temps with different fuel and AFR's does anyone have any good links

[Clifford Pope]

Originally Posted by Lpgc

You cannot tell if an engine is running rich or lean by looking at the plugs after running on LPG.

I realised they can't go sooty if rich, but I thought I read that lean can still cause a bleached blistered look.
Seems not - thanks for that correction.