Thread: Start on Petrol or LPG?

Originally Posted by bee utey

Mixer type dual fuel systems on EFI vehicles generally start with a short burst of petrol. If they don't start well on LPG the petrol timer is likely out of adjustment or incorrectly set up. Running a dual fuel engine on petrol when cold is only shortening its life. Rings don't need bedding in each morning. My wife's old P76 did 400,000km on straight LPG and still has perfect compression figures. It also started easily when cold every day because of the right choice of high energy ignition and plug gap adjustment.

What do you do with the gap and heat range for gas ?

Originally Posted by chopper

What do you do with the gap and heat range for gas ?

Plugs 1 step colder heat range than stock setting or even 2 steps if its straight gas, gap around 30% smaller than the book figure, or around 0.7 - 0.8mm for a high energy ignition, 0.6mm for points or cars that easily backfire.