I picked up some NGK Laser Iridium Spark Plug IFR5N10

I know they come pre gaped but what is the actual gap suppose to be?

I've seen anywhere from .033" to .040" or up to 1.02 mm

Anyone know?

 

1 mm.

 

So we have a 1.0 mm which is 0.0393"

Thanks!

 

Yes, 1.00mm or if you were running on LPG could be down to 0.80mm.

 

Unfortunately the LPG kits / conversions available there, are not available here. It would be nice to try. Share your thoughts on it though, probably not many folks here have heard of it. Perhaps start a thread on it..

 

The economy of LPG is all down to the price differential between it and the price of gas. Here in the uk LPG is anything from about 65p ($1.02)/L and 76p ($1.20)/L and gas is around £1.129 ($1.78)/L and £1.209 ($1.90)/L. Based on the price alone this means you'll get almost the equivalent of 20mpg cost wise.

In practice LPG is about 10% less efficient than gas, so if you were getting 13mpg on gas you'll get 10% less on LPG.

One of the drawbacks of LPG is that over time VSR (Valve Seat Recession) occurs and (as I'm having to deal with right now) you need to do a head job including fitting hardened valve seats. Having said that my Disco is 10yrs old and has had LPG all that time and done 110,000 miles. Despite this drawback LPG is popular in Europe and makes the gas engine more affordable to run.

 

I would be curious about part numbers of the head job stuff, valve seats, etc. etc. feel free to PM me so we don't derail the thread here.