Originally Posted by
xspower
The higher the elevation will be the lower you want the cyl. head. you need to lower the head because the engine does not have a dense enough air charge to compress. The lower the more dense the air is and the higher the head clearance will need to be. As far as the plug goes ....it is running 30%... With the relationship to fuel and humidity, Remember the basic fact that the rain or for that matter a humid air carries water.....
Yep: I agree about altitude needing less head clearance, but I didn't think this difference between 50 and 300ft would make such a big difference to take out any shims, just some needle adjusting...??
About glow plugs, I run 25% fuel (not 30%), and I though detonation is a sighn of too low combustion chamber, not of too hot a plug...hmmm. I'll keep it in mind.
About humidity, I'm not really sure (that's why I asked , heheheh) if it makes motors leaner or ritcher...(?)