Quote:
Originally Posted by MOTORHEAD
A/f 13.5 with idle mix screws 1&1rch out. idle ok but not as smooth as 1& 1/2 turns out which gives me 11.5 and teary eyes. This engine likes a rich idle, makes no sense to me!
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If you have a fairly wild cam, you'll get high hydrocarbons and teary eyes from the high valve overlap and late closing inlet.
The rich idle shows up as unburnt fuel since all the available oxygen was already used up in the combustion process.
Getting the A/F ratio to read chemically correct may make it lean in the cylinder. Unfortunately, this is where sequential EFI wins.