Running and engine lean.

[Pink_Floyd]

I seem to remember reading that running an engine mix lean is bad for it. is this true and if so why?

[Cider Andy]

A lean mixture itself would not be bad for the engine, but it does cause pinking (or detonation, or pre-ignition) in much the same way that running the engine on a low-octane fuel does. At it's extreme, pinking can cause physical destruction of the piston crowns and other related damage.

[griffter]

An engine running lean will also run hot.

[That Daddy]

Any leaner than these cars already are(emissions for cat purposes)will be flat spots and performance as flat as a nuns tit,their already borderline standard this motor design combustion chamber/pushrods/2 valve heads shape coupled with bobweight dizzy naff injection system etc was never designed to run this lean,hence why some lurch & buck at low speed(on the cat map)

Edited by That Daddy on Thursday 7th June 08:06