[Diy_efi] OL operation - How lean at cruise?

[gary]

Theoretically, AFRs up to 20.0:1 are possible.  How close realistically
a person gets to that figure, will depend on how uniform the atomized
fuel particles are distributed in the mixture, once in the chamber prior
to initiation of flame front.  Also, and very important, is how uniform
the actual AFR is among the various combustion chambers of the
engine.  The need for complimentary 'tuning' is a given here.

GAS


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org
> [mailto:diy_efi-bounces at diy-efi.org]On Behalf Of hugh at sol.co.uk
> Sent: Thursday, March 31, 2005 2:59 AM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] OL operation - How lean at cruise?
>
> I read on here a while back that an AFR of 16 : 1 was the most
> economical cruise mixture.  I have experimented with 16 : 1 and
> 17 : 1 without much to choose between on economy.
>
> My Exhaust gas temperature creeps up to 800?C when doing
> about 90 MPH on the UK motorways at 16 : 1,