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Old 09-30-2004, 03:11 AM   #8
Scooby Specialist
Member#: 26876
Join Date: Oct 2002
Chapter/Region: NESIC
Location: 1990 GMC Sierra 4x4 350ci
1994 Camaro Z28 383
Black M6


Part of a post by Jon [in CT] in another thread:

For most fuels used in spark ignition, max torque is achieved with an air/fuel mixture that is about 15% richer than stoichiometric. For gasoline with a stoichiometric ratio of 14.7:1, that works out to 12.5:1. Running an even richer gasoline mixture is "safe" because the evaporation of the extra fuel cools the intake charge to stave off knock; but some torque is sacrificed in the process.
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