Thread: Good Timing
View Single Post
Old 01-19-2009, 04:25 AM   #16 (permalink)
roflwaffle
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 122 Times in 80 Posts
FWIW, based on what I've read it seems that advanced timing is only needed if the ratio of gearing/displacement given some power output isn't optimal. The lower the air&fuel to cylinder volume ratio, which corresponds to lower torque, the farther apart in the cylinder pockets of air/fuel can be, and the sooner ignition needs to start to get all the air/fuel burning up around TDC. W/ pockets that may be farther away, retarded ignition may not result in everything igniting until after TDC. W/ proper gearing and greater torque, the mixture is more or less homogeneous, and in this case even/consistent ignition of the whole mass in the cylinder is much more likely.
  Reply With Quote