75/76 Cold Air Induction

[Oneball]

Half cruise and half boot would give an average AFR of an intermediate value.

There’s 4 “peaks” on that graph: Idle, cruise, accel, overrun.

 

[Vetman]

There’s 4 “peaks” on that graph: Idle, cruise, accel, overrun.

Yes I agree. I’m not an expert but as I said when I presented it, the distributions vary, different drives produce different distributions. There are optimum AFRs for each stage of the driving cycle. The distribution shown is a summary. You have to look at the real time trace to compare revs, vacuum, and AFR and decide if the AFR is appropriate to the situation. Not easy to do when driving on the road rather than some very controlled environment.
My feeling is that the AFRs are about right. The ideal AFR for petrol is 14.7 but for more power (my aim), a richer value is optimum because the mixture within the cylinder can be variable and more petrol ensures that the available oxygen is more completely burnt.

 

[teamzr1]

Here is another way to suck in lots of air as the new LT6 engine

 

[Nassau65]

An engine looks so nice when it’s all nice and clean, shiny etc.

 

[Forrest Gump]

I like how the intake / runner is a straight trumpet on the LT6.

A chart I found gives an indication of the benefits of cold air induction - quite significant.