O.K., here's my thought. Take 2 identical cars with the only difference being that one of them has higher fuel pressure. As the timing is advanced, which one will start knocking first?

 

Stumped?

 

the one with lower pressure will knock first. Extra fuel cools & slows the combustion of gasoline and reduces knock.

The richer you go, the more advance you can run without knock..


however, maximum power is found when you are at the lean limit of combustion at WOT and the spark advance is reduced to the point where knock is only ocurring right after the shift changes.

ie:
a car running @ 11:1 A/F ratio & 40* total timing will NOT run nearly as fast as
a car running @ 13:1 A/F ratio & 34* total.

this is assuming your normal small block chevy V8 engine running on pump gas.

ODB

 

True, true.



------------------
60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

So it's ok if it knocks, just as long as it's right after the shifts?

 

load induced misfire is normal right after a shift as long as it's very brief and mild.

 

load induced misfire is normal right after a shift as long as it's very brief and mild.