Originally Posted by whippersnapper02
It could have 73498072398709 miles for all I care and I would still call it a turd. Also we mean turd as in slow no matter what is done to it.
And you have exploited every inch of a 3.0 to come to the conclusion it's a slow turd and nothing could ever be done to it to change that? Or are you just blindly parroting what everyone else has said? Or are you just one of those people that believe because there are larger displacement choices/options, that it can't possibly be better?
Because the 4.0 is a worse design than the 3.0...
Rod ratio, when extracting every little bit of horsepower out of an engine and building something capable of lasting in endurance racing, rod ratio becomes very important. The higher the better, endurance motors usually have a rod ratio between 1.9 and 2.2. The 3.0 has a ratio of 1.76 and the 4.0... 1.55. Here is a "short" list of what raising that ratio brings you:
Less rod angularity
Higher wrist pin location
Helps resist detonation
A lighter reciprocating assembly
Reduced piston rock
Better leverage on the crank for a longer time
Less ignition timing is required
Allow slightly more compression to be used before detonation is a problem
Less average and peak piston velocity
Peak piston velocity is later in the down stroke
Less intake runner volume is needed
Less rod angularity and piston rock promotes long life at any RPM by reducing wear and with less piston rock, better ring seal.
GM understood this principle when they needed an engine for Trans Am racing in the late 1960s, that still met the displacement limitations. They could of tooled up a 305, but what they produced was a 327 and 283 hybrid, resulting in a 302 cubic inch V8 with a very high rod ratio and with production performance heads it produced 403.8 BHP @ 7,400 RPM. The best factory 350 of that era, the ZQ3, could only muster 300 BHP.
Displacement is not the be all, end all, it's what is inside that matters and it is scientific fact that the 3.0 has far more potential than the 4.0.
But we can go back to hating on the 3.0 because it is the cool thing to do.