Carnut1 wrote: ↑Thu Apr 19, 2018 7:52 pm
Swirl ports can make good power they just don't like high rpm. Thanks, Charlie
Same goes for the 96+ Vortec's too. They have an optimum window of operation(velocity) that they work best in. Put them on a 406+ engine and try to rev them and they fall way short very quickly up top. Short side speeds get crazy fast and they stall and go turbulent in the higher lift ranges.
The other thing to keep in mind is that as the torque output goes up at lower rpm's so does the cylinder heads requirement. And a better head then allows a smaller cam without hurting peak power output a great deal. So, looking at some of the engine masters builds as a benchmark for very high specific output starting at much lower rpm's(2500-3000), you'll quickly see these guys aren't running tiny 180cc heads with little street lift cams and lower ratio street compression. Lot's of ways to skin the same cat.. but some ways will be MUCH cheaper than others.
For lower rpm deals.. I like compression.. VERY tight squish.. lot's of part throttle ignition timing(relatively speaking in comparison to the "accepted norm").. increased lean burn capability at steady state cruise.. and very low throttle angles due to the carb's increased signal quality and ability to better atomize the fuel to achieve said lean burn characteristics. Smaller primary headers with tiny'ish collectors, cooler intake charges, lower water temps, underdrive pulleys, efans also run hand in hand with greater throttle response and low engine speed efficiency as well. Every little bit helps in cumulative fashion. They may not rev all that high but much bigger balls than most similar parts combo's they will have.
