Quote:
|
Again, I'm calling misinformation here.
|
I don't necessarily think so. We took the 2008 Hyundai Sonata (X-Prize car) to Roush and they gave us a 42 MPG HWY rating on a 30 MPG stickered car. Yet a few years later the stock Sonatas were getting around that. The newer Sonatas are relying on hybrid and GDI technology to achieve those numbers, whereas we relied 100% on speeding up the burn, then tuning for it. One of a few reasons newer vehicles get better fuel economy than their 10-20 year old counter parts is -- like you said -- better combustion chamber design.
Relying on my experience over lab reports, a hot exhaust manifold = fuel still burning after it's too late to contribute to power. George Arlington Moore did magic with old 1920's engines, and could get the exhaust temperatures down to just a couple hundred degrees. I have had major success with technologies that speed up the burn, including head port work, HHO, HO ignition, ozone, etc.
Quote:
|
If you read through Toyota's publications, they explicitly state that while combustion is effectively "complete" even in older designs, where the low hanging fruit is, is in speeding it up, so more of the energy is released when the crank angle is favorable, and the pressure wave isn't chasing the piston down the bore.
|
What you said!