Quote:
Originally Posted by Ecky
There isn't really a magic bullet to solving the compression / knock issue. Adding a point of compression gives a few percent thermal efficiency, but unless you can run Atkinson cycle, you then lose that efficiency through retarding ignition timing, or you lose the monetary gains through high octane fuel. Turbos are just another way to get more compression, and come with the same set of issues. There are combustion chamber tricks, such as Logic's quoted tuned headers, changes to piston design or valve timing or combustion chamber shape, but these are largely outside of our control as lay people.
I'd wager the best engine swap might be one of the Toyota Dynamic Force engines. Honda never mated their highest efficiency engines to a manual transmission; the L series in Honda's hybrids were 13.5:1 CR in the automatics, but only 11:1 in the manuals. Mazda did Atkinson Cycle + manuals right, but due to cheaping out on materials, their efficiency is only mid 30's %, similar to the non-Atkinson Honda engines. A Toyota 3- or 4-pot Dynamic Force engine can reach 40-41%, they have manual transmissions available, and make decent power. Nobody else, other than perhaps Mercedes, seems to be building maximum efficiency gasoline engines.
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This is an interesting read once you get into it:
https://turbobricks.com/index.php?th...y-tried.66779/
All sorts of testing and reporting back by engine builders.
Headers... Id just take it to someone reputable and ask for the equal length system and a pressure wave terminator. Plans in hand.
If I could afford it..
I had this in a tab:
Cams: Same story.
If I could afford it!
Fuel and spark:
There I'm light.
pgfpro will know for sure. And about most else here.
And don't forget the water mist. As long as the vehicle is in a dry climate it will help.
I fill the house cooler up daily already. It's quite affordable..
Shot for the engine info. Interesting!
That 16-17 to 1 BYD engine; I'd love to see stripped down.
What do you think we'd find?
Sodium-filled engine valves?
