Mudflap wrote: ↑09 Jan 2021, 19:37
There is something going on with off throttle fuel burning.
Translation from ispano:
viewtopic.php?p=947816#p947816
The fact that the FIA have introduced new rules regulating the consumption off throttle is probably a response to someome doing something clever. At the end of the day whenever the engine is using less than the maximum fuel flow it is throwing away electrical energy that could otherwise be deployed (at the expense of greater fuel consumption).
I don't know about the compression ratio, for all we know all of them could already be at the maximum allowed.
The geometric CR limit is 18:1, as far as I'm aware no one is there yet. It is extremely difficult to run geometric CR at 16:1, let alone 18:1. If I had to put a number on it, GCR is ~14-16:1, any more than that, and you'd need to lower working compression ratio with Miller cycle. 18:1 at 4.5 bar MAP means detonation city, as you're entering diesel engine compression ratios.
The regulation limits aren't just some numbers that teams can easily surpass and are having to hold back. They are very difficult to achieve. Given the strength needed from the crankshaft, it's insane they can make it weigh 5.3kg. That's less than 12lbs or the weight of an average house cat.
The forged crankshaft on my S2k can take 1,000+ hp but that sucker weighs over 20kg.
Also it was discovered the MGU-H can indeed harvest detonation pulses. However the detonation doesn't originate in the combustion chamber but rather the exhaust pipes. There are also secondary benefits, as it allows one to run higher duty cycle on the wastegates for the same compressor boost pressure. Incidentally this was discovered by accident because the wastegates slow down the detonation enough for the MGU-H to successfully harvest it. It gets complex because detonation waves affect cylinder scavenging, and so changes to the engine can be made to get more out of it.
However that alone doesn't account for the entirety of the gains, sure it makes harvesting a bit more flexible, but the real breakthrough for Honda was in energy deployment. Saving some on the straights, and using more on the flat out corners that scrub speed gave Red Bull the edge.
You noticed how RB repositioned the exhaust wastegates? Not only was it to fit a new engine cover, they also wanted to take advantage of the fact they had more gasses coming from their pipes.
Another fairy tale
The End.
