Hoffman900 wrote: ↑21 Mar 2022, 06:14
ryaan2904 wrote: ↑21 Mar 2022, 06:13
Hoffman900 wrote: ↑21 Mar 2022, 01:04
I would have a real hard time believing the resin in the lift pump would break down with 5% more ethanol content. Everything in the US is E10 since they banned MTBE as an oxygenator and the fuel issues people had early on were due to it cleaning gunk out of the tank, not plastics. If they switched to E85 that would be a different story.
Heating of the fuel could be an issue, especially depending on packaging.
Vibrations inherent to the Honda could also cause the fuel lines / pumps / etc to go into resonance. This is far fetched but you can observe this with side draft carburetor engines. If you are brave, stand next to the engine on the dyno and you won’t be able to grab the float bowl. The carburetor bowl will resonate at such frequency at certain bad harmonics that the fuel foams. The lift pump pressure is probably nothing wild. I forget what the injector pressure has to be. I recently learned it’s 5000psi in DTM. I would have to think about this a little harder before I put any stock as an actual failure mode.
I am not shocked to learn teams in general struggled some with the switch, especially if they, like Honda, are using a hybrid HCCI / TJI combustion concept. I believe Honda only made this combustion concept work reliably by having a fuel developed especially for it. Otherwise it was inconsistent and more a happy accident than anything going by Wazari’s posts.
It is interesting that the RBR cars complained of decreasing power prior.
If fuel was falling off, then the engine would be derating itself, but this absolutely would have showed up along pit wall along with fuel pressure (I have no doubt that is sent to pit wall as well) and I believe would have resulted in a grenaded IC much more quickly.
Gasly’s failure was sudden, so that looks to be an entirely different issue and if that is the cam driven injector pump, that is a Honda part / design (which goes back to my one hypothesis about resonance) as that is directly bolted to the engine and not soft mounted like fuel lines should be.
This is bullshit
Elaborate, please. Tell me why it is and offer up a sound explanation backing it up. I looked up your posts, I’m not expecting much.
According to The Race, they basically ran out of gas due to miscalculation of the heat of the fuel at low fuel levels because they didn’t do any race simulations down to that level. I don’t know if that is true or not, but it is a theory.
Amus, Scarbs and Horner, all confirmed its a fuel pump issue.
Mclaren changed their fuel pumps after quali, before the race.
Fia went far enough to take off the parc-ferme restrictions on the top 10 qualifiers, so that they could inspect the fuel pumps and teams could change them (mclaren) if they wanted.
Amus noted this issue during testing. Whether they reported it then or now, I'm not sure.