Your presumption is based on that we actually have good data for what a carburetor can cool things to. Ultimately, this all has to be measured in the cylinder (as that is what matters), not in a port or a plenum. Maybe Clint has data from some clients.digger wrote: ↑Wed Sep 29, 2021 6:32 pmThe question I was asking was is there any data that shows the fuel injection actually cools the same or better?hoffman900 wrote: ↑Wed Sep 29, 2021 10:02 amYou could start by putting the injectors at the same distance from the valve as a carburetor booster.digger wrote: ↑Wed Sep 29, 2021 12:25 am I’d also like to see data showing a fuel injection system available for mere mortals that cools the inlet charge better than a well sorted carb.
Obviously fuel injection has other advantages but that’s a big one to overcome purely looking at from a hp perspective ( throw in $$$ and hard for some to justify ) and of course there is more to a “tuneup” that wot peak power.
I’m not a carb guy and will be shortly upgrading my efi system to something more modern
I'm not sure why people put injectors in the runner of a carburetor manifold, maybe 6" closer to the valve and bypassing the plenum aspect, and are surprised it makes less peak. It seems like such a "d'uh" moment. Want to make more power? Move the injectors further away from the valve. People have understood this for 50+ years.
Gary, I have, and I'm not going to spell out what I have done for you. The sims make for nice presenting, but most of my real data isn't my own and not for public, because we're racing.
Engine Masters tv is just magazine fodder. Remember when they dented the header, found no change, and said it should be no problem? Sorry, that's not science and they are missing some HUGE points from that test (like the header was way too big and was not the bottleneck in that combo).
Again, in the Richard Holdner video.Why do myself and others have to keep repeating this?I'm not sure why people put injectors in the runner of a carburetor manifold, maybe 6" closer to the valve and bypassing the plenum aspect, and are surprised it makes less peak. It seems like such a "d'uh" moment.
Most of what you guys see out there is the gym equivalent to bro science... Maybe that's a little insulting, but just calling it like it is.
I’m not after some theoretical recipe or whether fuel injection shower vs port injection makes more power as that’s not new information.
I’ve seen many times throttle body injection produce much poorer outcomes so clearly simply adding the right amount of fuel further up is not the answer as the real world is more complicated than that.
If the way to get the cooling effect as good as that of a carb involves not just placing injector at the runner entry, but also requires fully sequential fuel injection with low duty cycle injectors (25-35%) to be able to place the injection event window to conclude with high port velocity conditions which is what I’m going to try then that’s another layer of complexity I can understand many don’t want to be involved with
From what I've seen, carburetor air temps are measured in the plenum (after fuel) where an injected engine the manifold is dry (before fuel). So of course the data is going to look better for the carburetor. That doesn't tell you what is happening in the cylinder however.