MSefi.com read only forum (Jan.15,2018)

This is more hypothetical at this point than anything, but assuming a fuel system designed to hold up to it, how high of pressure will conventional injectors stand up to and still work properly? I've come across various docs regarding F-1 engines, or old style mechanical injected setups, that tout superior atomization at higher pressures... I mean, fairly obviously F-1 are running bespoke injectors, but is there any reason this wouldn't work with more standard parts?

The megamanual discusses 70 psi as a point of concern for injectors.

Jack

Right, section 5.7.1 of the 2007 FIA technical regs state that "the pressure of the fuel supplied to the injectors may not exceed 100 bar." That's 1470 psi to you Anglo-units freaks...

In any case, our standard pintle valve injectors will lock up at higher pressures, because the magnetic coil can't generate enough power to open the injector against the fuel pressure holding it shut. 70 psi is the number that is usually tossed around, but testing it should be pretty easy. Just wire an injector up to an MS on the stim and start jacking up the pressure on a test fuel rig until the injector stops working.

Eric

I suppose there is that method too. I'd been meaning to come up with an excuse to pull the pump out of the Rabbit in the field...

A friend of mine has been using vw 1.8T blue injectors at 125 psi (by accident) without problems. We swapped intake manifold and injectors and found that bosch motorsport green injectors did not like faulty pressure regulator that give us a bit higher than normal fuel pressure.