Great 2 part interview with Tony Rudd

[LGAFF]

"To our delight, we ran the first engine May(1985) and it worked. We had been running in parallel: we had shipped one of our 4 liter engines to Detroit, and we mocked up the induction system we'd plannned to use, which saw the two inlet ports and one inlet port is throttle. The whole induct system is mocked up on one of our V8s. We can show you the engine-we've preserved it. We think it's a piece of history.

And that was when we coined the phrase that it's got 11 throttle butterflies and 16 injector nozzles. That was the week we had to go down to talk to AC Rochester about the link for the injector nozzle."

Tony Rudd

[Hib Halverson]

Originally Posted by Paul Workman

Thanks for that Hib. I wonder why they didn't go to a variable fuel pressure approach to the low speed, big volume injector issue? Maybe they did on the next gen of the LT5, as it had only one injector.

P.

I can't remember what they were going to do on the still-born 96 engine with VVT. I'm embarassed that I can remember as I've talked to Graham several times about it over the years, but by 1992, when they were developing the 475-hp engine, it's possible there was an injector out there which both flowed enough and could be controlled at small pulse-widths.

As for the LS9 in the 3G ZR-1, yes, it does have variable fuel pressure levels....three of the, in fact. A fuel system control module changes pressure to fit fuel flow demands.

As to why that couldn't have been done 25 years ago? Uh well...the technology didn't exist. Even if there had been an AFPR which could be changed rapidly enough, the control system would have been an even bigger challenge.