Latest post of the previous page:
Mine is working lovely around 2.5-2.8psi. I have not noticed any overly-rich hot starts, nor any spike in CHTs in long third gear climbs. I have not, however, climbed at 4,000 RPM for more than three miles at a time.hambone wrote:How is that 2.8 PSI working out? I don't like it.
This same engine on my old dual port was run at 5psi for a long time. Hot starts were maddeningly rich, but I do think that there is more to it than JUST the reduction of fuel pressure. The new engine runs with the surface temp of the fuel pump, case, and carb/manifold cooler, so there is less boil-over due to heat. There is also a new needle valve in the carb, so I think bets there are off too.