Finally finished setting up the car suspension. It’s still not perfect but its a lot better than it was originally. With the suspension completed I thought is was about time to take the car to a rolling road to get the carb set up correctly. This went fairly well but highlighted a fueling issue above 4000 rpm. If you look at the rolling road print out you will see that the AFR (Air Fuel Ratio) increase from 13.2 to 15 from 4000 to 5500rpm. The ideal being 13.2 for acceleration. There could be 2 reasons for this, one being the mechanical fuel pump can’t deliver fuel quick enough or the main jets are too small. As the carb has the recommended jet size fitted it is most likely caused by the fuel pump. As the rolling road didn’t have the next jet size available we were unable to confirm the exact cause.
My plan now is to fit an electric fuel pump and then I will return for another rolling road session. I will also be taking the next size jets with me just incase the electric fuel pump hasn’t fixed the issue. As for my engine the performance it is spot on at 130BHP which is exactly correct for an early Essex V6 engine fitted with the standard oval port heads. I am tempted to fit an up rated engine but this is defiantly a project for another year as upgrading the rear axle first is more important for me.
One photo below shows how the track rod end is attached to the steering arm. I plan to have a spacer machined to replace the temporary spacers was I’m confident that no further adjustments are required. The other item is a scan of my rolling road session for the Marcos car.
