|
I disagree that CIS is more environmentally friendly. CIS injects fuel into all cylinders all the time no matter what. It just varies the amounts. MFI injects fuel into only the cylinders that want it, and only when the driver is on the throttle. There is a microswitch to shut off fuel when off throttle and above 1500 rpm. It is a high pressure injection, too, so the power you get out of the fuel I would say could be double the CIS.
The difference is that CIS cars are slow and slow cars are not going to need as much energy to go slow. MFI cars are fast so they need more energy. If you made a CIS car as fast as an MFI car the MFI car would get better mileage.
It is also the tuning. You can make either one rich or lean.
MFI was actually adopted for the 911T in 1969 because it was the only way to meet the emissions regulations.
__________________
1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
|