I have a M103 powered 300e with CIS-E and am looking to get maximum performance out of an MFI system even if modified instead of just going MS3 and EFI. I have a two barrel carburetor I made an adapter plate for to run my original intake on my 1989 300TE with just the air meter and fuel distributor removed. It still retains factory ignition and distributor and runs quite well just a little rich.

I was curious if anyone has ever tried to eliminate the air flow meter and instead replace it with a mechanical barrel valve style regulator to the throttle linkage like of an older style MFI system. The barrel valve is usually hooked to a distribution block which has the lines going to the fuel injectors and the barrel valve just controls the return to the fuel tank which relieves pressure in turn control injector flow and the air fuel ratio at the given throttle input. The old system were basically on/ off systems but with proper bypassing people have adapted them for street use. With this theoretically you would be able to run ITB’s as long as linkage still references barrel valve or maintain the factory manifold with a similar setup. These systems were constant flow such as CIS-E so you could probably even try to run the distribution block to factory Bosch injectors. I am just trying to ping this idea out there to see if anyone else thinks it would be possible to run such a fuel system with a larger cam and modified ignition curve. I’d really like to pull the maximum amount of power out of my M103 without going EFI or forced induction.

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Mercmob Car Club Milwaukee