No, it won't. There is little or no benefit to pulsed injection
unless it's into the cylinder, as Bosch discovered in the 70's.
Hence the CIS -- mechanical, hence reliable, and accurate. Too
accurate, in fact -- there is no sudden throttle opening enrichment.
Benz stopped using it mostly because the US EPA insisted that each
cylinder firing event be completely controlled, even though there is
no way to tell -- even if you had an O2 sensor at each exhaust valve,
they do not respond fast enough to tell if a cylinder has fired or
not. The purpose is to shut off fuel to a non-functioning cylinder,
but no one does this. Stupid.
Anyway, a MegaSquirt on a Benz designed for point injection will
suffer from the same problems as a carb (since it's exactly the same
thing -- spray gasoline into the air flow remote from the
cylinders): the manifolds have both a number of turns and turbulent,
not laminar, flow. The gasoline gets thrown out of suspension as the
air goes down into the bottom chamber, swirls around, then goes up
and over and down into the intake valve. Works wonderfully for point
injection, since all cylinders get the same air flow on average, but
works like crap with a carb -- almost impossible to start, for one
thing, since it takes a LONG time to suck enough fuel mist through
the manifold to get it to light. Pump the accelerator pump and you
end up with a puddle fo fuel on the bottom of the lower manifold
half, nowhere near the cylinders. Terrible mixture control, and
serious drivability problems. I've seen a conversion to a Holley 4-
barrel -- worthless. Car was towed into the shop for refit to a
normal CIS.
Peter
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