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Old 24-12-2015, 06:32 AM
jondee86 jondee86 is offline
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Join Date: Dec 2015
Location: New Zealand
Posts: 78
Thumbs up Re: JET PLACEMENT FOR AIR FLOW (POST-MAF)

Very interesting !!!! I had been looking for some flow analysis more relevant
to the conditions in an intake manifold, but must have been looking in the
wrong places.

I had also been giving some thought to the reasons why fuel injectors are
aligned to spray with the airflow, whereas misting injectors are invariably
installed at right angles to the airflow. Your picture actually explains the
difference quite well. Fuel injectors have a narrow angle jet with a greater
mass (more concentrated), so the jet will penetrate the airflow and impinge
on the opposite wall. Misting jets have a wide angle jet with lower flow and
less mass, so the droplets are swept away by the airstream before there is
any (or little chance of) impingement on the opposite wall.



On the 4AGZE engine, once the wiring conduit under the fuel rail is removed,
there should be the opportunity to place port injection nozzles in the top of
the inlet runners. Some nice low-profile right-angle nozzle holders should
fit in there without getting in the way of anything. I would anticipate using
one other nozzle (after the throttle) in the inlet ducting before the charger.

The injectors are in the head which means equal fuel distribution is assured.
That only leaves the puzzle of how to obtain equal air distribution in the
rather unusual non-symetrical runner layout

Cheers... jondee86
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