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Here is some food for thought for you turbo
folks. Most of the pressure referenced fuel regulators regulate the fuel
rail pressure on a 1:1 ratio with the manifold pressure change. In other
words if the manifold pressure changes 1psi (2" HG) the fuel pressure changes 1
psi. This increase does of course increase the rate at which the fuel will
flow through the injector. However, the flow rate changes on the order of
the square root of the pressure increase (as best I recall).
This means if you double your fuel pressure you Do NOT double your fuel
flow.
With higher boost pressures the preferred
regulation ratio is like 12:1 or 12 psi for each psi of manifold
pressure. Not certain that for the lower boost levels being used in
aircraft whether this is really significant - but, just though I would pass
this on in case anyone wants to investigate it further or
comment.
BLOX
FMUs
The Blox fuel management unit is designed to increase the fuel
pressure as the pressure in the intake manifold increases. The Blox FMU is a
universally design product with a 12:1 fixed ratio. The FMU is used on fuel
injected vehicles, either supercharged or turbocharged, using the factory
electronic engine management system. Blox FMU’s are available in blue, red, gold
and gun metal
Ed
BXFU-00400_m.jpg
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