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1. 08:17 PM - Re: EBay 680FL N4998E-SN1739-141 (BillLeff1@aol.com)
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| Subject: | Re: EBay 680FL N4998E-SN1739-141 |
--> Commander-List message posted by: BillLeff1@aol.com
I have worked on the Simmons injectors for many years. All Simmons injectors
come from overhaul set 10% richer than originally designed. This was done to
improve single engine performance along with adding the large intake scoop.
When installing the injector many mechanics adjust the idle mixture to take
out that 10% and they do it with the engine hot. The Simmons injector uses
engine oil in its metering circuit to control fuel flow. So, if you adjust it to
not run rich with the engine hot it will be too lean when the engine is cold
or the oil is not at normal operating temperature.
A properly adjusted engine will run ok at idle when cold but must be leaned
for operation on the ground when the oil is warm.
In the air it takes nearly 300 pph in climb to keep the cylinders cool (215
deg C max continuous - without hurting it) and 150 pph (25 gph) to make the
cylinders last (Per Engine). Any less and you might as well carry extra
cylinders with you.
By the way, there are long and short propellers. The short props were an
attempt to increase cruise speed. this was done at the expense of take off and
climb, including single engine climb (this was not the best of ideas).
If you have a plane with small air scoops (ie 680FP or an 8000 lb.
680FL)this rich running problem is worse because you have more fuel and less air.
Bill Leff
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