Ernest,
Your EFI fuel pumps have a check valve in them and will hold regulated pressure
for a long time or until leaky injectors relieve this pressure..........Short of replacing
the injectors the fix is to put a pressure relief orifice from the fuel pressure line to
the fuel return line......This is the band-aid fix commonly used for hi-milage RX7's
and "Mazdatrix" even sells a kit for this (I made my own for my 88 Rx7).............The
orifice needs to be small (I think I used 0.020).............The fuel pump has enough
excess capacity to make up for the small amount of leakage when the engine is
running...........Make the orifice very small...........I bought a kit of micro sized bits
from "Harbor Freight Aircraft Supply"........<:)...........Mark Steitle did this for leaky
injectors on his 20B..........Jump in here Mark.........Do you recall what orifice size
you used ??..............
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
From: Ernest Christley <echristley@nc.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Friday, July 1, 2011 11:23 PM
Subject: [FlyRotary] Leaking injectors?
I was installing a coolant overflow bottle today, working right next to the intake manifold. Kept smelling gas. Then I noticed a little
puddle inside the little depression formed by a modification I just added. The new fiberglass didn't have any paint on it, so that is why I could see through it. There was maybe an ounce of gas floating around in the bottom of the manifold.
Could I have been running so rich during my test run that an oz of gas was left on the manifold walls? Or could it be that it dripped through a leaky injector, even though I shut down by switching off the fuel pump in order to relieve line pressure?
I know some others have had problems with leaky injectors. Does anyone have an idea for making them not quite so leaky?
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