Mark, I was thinking along the
lines of the restrictors in the vacuum lines I seen in the pile of tubing from
a couple old cars that I scraped, or maybe a 1/8" piece of steel tubing with a
drop of solder in and a hole drilled thru the solder. The aquarium valve
would sure be a simple way to make a restrictor. JohnD
John;
That’s essentially what I did,
except I used epoxy instead of solder, and used a .050 wire to form the
orifice. Then used a fuel filter as an accumulator. It improved the idle
of the engine.
I had also found that using the
un-damped MAP signal for the pressure-referenced fuel pressure regulator
caused rapid pulsations in the fuel pressure. I don’t know that this
affected engine operation in any way, but decided it could an unknown
stressing factor on the fuel system. Using the damped MAP signal
eliminated that phenomenon.
All of this is influenced by the
location of the MAP measuring ports. Mine is picked up relatively close
to the ports (about 6”) and would likely have stronger pulse than if picked up
in an air box at the far end of long runners.
Al
G.