Kelly Troyer wrote:

Paul, over the last year there were few people complained about
dribbling injectors after shut down. I wander if it is healthy to have
standing gasoline in the plenum, which can happen in the one you are
showing? I'm thinking about the possibilities of a big BOOM! :)
I made sure my injectors and runners face downhill towards the engine
ports. On my engine also the original injectors were oriented to face
downhill. What do you think?
Bulent

How does it help to face them down hill?

Paul Lamar

Matt Prather wrote:

I'd rather have the gas stay in the plenum than soak/clean
the innards of the engine. If the fuel sits in the engine
there's a better chance of corrosion in the places where
the fuel washes the oil coating from the parts.

In old CIS mechanical injection, leaking injectors were
one form of failure - replace when you find that. I suspect
modern injectors are the same.

Regards,

Matt-

    Group,
        One way to address leaky injectors ( a common problem with high
mileage RX7's ) is to put  a bypass between the pressure side of the fuel
pump to the fuel return line after the fuel regulator . A .020 +/-  oriface will
bleed off the fuel pressure (35-40 psi) after shutdown and prevent or
severely reduce leakdown and potential flooded start and/or the possible
washdown of lube from rotors and housings. As Mark Steitle has noted
previously this fix also provides a way to purge the lines of air after
running a fuel tank dry which causes a air lock in the fuel system . The
fuel pump has plenty of excess capacity to compensate for the slight
loss of pressure during normal operation. FWIW

Kelly Troyer

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