[Diy_efi] a/f #s, was What is stoichometric....really?

[Grant Beaty]

Are the sensors & WB controllers (I have a FJO, but from what I understand
the FJO, a working DIY, and a dynojet WB all read the same) really accurate?
I know the info is repeatable - which is all that really matters - but I
have a hard time believing when my FJO (which has been tested against other
FJOs) reads 11.0:1, I'm really moving 11 times more mass of air than fuel.
At that level (100% duty) the engine would be moving 56 lbs/min, which
doesn't seem likely at all for a 3L motor running 19psi with stock cams, a
log-style exhaust manifold only spinning to 6800. Using optimistic VEs #s, I
calculated 46 lbs/min at redline. Thats with a ~1.1:1 pressure ratio of
exhaust manifold pressure vs. intake manifold pressure (I haven't tested
exhaust mani pressure at 19 psi, so thats just a estimate).

Grant

-----Original Message-----
From: Phil Lamovie <phil at injec.com>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Wednesday, October 23, 2002 2:14 PM
Subject: Re: [Diy_efi] What is stoichometric....really?


>
>Derek wrote...
>
>> Someone on another forum suggested that the actual NOx gases can
>cause engine
>> damage over time. There any truth to this? Because I have the power
>to run at
>> any AFR I like, and would like to start using 1.1 under light load
>conditions if
>> it really is more efficient as you state, and doesn't cause any
>harm.
>
>Best thing to do in this case is to get an explanation from the
>person making the claim. It is much easier to check the physics
>or chemistry than it is to simply say "not true"
>
>The parts of the engine that are exposed to NOX are the pistons
>and rings, the head and the valves (and the guides) and the
>exhaust system.
>
>There of course would be some NOX in the sump as a result of blow by
>and thus it would over time come into contact with the lubrication
>system.
>Therefore it has the capacity to "touch" almost every component of the
>engine.
>
>From the other end of the scale, I know of no "known" issues.
>
>Perhaps it's a fuel additive issue or something of that nature.
>
>The warranties on new lean burn engines is around 150,000 kms
>these days so my suspicions as to the extent of possible damage
>is low.
>
>HTH
>
>phil
>
>
>
>
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