WPSLPGExhaust Gas Oxygen (EGO) sensor Information

[Bruce Plecan]

Scarey as it may seem going to more cam, generally gets you more self EGRing
at low rpm.   As you rev the engine up there is even less sampling time, and
the effect of the ram does play a more dramatic level.  I just doubt that
you'd see it in response of the O2.

Just for fun:
Take a new 4 wire O2 sensor, hook it up to a power source, and just expose
it to like fumes from a cig. light, and then with the lighter lite.  Just
use a DVM, if that's all you have and watch things.  Any scope thou will
even be more damatic.

Note, to Doc:
Since the GN has a 0 overlap cam, might be interesting to compare that to a
"normal" cam
Grumpy


> Don't know the lift at 0.050 (presume inches).  The spec's I have
> specify duration at between 0.2 and 0.5mm. e.g. Kent Cams are
> specified at 0.4mm lift (around 0.015") on a fast-road 270 degree
> cam - so how much overlap does that come to? I don't know; I'd have
> to measure it to be sure.
> Assuming that I have one quarter of the numerical total "excess"
> above 180 degrees (in this case 90 degrees) as the timing for IO/EC
> relative to TDC, that puts the overlap at 45 degrees. Looks like too
> much - but then again, that's at 0.4mm lift.  Even at one-third of
> that to *approximate* 0.05" lift, you still have 15 degrees of
> overlap.
> A tuned inlet can have a pressure pulse arriving as inlet opens, and
> if that is greater than the residual exhaust pressure at that time
> (perhaps aided by a tuned exhaust) then you will get significant
> scavenging resulting in a significant amount of O2 in the exhaust.
> The amount will depend on a large number of factors.
> But the question remains; will the O2 sensor pick it up? Will it
> switch to lean?
> Maybe I should make a harness adapter and check it using a 'scope.


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