[Shop-talk] Welding a full tank

[David Scheidt]

On Fri, Apr 30, 2010 at 4:37 PM, Mark Andy <marka at maracing.com> wrote:

> Howdy,
>
> I don't know if this really applies, but I'd also heard on the internet (so
> it must be true) that current cars have such good emissions that the old
> suicide trick of putting a hose from the exhaust into the window doesn't
> work any more.  If that's true, that would seem to imply that there's still
> oxygen in the exhaust?


A modern automobile, with functioning catalytic converters, oxygen sensors,
and so on, should have water vapor, C02, nitrogen (and some nitrogen
oxides),  low CO, low oxygen,  and low hydrocarbons.  (way less O2 than
needed to support life).

The problem is that, absent an exhaust gas analyzer,  you don't have any way
of knowing what's in the fumes.  A poorly tuned engine can have substantial
CO concentrations.

-- 
David Scheidt
dmscheidt at gmail.com