Back pressure and torque
John Hess
JohnH at ixc-comm.net
Thu Aug 28 19:43:48 GMT 1997
Place a quick call to John Lingenfelter.
> ----------
> From: Corey L. Cole[SMTP:corey.l.cole at boeing.com]
> Sent: Thursday, August 28, 1997 12:39 PM
> To: diy_efi at coulomb.eng.ohio-state.edu
> Subject: Re: Back pressure and torque
>
> John Hess wrote:
> >
> > I DID go to the books. Back pressure (and flow) effects the exhaust
> > temperature. The exhaust temperature of a free flowing exhaust can
> have
> > an effect on the O2 sensor, since most depend on the exhaust to heat
> > them up into their operating range. I have consistently had
> troubles
> > with cars with header systems not going into closed loop, simply
> because
> > the O2 sensor didn't get hot enough. That is why I now install
> > electrically heated O2 sensors on cars with headers.
>
> I always thought that the problem with O2 sensors and fabricated
> manifolds
> was that the thin wall tubing rejected heat much faster than the cast
> type.
> Furthermore, I'd also heard that ceramic coatings and thermal wraps
> can
> alleviate or eliminate those problems (plus keep you engine
> compartment
> cooler)
>
> --
> ======================================================================
> ========
> Corey L. Cole | I was standing on the side of the
> road,
> M/S 19-HH | rain falling on my shoe.
> E-mail: corey.l.cole at boeing.com | I was heading for the east coast,
> Phone: 206-662-3596 | Lord knows I've paid some dues.
> | Tangled up in blue.
> ======================================================================
> ========
> Disclaimer: If I'm not speaking FORTRAN, I'm not speaking for Boeing.
>
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