AFM measurement/backpressure (was Turbo speed sensor)

[Eric Aos]

> >> EGT is significant; the energy in the recirculated exhaust gases 
> >> will increase the possibility of knock as the total energy of the
> >> mixture is higher than with all fresh mixture.
> 
> >EGR, is low in O2 content, so how is it's total energy higher?.
> 
> It's hotter.
> 
> The total energy of the mixture in the cylinder is higher.
> 
> The exhaust gases are at 400C or more. The fresh air is at maybe
> 100C with a turbo and inter-cooler. Therefore the total energy is
> greater at the end of compression, prior to the start of combustion.
> 
> You start with a hotter mixture, so you need to compensate for that
> to avoid knock.
> 


Let me get back on my chair... somebody better tell John Force he's been
goin about it all wrong. If he just gets someone to pump some hot inert
gas into his motor he'd go a bunch (technical term) faster.

The whole point of EGR is to reduce the efficience of a motor. Heat is
relative, warm burnt exhaust is cooler than fresh fire.

Eric Aos
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