[TR] TR3 Engine Vent

Randall tr3driver at ca.rr.com
Fri Sep 21 22:51:12 MDT 2007


> This sounds like an oversimplifacation, but still I am 
> wondering if one's 
> 'HCE' goes down according to how efficient the combustion is? 

Perhaps a better way to put it is that incomplete combustion results in HCs
in the exhaust.

>  And is this 
> the same thing as saying 'how well tuned the engine is?'

Not really.  Mixture plays a relatively small part in HC emissions unless it
is so far off that it causes misfires.  As long as the mixture is somewhere
in the ballpark, and the ignition system is in good shape, then HC will be
relatively low.  

Getting it lower usually involves design changes to the engine (for example
reducing nooks and crannies in the combustion chamber, like the space
between the top of the top ring and the piston head).  Or of course a
catalytic converter that can burn the HCs to H2O and CO2.

Randall


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