Injector Flow Variation

[Robert J. Harris]

Remember the Reichstag

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> From: tom cloud <cloud at peaches.ph.utexas.edu>
> To: diy_efi at coulomb.eng.ohio-state.edu
> Subject: RE: Injector Flow Variation
> Date: Monday, September 09, 1996 6:44 AM
> 
All things mechanical - there will be a flow variant - hopefully
small.  Bad things like detonation events occur first in the 
poorest mixture quality cylinder, thus the whole engine is 
limited by the weakest cylinder.  SFI with only an oxygen 
sensor feedback loop adjusts based on an all cylinder 
composite oxygen reading.

The next step is to use a quality industrial temperature 
measuring device (thermocouple, RTD's) to measure Exhaust
Gas Temp at each individual port, and wire them so that rather
than showing absolute temperature, the device's would show 
temperature differential's between cylinders.  

All things being closely approximate - (e.g. cylinder volume, port
air flow, cooling capacity, etc.) the proximate cause of Exhaust
Gas Temperature variation will be mixture variations induced by 
injector flow variations.  Using the differential EGT data, each 
cylinders mixture could have corrections applied thereby  
finely tuning out all differences between cylinders and making more
power and economy by operating closer to detonation limits without
increased risk.  Course, now I'll have to prove that EGT temperature
is a dependent variable based on combustion mixture - ignore 80
years of A/C's watching EGT when adjusting mixtures - but oh well