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Originally Posted by Ford Rocam  Cannot say it can vary from engine to engine it wont be that high with a rich mixture but temp will be high with a leaner mixture the best way is to hook up EGT gauge & check for temperature readings. |
True, it's confusing man for me. It seems the combustion temperatures are high at lean AFR, peak combustion temperature is maximum at stoichiometric and then drop down at rich AFR. This it seems is because at lean AFRs there is a slow burn, which allows the heat to soak into the cylinder components. But at stoichiometric it burns really fast, so though PCT is max, combustion temperatures are lower than lean AFRs.
One thing though, at lean mixture, there is excess of air so doesn't that provide a cooling effect more or does the excess fuel at rich AFR provide higher cooling effect because it has higher specific heat capacity?
But the EGT at lean AFR is low, but increases with rich AFR, right?
Coming back to IAT signals. IAT signals to the ECM as an output voltage, so only thing to change that signal would require a resistance, in parallel, I think.
These Throttle Body Spacers definitely seem scammy to me. Firstly they claim to increase intake velocity, which without change in cross-sectional area, I don't know how they plan to achieve. They also claim to increase swirl and atomisation. How? Unless the car has a TBI setup, it won't increase atomisation of fuel, right?. Swirl at TB won't be effective unless mixed with fuel, that happens further down the intake runners, right? So all it does is add some length to the setup, which is beneficial how? Please correct me where I'm wrong.