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Thread: Individual Cylinder Trims + Injector Flowsheet?

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Posts: 11-11 of 11
2015-09-10 14:14:14
#11
Yes, this applies to all SR engines, FWD and in theory RWD as well.
It also applies to all inline engines with the transmission connected to the end of the engine.

If you take an inline engine like a typical 4 cylinder, or even a straight 6, you can assume the cylinders on the ends run cooler than the middle cylinders.
The temperature gradient will look like a bell curve basically with the middle cylinders hotter than the outer cylinders.

However, if you then attach a transmission to one of the ends of the engine, that will move the heat gradient toward the transmission because it is a source of heat, and acts as a heat store.
So the bell curve moves toward the transmission and you end up with the cylinders closer to the transmission being a bit hotter.

So if you average out the temps on a typical 4 cylinder engine it looks like this:


Cylinder 1 | Cylinder 2 | Cylinder 3 | Cylinder 4 | Transmission
cool | warm | hot | warm | warm



A typical straight 6 looks like this:


Cylinder 1 | Cylinder 2 | Cylinder 3 | Cylinder 4 | Cylinder 5 | Cylinder 6 | Transmission
cold | cool | warm | hot | hot | warm | warm



In general, RWD engines have even more pronounced temperature swings between cylinders because the air-flow coming through the front of the car only really acts on the front of the engine, but on a FWD configuration it can better stabilize the temps across the block and head.
Last edited by BenFenner on 2015-09-10 at 19-19-40.
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