Quote:
Originally Posted by ian c2
Hey Niel
Is this temperature affecting pressure once the engine is running , or a mechanical thing that you are seeing on the bench as the engine is assembled ?
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The easiest (actually the hardest) performance to find is trying to equalize the performance from each cylinder. In these engines we have calculated at least 10 -15 HP difference in all of these cylinders. That is collective. Seems like an easy upgrade.
Temperature has an effect for sure as does air flow through the manifold. Other friction factors play too. Understanding where and what is causing this is a never ending goal. Seems it all changes from model engine to another as well. It would be way too simple if they were all the same.
I am trying to understand these earlier smaller displacement engines as any added performance would make a huge difference. Measuring cylinder pressures, temperatures amongst other data recorded is a start.
We have developed/tested an application of a different cylinder wall coating on a 997 GT3 engine that has proven to be very successful in lowering the ring friction. I'm hoping this will transfer over to the air cooled cylinders but we first need to understand how we can pull the lower performing cylinders up to the performance levels of the other cylinders. These are very simple engines but still have complex issues I don't fully understand.
You can keep trying ways to add performance to these early engines, but its like "feeding a dead horse". Soon than later you figure out, it wont get up.