Forum Discussion
wilber1
Jun 25, 2015Explorer
ShinerBock wrote:wilber1 wrote:ShinerBock wrote:wilber1 wrote:ShinerBock wrote:
The Jeep 4.0L was an over-square inline six along with even larger displacement inline six prop plane engines, but that is neither here nor there since it is the bore/stroke ratio that determines when an engine reaches peak torque and max engine speed, not cylinder configuration. I don't see why this is so hard to understand.
When did the Jeep 4.0 become a high performance engine?
Where did I say that I was only talking about high performance engines? IIRC, I was talking about how the bore/stroke ratio effects when an engine gets its peak torque and max engine speed of ALL ENGINES . I don't recall limiting what I said to just performance engines.
You were the one who brought up the Supra. My point is that for the 6.7 Cummins to be a square engine it would have to be 5 inches longer just to accommodate the larger bores.
I brought up the Supra engine as an example of an over-square inline six. I don't understand how me using the Supra engine as an example of an over-square inline six automatically means that I am only talking about performance engines.
Again, and I do not know how to say this to make it simpler, the bore/stroke ratio is what effects when an engine reaches peak torque and its max engine speed, NOT the cylinder configuration. It doesn't matter that you have to make the inline six 6.7L under-square to get to fit because it is not the fact that it is an inline six that makes it have low peak torque, it is the fact that it is under-square. You can decrease the stroke and increase the bore on the same inline six 6.7L and you will change when it reaches peak torque. I really don't know how many ways I can say this to make it easier to understand.
I don't dispute that it is the bore/stroke ratio, what I am saying is that design limitations dictate that large displacement I6's be understroke engines. The Supra example is a small displacement engine and is not relevent to this thread.
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