[steve25]

Peak torque always takes place in any NA motor once the limit the camshaft sets on air flow is reached, this of course assumes that the heads , intake and carb are not the cork in terms of minimum port area yet or cfm.

So to me this spread being discussed of being too wide is not so easily carved in stone.

[Steve C.]

A non expert opinion here, I was suggesting what I thought might be a normal rpm spread between peaks.

Here is one comment that relates....

"I'm trying to understand why some engine have a wide power band between hp peak and tq peak and others don't."


https://www.speed-talk.com/forum/viewtopic.php?t=3549


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[Jay S]

Originally Posted by Steve C.

A non expert opinion here, I was suggesting what I thought might be a normal rpm spread between peaks.


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Would probably need to see a full graph and more drive terrain details to really give more of an educated guess on what the spread actually is or why it is that wide. Wheel dynos seem like they are hard to compare numbers between other combos or dynos. It could be the torque converter multiplied the torque for a bit at a that lower rpm and the engine’s actual peak tq was higher. If it was on an engine dyno the peak tq and power would more than likely come out closer to a that 1500 spread like your suggesting.

[Steve C.]

Makes sense, thank you.

And I can relate to your comment about wheel dynos being hard to compare numbers. When I converted to direct port fuel injection on my 505 we were unable to use the engine dyno for the numbers. The dyno facility is not set up for the fuel injection. But for interest I put the car on a chassis dyno. The results were very confusing !



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