Roush vs 427FE vs Keith Craft

[Dimis]

Originally Posted by AL427SBF

Thanks CobraED, we get the science but Brent not so much.
Nor does Brent know what the word generalization means, but so be it.

Brent, it is clear you can't breakaway from your trick engine builds which are clearly not in family with the majority of engine builds. Your dyno charts are a good example of this, you start recording at 3500 or 4000 RPM and have stated loading the engine at lower RPMs "will suck the guts out of the motor" ... enough said.

Revving faster is not a difficult concept to grasp, time to a given RPM is all it is.

Here's a curve ball that I expect will have you scratching your head for some time. Take a figure skater who has started a spin with both arms outstretched and one leg. Did you catch the Sochi olympics? The energy put into that spin will dictate the skaters RPM based on the rotating mass of that skater. Now that skater pulls in the arms and leg and WHAM quadruple the RPM! I'm also willing to bet that skater didn't loose any weight during the spin. Your bob-weight argument has some relevance to the big picture but not much, and you don't understand mass versus weight. In this case rotating mass = how that weight is distributed from the center axis of rotation and is a huge multiplier of RPM as shown by that skater who decreases rotational mass by pulling in the limbs.

I know you won't get it, I don't expect you to get it, but thank God there are engineers out there putting that simple law of physics to work for us everyday.

Oh brother... Why so antagonistic?

From my reading Brent is not challenging the laws of physics, just the simple fact that this one law stand alone is not the sole and only reason that results in an engine reving faster.

Therefore to conclude "that" as a general statement of fact would be erroneous, as you'd be omitting other influencing factors.

At least that's how I've read it.
Clearly Ive read it differently to you.

[blykins]

Originally Posted by Dimis

Oh brother... Why so antagonistic?

From my reading Brent is not challenging the laws of physics, just the simple fact that this one law stand alone is not the sole and only reason that results in an engine reving faster.

Therefore to conclude "that" as a general statement of fact would be erroneous, as you'd be omitting other influencing factors.

At least that's how I've read it.
Clearly Ive read it differently to you.

That is true. There is more to it than an example of a figure skater. He is right that the less weight you have slinging out there (skater's arms and legs) makes for a quicker revolution, but what everyone is ignoring because of either pride or ego is that you can't say that all small blocks will out rev all big blocks.

I can't understand why that point is so obtuse.

Do you all realize that some big block rods weigh less than some small block rods? Or some big block pistons weigh less than some small block pistons? Or that the ring tension on a big block can be less than the tension on a small block ring pack? What happens when one engine has more parasitic drag than the other through piston to cylinder contact?

You do not need to look at an exotic build to see these things either.

There's a whole lot more to it than an example of a figure skater.

I still don't understand what all the hub-bub is about. I actually agree that most big blocks seem lazier than the small blocks.

However, you can not make the generalized statement that "a small block will out rev a big block." That is simply not true due to a myriad of variables especially when you consider the larger Windsor combinations.

[AL427SBF]

Originally Posted by blykins

... but what everyone is ignoring because of either pride or ego is that you can't say that small blocks will out rev big blocks ...

Another one who doesn't understand revving faster or what general rule of thumb means.

[patrickt]

FWIW, I had my FE specifically built to be, in my uneducated words, "a quick revver." The builder went with a slightly shorter stroke, and all light weight stuff that cost a bit more, like Wiseco, and what not. Light aluminum flywheel, 3.54 rear, and she's just what the doctor ordered....