Stroker specific cams?
But, but, but.... that is what the Thumpr cams do..... oh wait, that IS stupid LOL.
The 2nd part took me a while to grasp.... but I assume you mean that since the wider LSA moves the exhaust pull-through RPM's up, then the same duration moves the whole RPM band up...but you'll hit the physical RPM limits of the engine (oiling limits or valvetrain float) and have a narrow RPM range due to that. Is that right?
Yes. And a wider LSA will hold power much longer after peak. That's why you see wider LSA numbers for a powerglide car than you would with a TF or some other 3 speed auto. Add in a 4 speed or better yet, 5 gears and you can move the timing around and get the power to fall off past peak like a cliff.
I wish I would have exercised my patient muscle when I did my engine. I just got tired of it and skipped the dyno. I broke my own rule. Now I'm paying for it.
My *** dyno says I make peak power somewhere around 6700ish. By 7100 it's all over but paying the dude his money because if I over rev it, it falls on its face. Not from valve float, just the power curve falling off the edge of the world (a little Sabbath reference for the older crowd).
As because my LSA fell at 105 and I said leave it IF it won't change the curve in the middle. Jim (at Racer Brown) said it just won't pull past peak very much.
So I either need to nail the shift points (which adds complication to clutch tuning) or it will be dead slow.
So that's what I'm trying to get across. Evidently, for the most part, I'm failing.
I'd rather get the cam timing where it needs to be, and let the LSA fall where it is, than to move the timing around to achieve some perceived need. It's almost never about peak power. It's under the curve.
The other thing, like all tools, the dyno has its limits. A water break dyno (as opposed to an inertia dyno) controls the rate of acceleration. IOW's, a water break dyno can't measure an engines ability to Rev. And if you think about it, the ability to RPM, to pull back from the shift point is all that and then some. Even driving on the street. And low throttle openings. Since the WB dyno can't measure that one really important statistic, you can get fooled.
I've spent some time on an inertia engine dyno. In fact, I worked for a fat, lying, thieving SOB that let me order what became the Revoltution Dyno and then screwed everyone including his mother and then ran to New York like the criminal he is. So I've spent time with different dyno's and you need to know the limitations of each.
