Love the data Jay and the engineering conversation, we did a lot of this back when and of course along the way.
Now I am going to refine the question a little for fun. This is a very broad question. I am building a full race FE
To me, I also want some bones on the engine, car, clutch, trans, gear,tire, goal and weight, anticipated launch RPM, and if she has a tube chassis, 4 link, and all the combo info. I also wonder, race gas? alky?
Reason why is because I am thinking about ET/cost and hundredths on the time slip too.
I like a heavy Damper on a long stroke engine but at first, wondered the compression, cam, heads, and she has aluminum rods, so....
Clearly I am turning the question on it's head to round out the analysis a little
Is this a 10 second car, goal wise? 950? 900? 850? And also, how heavy a flywheel do you run, or is it a auto?
If it is a 10 second car, the mass difference will have an effect, on your ET data, but probably very small. So you might think it all through, chose a quality SFI piece, and maybe say, my next build will be even bigger and faster, and higher revving, so I think I will get something that I can use on future builds too.
No doubt the power level is key, and stroke, as you guys see a lot, a blown car that is full race let's say, tosses the damper, and lets the flange, hub, blowere belt and blower smooth away huge resonant frequencies for that 4,5,6 second blast
Power level is huge, but so is the goal. The old NASCAR type builds had to live 3,4,5 hours, and our OffRoad FE's had to live, 12,18,24 hours.
So I would refine the question too, and think horsepower/ET per dollar too
And I want to know, how hard this car likes, or needs, to hit the tire?
Here is an old fact. Remember Dyno Don's 71 Maverick with a SOHC? The Pro Stock car that won so much?
That car liked a low gear, and the tires,chassis, and leave RPM, liked more then more mass.
The 60ft and the ET, picked up, by adding heavier then heavier flywheels, and a bigger dampener
It ran best, because every race car and engine, trans, is, unique to some degree, it worked best with a custom, super duper heavy Flywheel. You guys would laugh if I told you
Reason was, he left sky high, before rev limiters, if he was on a good track, in good air and for the win. That was a 2 disc car, and the entire combo got tested and tested many ways, so having about twice the weight of a regular flywheel helped him, hit the tire very hard, get the car moving fast, and power shift real high to allow that increased rotating mass to slip the clutch on a gear shift and stay higher in the power band. Kind of a, try 10 things, and what works works thing
Man, this is such a fun thread by many smart guys.
Race cars deserve race parts, it is nice to just get the best you can budget. ATI and the others will get you to the other end and she sounds fast so NICE WORK man
Loved that chart Jay, thanks to all of you
Just rounding out the issue in case it helps him get that new dampener to the balance shop and spinning
A SOHC can run low 9s with a tricked out stock dampener, not legal, but they got 'pinned'