Stock/Super Stock Teardown @ Indy

Alan Roehrich · 08-11-2010, 08:06 PM

Stock and Super Stock have rod and piston assembly weights. While there will be some variation depending on where the weight is exactly in a rod and piston assembly, that weight gives you a reasonably close approximation of the bob weight and thereby the counterweight. The rules on crankshafts and how they may be modified will then give you a close enough approximation on the weight of the crankshaft.

If you cannot "gun drill" journals, or "pendulum cut" the counterweights, and you have a given rod/piston assembly weight, you'll have reasonable control of crankshaft weight without removing the crankshafts. The reason being, if you cannot pendulum cut the counterweights, you're stuck with the heavier full profile counterweights, and that's where a lot of the weight is. Especially if you cannot gun drill the journals.

If you get caught with profiled or pendulum cut counterweights in Stock, or the traditional Super Stock classes, you will be disqualified, and you will be suspended. It has happened within the past couple of years. There have also been suspensions for violations of the assembly weight rules.

And no, I don't think they'll force people to pull their engine out and remove their crankshaft to weigh it.

08-11-2010, 08:06 PM	#8
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,826 Times in 414 Posts	Re: Stock/Super Stock Teardown @ Indy Stock and Super Stock have rod and piston assembly weights. While there will be some variation depending on where the weight is exactly in a rod and piston assembly, that weight gives you a reasonably close approximation of the bob weight and thereby the counterweight. The rules on crankshafts and how they may be modified will then give you a close enough approximation on the weight of the crankshaft. If you cannot "gun drill" journals, or "pendulum cut" the counterweights, and you have a given rod/piston assembly weight, you'll have reasonable control of crankshaft weight without removing the crankshafts. The reason being, if you cannot pendulum cut the counterweights, you're stuck with the heavier full profile counterweights, and that's where a lot of the weight is. Especially if you cannot gun drill the journals. If you get caught with profiled or pendulum cut counterweights in Stock, or the traditional Super Stock classes, you will be disqualified, and you will be suspended. It has happened within the past couple of years. There have also been suspensions for violations of the assembly weight rules. And no, I don't think they'll force people to pull their engine out and remove their crankshaft to weigh it. __________________ Alan Roehrich 212A G/S