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Original Message
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| I'd have the bottom end balance checked. |
| By Dave Shoe - 03/10/2001 12:19:31 AM; IP 216.243.158.72 |
The rods appear to have been lightened a bit while being balanced, as you mentioned the balance pads are ground down further than stock.
If the assy was rebalanced when the rods were ground, some metal would have tyo be removed from the front and rear counterweights to compensate.
Internal balancing is mainly only done to the rear counterweight in a 410/428 (non SCJ) because the front half of the crank is internally balanced at the factory. Internal balancing requires the ADDITION of heavy metal slugs to the counterweight, so if there is no evidence that the counterweights have caps welded to encapsulate the heavy metal, they have not likely been internally balanced.
If lightweight pistons and rods are used, however, it is possible to reduce the reciprocating weight sufficiently to eliminate the need for the rear counterweight. I doubt this is the case.
As it's a new motor and you'll probably want to get a buncha miles out of it, I'd pull it apart and bring the crank, rods, and pistons (with rings and bearings and flywheel) to a balance shop. Ask them to "inspect" the balance. It's a lot cheaper than actually balancing the assembly. This is also a great time to get a sonic mapping of the cylinder walls.
If all looks OK, then you can reassemble with confidence, and you'll also know what the guts of the motor look like, and also learn whether it was assembled correctly when you bought it. This is important when your mashing the throttle. If it's a little (or a lot) off balance, then you can pay the few extra bucks and get the job done right.
As for stock iron FE flywheels: They're rather brittle and dangerous. When running a stick with a performance FE, you really need at least a steel flywheel. A blowproof bellhousing becomes important as the power and revs climb from there. If you must run the iron, be sure to use a blowproof bellhousing.
Shoe. |
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