| | | quote | | You mentioned that the bolt pattern is 'offset'...offset from what? Just wondering what you mean by that. |
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The six bolt holes are not all 60 degrees apart. a few of the holes are offset so that it can only be installed one way. This keeps the imballance at the correct position. There is no imballance on the 4.9, but they still use the goofy pattern.
| | | quote | | I will have to figure out how heavy the counterweight is. It wouldn't happen to be the same as the 2.8's, would it? |
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Not much chance of that. You'll need to measure the weight and position. It would be hard to do accurately without an electronic spin ballancer or whatever the pros use because the stock flexplate does not have a weight welded on, rather it has weight removed by way of some large odd shaped holes cut out of one side.
It's rumored that you can use a nuetrally ballanced flywheel. I'd sooner do that than have the incorrect amount of weight or have it at the wrong place. The best thing to do would be to ballance the crank and flywheel as an assembly. I've seen the effects of the wrong imballance. Both cases were 3800 engines with redrilled 2.8 flywheels. The wrong amount of counterweight and/or the wrong position. The effects were pretty drastic, huge vibration and premature bearing failure.
