Building Chevy 4.3 liter V6 - 1994 with balance shaft
(→CRANKSHAFT - PREPARATIOn) |
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Next thing will be the crankshaft. | Next thing will be the crankshaft. | ||
| − | === CRANKSHAFT - | + | == 2017-12-01 CRANKSHAFT == |
| + | It took the better part of the year to do other stuff and work on other projects like a 1963 Studebaker AVANTI. My friendly machine shop had me read the user manual on the balancing machine and showed me how it works. Then it took several evenings setting up the machine and get a first balancing run to figure out if we can modify the crankshaft from external to internal balance. | ||
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| + | === BOB WEIGHTS === | ||
| + | Setting up 6 bob-weights at 0.05 g was just the beginning. The next step was an introduction to the balancing machine and I could balance all the bob-weights in order for them to spin round to 0.1g as well. This was done on a rotor shaft. | ||
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| + | === CRANK - 1st RUN === | ||
| + | Then we sat up the balancing machine for the crankshaft, fixed the bob-weights and did a first spin to see what the imbalance was. | ||
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| + | Turns out there was a 170 g at the end of the crank and 70 g at the nose of the crank. Exactly where the factory had drilled the counterweights of the crankshaft. As the JE-Pistons are lighter we decided that it would be possible to balance the crankshaft as an "internally balanced" assembly. | ||
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| + | Taking all the weights off and the next steps would be to add material to where it had once be drilled away. | ||
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| + | === CRANKSHAFT - PREPARATION === | ||
We have straigthened the cranksaft and in these mid September days I got a couple things done on it. Put it on the lathe and had all the oil holes chamfered. One side of these holes is normally paper thin and sharp. Just used a Dremel to radius them, then polished all the holes. | We have straigthened the cranksaft and in these mid September days I got a couple things done on it. Put it on the lathe and had all the oil holes chamfered. One side of these holes is normally paper thin and sharp. Just used a Dremel to radius them, then polished all the holes. | ||
Next step was to cut down on all the sharp edges on the counter-weights and throws. The removal will facilitate the work with the crank (no more cutting your hands) and the overall removal of 5 grams will not hurt balance. | Next step was to cut down on all the sharp edges on the counter-weights and throws. The removal will facilitate the work with the crank (no more cutting your hands) and the overall removal of 5 grams will not hurt balance. | ||
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