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Original Message
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| RE: Machining Questions |
| By John - 03/04/2006 9:27:10 PM; IP 142.177.41.79 |
| Your machinist is probably giving you "his" honest opinion, as he's losing money by not performing these operations. My opinion is different (just as many future thread writers may have differnet opnions...LOL). I think balancing is a very good idea, especially as you have new pistons going in. Balancing is fairly cheap too. Now as far as decking the block, I would only do it if the block deck wasn't true (i.e. warped). A steeel straight edge and a feeler gauge will tell you that, although basically if the straight edge lies true and no light comes through, it's fine. The other reason, as you stated, would be for compression reasons. For iron heads, about 9.5:1 is a good CR,....for aluminum, about 10:1. You need to do some calculations with your desired CR to select the proper pistons or heads you want. Since you've already purchased everyting, you may want to use the head information (dome volume), and maybe exchange the pistons if things dont work out. If the CR is a bit high, there are thicker head gaskets available,...if too low, you need to use either different pisotns or different heads. Another good operation that's fairly inexpensive is to have the block line honed. |
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