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  #11  
Old 04-10-2018, 10:08 PM
pbf777 pbf777 is offline
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Caveat Emptor......... somehow I'm under the impression that most, if not all of individuals viewing this forum subject are shall we say, not "spring chickens" to reasonable purchasing practices; and I do also accept that I would be advised "not to hold my breath" expecting you to be a purchaser here (do you own or in need of this product?).

As already discussed here, the "compression height" is not necessarily used to control the compression ratio (although it will effect such), but rather for reasonable positioning of the piston in the bore relative to the block's deck surface. And this value maybe above, below or equal to the block deck surface depending on intention (see engine builder).

Piston weights are also a topic of concern between the effects one may wish to address in the sum values of the reciprocating mass, and potential cost concerns incurred if one ventures to far from the standard. Sometimes, the necessary endurance requirements may cause a piston & pin to weigh more, so yes, heavy or Mallory metal may be required (BTW my personal record for the number of pieces required was 23 in a single crankshaft!) Most engine builders in performance applications prefer to have the pistons lighter than standard, for reduced inertia and loading on the bottom end components and generally simplifies the balancing process if not excessive. The rebuilder prefers pistons closer to the original sum because often the rebalancing effort, if any at all, needs to be minimal for costing reasons. (confer with your engine builder!)

Again, these are custom pistons, manufactured to ones' own specifications (yes, with some limitations of deviation of course), permitting latitude in specific dimensional sums to fit one's unique application. And, since this is not cookie-cutter product I would not expect, nor advise, anyone to to just "plop-down" money and order such without communicating first!

All of these subjects are only being glossed over here, yet well understood by the knowledgeable, professional engine builder who if not ones' self, you need to communicate with and contract.

And, I understand that some are not experienced in potential if not inevitable failure of the cast Hypereutectic (aka. HYPEREXPLOSIVE!) product but............

Scott.
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