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Old 12-18-2009, 10:43 PM
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Taking weight off of pistons.......

Building a SBC 350 and using hyperutechnic pistons(flatops) Since the assembly will be balanced anyway I want to remove weight from pistons without weakening them. Where on the piston is the best place to do this?
I used the search feature and couldn't find anything about lightening stock/stock replacement pistons. Only buying light-weight pistons.
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6sally6

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Old 12-18-2009, 11:29 PM
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Reason you can't find anything on it is it is a bad idea, very risky . Piston companies don't simply make them heavy because want to, there is no excess metal in them that doesn't need to be there. Pistons are designed with their different thicknesses of material in various places to control the way they expand and to maintain their integrity under the heat and forces they are subjected to.

Other than minor amounts taken from the fat areas of the pin boss for balancing purposes you are really, really rolling the dice tryimg to lighten pistons. If you want light pistons you should buy them that way, so that they have the proper amounts of material where it needs to be.

It is bad enough to try this with forged pistons, to try to lighten hyperpathetic or simple cast pistons you would be building a hand grenade with the pin out before you even run a race with it.

If you want to lighten something, lighten the car. Get it lighter than the rules allow, much lighter, so that you can put weight back in as ballast where the car needs it to handle and bite the best.
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Old 12-19-2009, 12:26 PM
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Quote:
Originally Posted by 6sally6
Building a SBC 350 and using hyperutechnic pistons(flatops) Since the assembly will be balanced anyway I want to remove weight from pistons without weakening them. Where on the piston is the best place to do this?
I used the search feature and couldn't find anything about lightening stock/stock replacement pistons. Only buying light-weight pistons.
Thanx
6sally6
I agree with ericnova72, this is a high risk adventure best performed if at all by people with lots of structural materials experience with the expertise in using finite element analysis programs on their CAD/CAM computers.

The piston not only needs strength, it needs it in specific places and ways. Not only does the mass in locations of the piston need to resist the forces and temperatures of combustion and the dynamics of instantly changing directions, but the placement of material also controls its shape as it heats and cools.

To just remove material will weaken it and certainly will cause its shape to distort with temperature changes from that which is needed to react skirt loads and keep the rings in wall contact. One of the problems with hyper-eutectic pistons is that this material is very intolerant of dimensional errors because it is a lot more brittle than ordinary cast or forged pistons, unless the pistons are forged from hyper-eutectics as well and many new ones are.

Bogie
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Old 12-19-2009, 05:08 PM
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If you want to lighten the piston. The only safe way with Hyper pistons is to use light weight pins. Usually not enuff material in the piston itself.
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