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Old 03-12-2009, 07:31 PM
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Sealed Power/Speed Pro hypers Weight matched?

I got a set of sealed power (which I think is the same as speed pro and federal mogul??) hyper's and was wondering what the weight tolerance between the pistons would be. I'm installing them on a set of SCAT rods, which are matched within 1 gram so i would like the set to be balanced as close as possible. i searched but could not find it.
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Old 03-12-2009, 08:45 PM
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I just put together a 454 with a set of weight matched Speed Pro forged pistons. I balanced them to within 0.1 gram but here's how they started. Excel doesn't paste well into here. What I have listed is each pin or piston weighed 5 times, the Std deviation, average and grams over the lightest. The last number is the one your interested in.

Kevin

Pins
1 154.1 154 154 154 154.1 0.054772256 154.04 0.32
2 154 153.9 154 153.9 153.9 0.054772256 153.94 0.22
3 154 153.9 154 153.9 153.9 0.054772256 153.94 0.22
4 153.9 153.8 153.9 153.8 153.8 0.054772256 153.84 0.12
5 154 154 153.9 153.9 154 0.054772256 153.96 0.24
6 153.7 153.8 153.7 153.7 153.7 0.04472136 153.72 0
7 153.9 154 154 153.9 153.9 0.054772256 153.94 0.22
8 153.9 154 153.9 153.9 153.9 0.04472136 153.92 0.2

Pistons
1 742.5 742.7 742.7 742.6 742.6 0.083666003 742.62 0
2 745.1 745.15 745.2 745.3 745.2 0.074161985 745.19 2.57
3 744.6 744.56 744.7 744.6 744.7 0.064187227 744.632 2.012
4 744.5 744.5 744.5 744.4 744.5 0.044721359 744.48 1.86
5 744.1 744.2 744.2 744.2 744.2 0.044721363 744.18 1.56
6 745.7 745.7 745.7 745.7 745.7 1.07896E-05 745.7 3.08
7 745.3 745.2 745.3 745.3 745.3 0.044721355 745.28 2.66
8 744.8 744.7 744.7 744.7 744.7 0.044721363 744.72 2.1
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Old 03-13-2009, 12:41 PM
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Thanks!

The box they came in says 'matched set' on it. Does that mean they are weight matched?
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Old 03-13-2009, 01:51 PM
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Your piston set was "weight-graded and sized". What ever THAT means.

Sneak a couple over to the local grocery store and have the cute young thing working at the deli counter weigh them for ya.
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Old 03-13-2009, 06:09 PM
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http://www.federal-mogul.com/en/Afte...s/Powerforged/

It says they're weight matched to less than 2 grams. Sized to within .0005".

With the pins in the pistons my spread was 2.76g.

Kevin
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Old 03-13-2009, 06:23 PM
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His set are hypereutectic, not forged. I could find nothing that spec'ed hypereutectic pistons in re weight, other than they were "weight-graded and sized".

If they were sold as a set, they will be, in all likelihood, within OEM specs. Or, "close enough for government work". Either way, weigh them. It's just that easy.
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