Piston weights?

Anybody know the average weight of the different pistons?

T1?
T2 Mahle?
Aftermarket forged?

they all vary, a forged piston is a lot heavier than cast, with forged you always want a strong rod, this prevents the rod from coming apart when you let off the gas, esspecially if you have a manual trans.

[glhsken]

FYI...

I was told the Mahle 2.2's were roughly 438 grams. My new forged slugs weighed in @ 442.8 to 443.2 grams.

(the machine work was mic'ed to be accurate down to the Hundred thousandth after receipt)

good topic, I have a digital scale I use for my sbc's , I'll try to throw a set of pistons on this weekend and see what we can come up with. I've only used it for my sbc pistons, I did'nt bother trying to balence any of the 2.5's that I built as most guys tell you not to bother.

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they all vary

true

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a forged piston is a lot heavier than cast

Very general statement, but "usually" true. A GOOD forged piston isn't heavy.

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prevents the rod from coming apart when you let off the gas

Since the piston stops at the top and bottom of the stroke EVERY singel revolution, irregardless of wether accelerating or decelerating, how does letting off the gas affect the rod? RPM and thus piston speed affect the rod, but letting off the gas? I have to disagree.

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My new forged slugs weighed in @ 442.8 to 443.2 grams.

What brand were these?

Thanks for the info guys!!

[glhsken]

Wiseco... they are top Notch

[4sfed4]

As a reference, the new stock TIII forged Mahles I have weighed in the 450 g neighborhood (with rings).

[MachineHead]

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Since the piston stops at the top and bottom of the stroke EVERY singel revolution, irregardless of wether accelerating or decelerating, how does letting off the gas affect the rod? RPM and thus piston speed affect the rod, but letting off the gas? I have to disagree.

Remember the air/ fuel mix is ignited BEFORE the piston gets to the top of the bore. When giving it full throttle there is a force pushing down on the piston before it ever turns around and starts to travel down. When you let off the gas at high rpm's the force pushing down on the piston is MUCH less, alowing the full weight of the piston to try to go up without much resistance. Once the rod starts to come down under those conditions, there is a tremendous load going opposite directions- without the combustion smoothing it out.

I stand correct MH. I never thought of it that way. Thanks for the correction.

[turbodudehere]

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Originally posted by pauvil they all vary, a forged piston is a lot heavier than cast, with forged you always want a strong rod, this prevents the rod from coming apart when you let off the gas, esspecially if you have a manual trans.

My 2.2 JE's are 418 grams and the stock cast were 457 grams.