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  #1  
Old 23rd July 2017, 07:50 PM
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Default 6.9 Piston Weight

Anyone know or able to measure the weight of a 6.9 piston? Faced with a rebuild, would one be well advised to souce custom hi compression pistons made from lighter high strength modern materials? Would such a mod allow a M100 to rev higher and more quickly?? I remember reading a while ago about max piston speed that MB engineers were faced with during 6.9 development. Obviously they were concerned about durability and the pistons not coming apart but with that comes increased weight. Was the weight the main factor in the rev limit?

I heard 6.9 pistons also have an iron band for a reason unknown to me. Has tech & materials come far enough now that there's a better alternative to standard pistons?

I'm thinking of changing pistons in the future on an Aussie engine, but retaining stock rods.
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01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
79 6.9#5398-P
78 6.9#4248 (Skye)-P
79 6.9#3686 (Moby Dick)
78 6.9#1776 (Dora)
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  #2  
Old 24th July 2017, 06:35 PM
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Default Re: 6.9 Piston Weight

Have it somewhere . Old pistons are sitting in my brothers garage in Perth. But they are attached to the rods. From memory they were close to 900grams where quiet heavy forged pistons rods are beefy as well. Only other person I know with them sitting around out off engine has a few in W.A
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Old 24th July 2017, 06:59 PM
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Default Re: 6.9 Piston Weight

900g is almost 1kg! That's almost 8kg of weight spinning back and forth at 5K RPM! It has also been suggested by a clever person we could ask a part supplier! To be continued....
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01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
79 6.9#5398-P
78 6.9#4248 (Skye)-P
79 6.9#3686 (Moby Dick)
78 6.9#1776 (Dora)
77 450L#067010-P
75 450L#028414 (Gold Nugget)-P
57 Buick 73A (Titanic)
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Old 24th July 2017, 09:04 PM
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Default Re: 6.9 Piston Weight

Give an idea my cast 292 Chevy pistons are 920 grams. Forged Ross 250 pistons are 488 grams . Forged 292 were around 580 something. That's why 250 pistons but need longer rods to use.
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Old 25th July 2017, 07:09 PM
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Default Re: 6.9 Piston Weight

Apparently 6.9 piston & rod complete is 2220g?? Does that sound about right?
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01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
79 6.9#5398-P
78 6.9#4248 (Skye)-P
79 6.9#3686 (Moby Dick)
78 6.9#1776 (Dora)
77 450L#067010-P
75 450L#028414 (Gold Nugget)-P
57 Buick 73A (Titanic)
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Old 26th July 2017, 01:02 PM
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Default Re: 6.9 Piston Weight

Yes picked mine up like that and they are quiet heavy . built like rods from a Hemi .
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Old 26th July 2017, 01:24 PM
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Default Re: 6.9 Piston Weight

That's nearly 18kg of rotating mass not including the crank & torque convertor! Yikes...
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01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
79 6.9#5398-P
78 6.9#4248 (Skye)-P
79 6.9#3686 (Moby Dick)
78 6.9#1776 (Dora)
77 450L#067010-P
75 450L#028414 (Gold Nugget)-P
57 Buick 73A (Titanic)
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Old 26th July 2017, 03:32 PM
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Default Re: 6.9 Piston Weight

Crank well at a guess its over 40kg probably closer to 50. As I said standard cast pistons for a 292 Chevy 6 are over 900 grams thats why I went with 250 forged at 488 grams.
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