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+--- Thread: How much do stock pistons weigh? (/showthread.php?tid=4098)
How much do stock pistons weigh? - jikemenkins - 04-23-2025
Hello all,
I'm curious if anyone knows, or has a source for the weight of the stock pistons? I'd take wristpin and conrod weights as well if anyone knows those, or a likely source.
Thank you for your time.
Mike
RE: How much do stock pistons weigh? - peterbaron - 04-23-2025
Have no data for our CB1100, but
For Honda CBR 1000RR, OEM parts:
Wrist Pin - 49 gr
Piston (no ring) - 178 gr
Con-Rod + Bolts - 318 gr
Variation is about +/- 1 gram for stock.
RE: How much do stock pistons weigh? - misterprofessionality - 04-23-2025
The one person on here that may have ever taken them out to weigh them would be PowerDubs.
RE: How much do stock pistons weigh? - jikemenkins - 04-28-2025
(04-23-2025, 11:38 AM)peterbaron_imp Wrote: Have no data for our CB1100, but
For Honda CBR 1000RR, OEM parts:
Wrist Pin - 49 gr
Piston (no ring) - 178 gr
Con-Rod + Bolts - 318 gr
Variation is about +/- 1 gram for stock.
I presume for a bike like the CBR1000RR, Honda would have made a max-effort attempt to reduce mass here. Probably not a good apples-to apples, or even apples-to-oranges comparison. Thank you for the data point though! In my searching I've found a lot of 1983 cb1100F aftermarket forged piston weight data.
(04-23-2025, 10:42 PM)misterprofessionality_imp Wrote: The one person on here that may have ever taken them out to weigh them would be PowerDubs.
Without question! If I ever get the data I'll come back here to share.
(04-24-2025, 04:03 AM)m in sc_imp Wrote: I have to ask: why?
I'd like to calculate piston acceleration forces.
RE: How much do stock pistons weigh? - Whoops - 04-28-2025
(04-28-2025, 08:07 PM)jikemenkins_imp Wrote:(04-23-2025, 11:38 AM)peterbaron_imp Wrote: Have no data for our CB1100, but
For Honda CBR 1000RR, OEM parts:
Wrist Pin - 49 gr
Piston (no ring) - 178 gr
Con-Rod + Bolts - 318 gr
Variation is about +/- 1 gram for stock.
I presume for a bike like the CBR1000RR, Honda would have made a max-effort attempt to reduce mass here. Probably not a good apples-to apples, or even apples-to-oranges comparison. Thank you for the data point though! In my searching I've found a lot of 1983 cb1100F aftermarket forged piston weight data.
(04-23-2025, 10:42 PM)misterprofessionality_imp Wrote: The one person on here that may have ever taken them out to weigh them would be PowerDubs.
Without question! If I ever get the data I'll come back here to share.
(04-24-2025, 04:03 AM)m in sc_imp Wrote: I have to ask: why?
I'd like to calculate piston acceleration forces.
I’m not trying to be redundant, but again out of curiosity, why?