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Old 10-21-2013, 05:40 AM
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Stretch Stretch is offline a shield of steel
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Engine builders' advice req'd - removable piston weights?

G'day Folks,

Google couldn't help - well it gave lots of information I didn't want.

I have four new pistons for an engine. I want to them to weigh the same.

At the moment wrist pin rings and piston weights combined come in at

614, 617, 633 and 634 grams

From experience I know that the wrist pins and rings are usually within 0.5 grams of each other - but I will check.

I noticed that on the underside of the pistons there are four steel spring clips fitted to the inner piston wall.

These are Nural pistons for a gasser M102 engine

Are these bits of steel added with the intention to be removed if necessary?

Sorry for the newbie question but if you don't know - you don't know!
Attached Thumbnails
Engine builders' advice req'd - removable piston weights?-m102-removable-weight1.jpg   Engine builders' advice req'd - removable piston weights?-m102-removable-weight2.jpg  
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
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I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior

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