25-07-2018, 03:11 PM
(This post was last modified: 25-07-2018, 03:55 PM by Speedex750.)
Hi Bill,
Adding to Peter's advice - those weights sound like overall totals. You need to get end weights, particularly the little end. It is possible to juggle pistons and gudgeon's around to get things closer but I'd suggest not removing anything from the little end of the rods or piston, match the heaviest little end with the lightest piston assembly. I was taught to balance to the second lightest and try and add a little with a washer etc on the lightest. A cheap set of digital 1Kg kitchen scales does the measuring very accurately. The big ends can be adjusted by removing the two knobs either side of the bearing or removing an unused turn of thread or two on the end of the big end bolts. It is possible to get everything within a few grams. I doubt they were made in matched sets, the production line was probably just fairly consistent in batches(?) so there does seem to be variations between odd rods so beware if you're combining an odd set of rods. Of course assembly becomes very specific after you've done all this matching, something to remember if you do a partial strip and rebuild in the future!
Dave
Adding to Peter's advice - those weights sound like overall totals. You need to get end weights, particularly the little end. It is possible to juggle pistons and gudgeon's around to get things closer but I'd suggest not removing anything from the little end of the rods or piston, match the heaviest little end with the lightest piston assembly. I was taught to balance to the second lightest and try and add a little with a washer etc on the lightest. A cheap set of digital 1Kg kitchen scales does the measuring very accurately. The big ends can be adjusted by removing the two knobs either side of the bearing or removing an unused turn of thread or two on the end of the big end bolts. It is possible to get everything within a few grams. I doubt they were made in matched sets, the production line was probably just fairly consistent in batches(?) so there does seem to be variations between odd rods so beware if you're combining an odd set of rods. Of course assembly becomes very specific after you've done all this matching, something to remember if you do a partial strip and rebuild in the future!
Dave