Engine Building Part 4 - Balancing Crank, Pistons & Rods 

The second time you weighed the first piston.. the rings where on the frame of the scale that's why you got a different reading

If you're going to weigh piston assemblies 3 time then be sure to rotate it 120 degrees each time to get a correct average, also try and keep the rings, clips and pins over the centre of the piston

Should I grind my piston ring to the right gap, and then balance the pistons? Seems like depending on how much each ring needs to be grinded to gap, it could alter the weight for that piston significantly.

Am really loving these series of videos. Gat my note books alla scribbled up with notes. I have my fingers crossed that these will keep coming until the build is complete. So much learn.

Feel free to ask any questions here!

Very interesting content 👍

You didn't actually show the balancing of the crank, you just spoke of it. Is it balanced with counterweights on it, what rpm do they balance it at.

So in short I can balance my pistons, rods rings / C-clips and grudging pins all together at home using some quality scales but I need to take my crank , flywheel and crank pulley to a shop to be properly balance ? Cheers ?

Shouldn't you also send the pistons, rods and bearings to the machine shop when balancing the crank, if I stand correctly the weight of those components should also be taken into consideration when balancing the crankshaft.

Part 5: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-e3ZTbqmKYyE.html

How repeatable are the readings you're getting from that rod balancing jig? Despite many tutorials, hours of videos watched, following as many carefully detailed instructions as I can I have yet to see anything reliable enough that I feel comfortable calling accurate. The scale is though. Through 8 rods, weighing gross weight each 10 times (to verify the scale) I don't seen more than a .2g variance.

Should you install the bearings in the rods before balancing considering you are doing the same with including everything in the piston?

when weight the small end of the rod, if you don't measure it like how you measure on the big end, what happen if the small end all having same weight but the rod's middle part is heavy than others ? i would think measuring them like how you do with the big end would be most accurate ?

I would wight all the parts separately and then put all the heavy rings with the lightest ones and then make changes from there if needed but your way would be much quicker lol the only reason I would do it my way to see if I would have to make any changes if that makes sense ;)