Piston and conrod weights

[Flatplane8]

Any of you home AJP rebuilders bothering about the weights of the pistons, conrods etc? The factory manual said to select 'pistons that are within 1 gram of each other'. My heaviest piston is 2.82g more than the lightest. I've tried to weigh the small ends using this lash-up and that gives a combined piston-small end weight spread of 3.7g. Curious, but also mindful that this combo has done 170k miles like this.....

Posted on the FB group too.

[Byker28i]

Dunno, I had a man do mine

Jason at Str8Six

[Robscim]

I'm no expert but when Andy did mine, he said they were all within a gram of each other.

He seemed to think it mattered!

And of course, he had it all balanced afterwards.

It's nice now! Just been out for a quick blast to check

Rob

[Flatplane8]

Robscim said:

I'm no expert but when Andy did mine, he said they were all within a gram of each other.

He seemed to think it mattered!

And of course, he had it all balanced afterwards.

It's nice now! Just been out for a quick blast to check

Rob

I think it helps, I'll see how close I can get mine

[Flatplane8]

Update: After weighing pistons, pins, small end (using the 'thing' in the photo in the first post) I took a bit of weight out of some of the small ends, swapped a couple of pins round and got everything pretty close. I then took a bit off some of the big ends to get the total weight of the conrods within about 0.5g.