Scales are here plus I didn't have anything to do on the MG this weekend so I thought I would have a look at balancing the pistons and rods. It may be cold, wet and windy outside but it's lovely and warm in here!
Don't need to balance anything yet so I just used the plate as a flat base to put the scales on and just got myself organised ready to weigh everything.
I have been told to weigh the pistons and balance them separately from the rods. Apparently you can match rods and pistons, ie heaviest rod to lightest piston and do it that way but it makes more sense to me to do it this way. Then the individual components all weigh the same therefore I think the engine will be in better balance if that makes sense.
You will notice that one of the pistons is about 7.5g lighter than the heaviest and that's way outside my tolerances especially as the others are so close together. I took a bit of the skirts on the others to see what difference it made and it's miniscule. I weighed the pins and they are within about 0.5g of each other so I think they are fine and the clips are all within 0.1g of each other as well! I'm just a bit concerned about the weight difference so I have sent JP Pistons a quick email asking them if it's within their tolerances and if it is ok where can I remove weight from the others to match them.
I have had a good practice with the rods and can take them on and off with a 0.1 gram variation. One is quite far out but it's more big end than small. I'm not so worried about them after reading Jeroen's thread and seeing how much he took off his so whilst I'm waiting for a reply from JP Pistons to reply I'll crack on with them.