26-07-2018, 07:12 AM
I find the limiting factor for me when trying to blueprint something is the accuracy of whatever I am using to measure things. I usually end up measuring things multiple times and finding I get to a point where every measurement is slightly different but eventually they are come down into a range that doesn't vary if that makes sense. I figure at that point I am as good as I can get things with the tools I have.
I cheated when balancing my rods/pistons. I was getting the flywheel, clutch and crank dynamically balanced so I let them do everything else as well. Everything came back with a note saying don't mix up the pistons, rings and gudgeon pins as they were all balanced as units.
I've been reading an interesting book (from the 50s) all about sports car engines and they talk about inline 4s and how you can never get them perfectly balanced anyway. Secondary harmonics and other such things apparently. But it still makes sense to get everything as good as you can as Ian says I think. I was very careful when I did my MGB engine to get everything as close to specs as I could and that really runs nice and smoothly so was worth the effort.
Simon
I cheated when balancing my rods/pistons. I was getting the flywheel, clutch and crank dynamically balanced so I let them do everything else as well. Everything came back with a note saying don't mix up the pistons, rings and gudgeon pins as they were all balanced as units.
I've been reading an interesting book (from the 50s) all about sports car engines and they talk about inline 4s and how you can never get them perfectly balanced anyway. Secondary harmonics and other such things apparently. But it still makes sense to get everything as good as you can as Ian says I think. I was very careful when I did my MGB engine to get everything as close to specs as I could and that really runs nice and smoothly so was worth the effort.
Simon