Hard; 20% gain with blue printing can only be done by the factory (I think)
Originally posted by ChrisB How hard is it to gain that 10-20%? I guess it takes a lot of experience to do it?
Each part of the engine is made with a certain tolerance.
Asume the "normal" weight of a piston is 300 grams. If you check 1000 pistons, the weight will be between 280 and 320 grams.
So the aim is to source (four) pistons wich are the lightest and have the point of gravity in the same place.
Same goes for con rods and the crank and so on.
DIY blueprinting is having the crank balanced as good as it can be done, machineing the pistons and conrods to the same weight and so on.
Yeah, noone said it's for the faint-hearted!
say you have a 'loose' piston-cylinder combo and a 'tight' one.
swapping those pistons, would result into more ideal sealing in both.
Same with the tappets.
And on...and on...
....then you get fed up and sell the car at a loss...lmao