I did a quick CR calculation using stock bottom end and M52TUB25 piston: 12.5:1 CR. this is without valve pocket volume as I don't have any volume measurement.And you can use quite wild cam with high valve lift without machining pistons.
so this is the max theoritical CR with that combo, considering that each additional cc to the dead volume has a big impact on the final CR...
so yes, it may also be a good combo as it doesn't need any machining but a 2mm HG to achieve a 0.8mm squish.
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Messages - Freak
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How about plan C?
M52B25Tu (euro) flat top pistons. Piston height is little bit bigger, 32,7mm vs. M50b25 32,55mm vs. M52B28 ~31,8mm. These pistons already have more then 3mm deep valve pockets intake and exhaust side. With thicker 2mm (stock)HG you get 0,8mm squish. I can't calculate exact CR but deep valve pockets will lower it. You can also shave the pistons 0,2mm to get 1,0mm squish.
M52B25Tu (euro) flat top pistons. Piston height is little bit bigger, 32,7mm vs. M50b25 32,55mm vs. M52B28 ~31,8mm. These pistons already have more then 3mm deep valve pockets intake and exhaust side. With thicker 2mm (stock)HG you get 0,8mm squish. I can't calculate exact CR but deep valve pockets will lower it. You can also shave the pistons 0,2mm to get 1,0mm squish.
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