fully floating little ends sprocket are when there is no clamping, the little end of the conrod (the part that attaches to the piston) has a special bush in it, and the pistons do not clamp the gudgeon pin in any way either, just 2 nylon caps on each side of the piston stop the pin from rubbing on the walls. This reduces frictional force at the little end giving me a tiny tiny tiny bit more power (almost unrecognisable) and less wear.
A piston is a piston, ofcourse there are different types but unless u r running a turbo or very high temps there is no need for forged. So in the context that were talking about they are. And if you want to get onto the tiny aspects of piston dynamics, powermax pistons bugger cylinder walls, ive been told this by 3 engineering firms who sucked their teeth when i mentioned 'powermax', they said get omega.
And no, 1430s do not have 74mm pistons, they have 73.5mm pistons with a stroked 84.3mm crank (mines an 84mm br turbo crank though) making it 1425.6cc
Well, i have omega pistons, cosworth fully floating little ends (which exist genius), cooper s balanced and polished conrods, and a turbo xdrilled wedged tuftrided nitrocarbonised crank.
both bush and pin r cossie.
in response to the question, forged cosworth 73.5mm pistons are flat top forged pistons which can be machined to give a dish. They will be very good pistons but if they are flat top make sure you measure your compression ratio and try and keep it under 11:1 to achieve a drivable engine, ideally 10.5:1, or you will detonate holes all in your combustion chamber and pistons. Often cosworth are advertised along side omega forged pistons, very similar, flat top. Stick em in!
if you want to ask someone about identifying them, talk to KAD, they offer them with their 1380 16V engines.
dont a bit more reseach, cosworth part numbers are usually stamped inside the piston, not on the sidewalls but on the otherside of the top
here:
the part number can be opposite the 'in cosworth' sometimes, dependant on piston. But if they say 'cosworth' and there 73.5 theres nout else they can be.
Edited by alexcrosse, 24 January 2008 - 07:28 PM.
