I'll find out the exact differences for you...I have an old skool BMW brochure lying around somewhere
SO I looked up the figures...only difference I can see is the stroke is different on the same bore size. 323 is 75/84 and 328 is 84/84. Also slight variation on torque figures.
The smaller stroke reduces bhp and torque unless other components are different. It would alter the compression ratio as the cylinder capasity would be less in the swept area, this would be corrected by using a thinner head gasket or decking the block/head/both.. It would alter the total capasity of the engine and the efficiency to not only burn fuel but to change dirty gasses for clean ones, and the ability to fill the chambers on the induction stroke.
I thought both where a 2.5 tho, if the stroke of the 323 is 9mm shorter you cant replace that unless you tune the tits of it. Or force induce it
At the end of the day tho, there is no replacement for displacement
The e46 323 is a M52tu engine. 256S4 Engine code.
The e46 325i is a M54 engine. 256S5 Engine code.
Cylinder head and Headgaskets are the same.
Cranks are the same.
Blocks are different.
Con rods have different part number so also different.
Pistons are different.
Exhausts are different.
Check for yourselves the rest
ah yes cheers ronnie,
theres loads of stuff different between them
Exhaust manifolds even, 325 with cats built in,
I think the 323 have them very close to manifold but bolt on seperately
conrods & pistons as said will be a massive difference between the two
If you really want it to be loads faster you will always be better just getting an m3 or 330ci instead, will be a lot cheaper that lots of mods or buying turbo/supercharger kit
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