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Originally Posted by nukeduster
Ive been doing alot of math lately about calculating engine displacment vs engine output and calculating theoretical engine output based off using OEM replacement parts based off an initial baseline.
I also compared the dyno I have vs the dyno of lots of other e36 vehicles and figured the avg drivetrain loss depending on the dyno and conditions is a factor of .13 to .17 of total output (and thusly, for all calculations I use .15).
Utilizing the basic parameters of my engine:
2495cc total displacement
I figure this: ((pi*((84.00/2)^2)*75)*6)/1000 = 189whp
Thusly, if using a linear line of thinking (and if you examine non-M based motors from bmw, they generally do have a linear output vs displacement) if you used a 328i crank and stock bore and the same base mods to go off of you'd get:
((((pi*((84.00/2)^2)*84)*6)/1000) * (189.5/2495))/.85 = 249.57bhp
Then, if you went a step further and used a 328i crank, non vanos m50 block bored to 86mm (it can be done) you get this:
((((pi*((86.00/2)^2)*84)*6)/1000) * (189.5/2495))/.85 = 261.59bhp
So, I figure with a 328i stroker kit, placed in a bored out m50NV block 260bhp should be very realistic with additional intake/exhaust mods (porting, etc)
Going even a step further of using a s50 crank you would get this:
((((pi*((86.00/2)^2)*86)*6)/1000) * (189.5/2495))/.85 = 267.82bhp
Only 6 more brake horse power..
Originally Posted by triggrhaapi
True, except for one simple thing: The S50 crankshaft is build much differently than the M52 crank. It's more balanced and it spins more easily, resulting in a revvier engine. Bore x Stroke is not everything my friend.
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