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:
84.00 bore
75 stroke
2495cc total displacement
189whp
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..
Interesting, huh?
Comments? Ideas?
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:
84.00 bore
75 stroke
2495cc total displacement
189whp
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..
Interesting, huh?
Comments? Ideas?