2nd December 2012, 15:05
m5board.comoholic (>1000 posts)
Join Date: Jul 2012
Location: Jakarta, Indonesia
1990 E34 M5 Shwarz II
Thanked 62 Times in 56 Posts
Originally Posted by davidoli
I don't believe many owners have completed a build using PPM's kit yet .
This crank doesn't look like one of their's !
Is a 4.1 or 4.2 litre stroker is going too far ?
A standard 3.6 has a piston speed of 20.16 metres per second at 7,200rpm, 86mm stroke
3.8 litre is 21.6 at 7,200 (is the rpm limit on the 38B38 the same or lower than the B36 ?), 90mm stroke
This particular 4.1L is 23 m/s at 7,200rpm, 96mm stroke.
4.2 litre 23.5 metres per second at 7,200 , 98mm stroke ???
If you took a 4.2L to 8,000 that would be 26.1 metres per second (assuming a race engine build with a higher rpm limit), formula 1 engines are doing about 27m/s. A race 4.2L would have a life of only a few thousand km at those piston speeds ?
A good discussion here
Engine & fuel engineering - maximum piston speed?
Tony, long term Aussie expat in Jakarta Indonesia (going troppo)
1990 E34 M5 S38B36 Schwarz II, 57,000kms, Tropical version, full Nappa leather interior, Superchip , staggered TS 235/45 ZR17 , 255/40 ZR17 Toyo T1R (good tyres) mods planned : exhaust system. Restoration items : Reinstall the SLS, interior tidy up, bodywork : repair small dents and re-spray in the original color
1995 E34 530i 5 speed Daytona Violet 154,000kms , 18" wheels , mods planned: EXHAUST : used M5 rear muffler (done), X pipe (pending) and removal of front mufflers (done), slotted + drilled discs, chip, Momo steering wheel, 235/45 ZR18 , 255/40 ZR18 Toyo T1R - my daily driver and a car that I can play with and modify.
Last edited by AseanAero; 2nd December 2012 at 15:19.