Quote:
Originally Posted by Helmsman
Quote:
Originally Posted by Scharbag
The list of differences between an S65 (idle at ~600RPM) and a modern (V10, V8, V6) F1 engine (idle at ~4000RPM for the V6 - old V8 idle of near 10,000RPM) would fill a very large sheet of paper.
The S65, while a nice piece of engineering for the street, is not really a race engine. The rotating assembly in the S65 follows the same laws of physics that Mercedes, Ferrari, Audi, Lexus, Honda, Suzuki, Toyota, Yamaha, Ford, Chev etc. all have to follow. Yes it revs high, but no higher than a number of other similar displacement-per-piston NA high revving engines. We do not see the Audi R8 V10 forums inundated with spun bearings and premature bearing wear (the Audi V10 has a higher redline, higher mean piston speed and a larger HP/L output than the S65). Nor do we see complaints in forums for Honda, Ferrari, Porsche etc. Search for Audi R8 v10 spun rod bearing and you find a single post from 2011 that sounds like a bad luck bear bit the guy in the ass while the car had full warranty.
BMW screwed the pooch on the bottom end of this engine. Most of their problems would likely have been avoided if they had simply hand built the engines from "binned" assemblies that guaranteed their design tolerances were actually maintained. Since they did not do this, we get to play the German lottery - where winners are really losers. 
I bet you, that somewhere, there is a German engineer that works(ed) for BMW that has a memo that he/she drafted advising management that the S65 rotating assembly design is compromised - but for fear of getting fired, they just filed it somewhere safe.
Oh, to be a fly on the wall some days... |
Scharbag, we didn't discuss bearing design but reasons to warm the engine up. All engines/oil should be allowed warming prior being loaded, period. And comparing an S65 with 10W60 oil with an Toyota on 5W30 or whatever oil is simply not relevant. And yeah, why would you trust the rpm limiter? Finally, do you rev to the initial 6k rpm from start Scharbag?
Cheers |
This got off topic.
Sorry bout that everyone. We should discuss cold engine care elsewhere.