Those are good points. But for me, factory Mazda racing teams run the MZR DISI Turbo with balance shafts intact (they're totally stock engines). And those racers aren't taking it easy on those motors. Just food for thought. If any conditions were ripe for oil starvation on main bearings, it'd be the high-G driving these factory race team cars experience, right?
Very reasonable thinking, key there is stock engines, which we know work great stock. But start swapping turbos and pounding well maybe it needs an upgrade. However I personally probably wouldn't bother doing BSD on a stock engine, but if I was building an engine I'd take it out.
But higher-than stock power levels has zero to do with oil sloshing under G's, correct? I may be missing something obvious, but this doesn't add up to me. Is it that the forces the main bearings see are greater and the oil film layer can be compromised due to the extra power, perhaps?
Perhaps, I'm not in anyway saying it's a nesicaty. I'm simply saying that while you're there pulling it all apart to build an engine why not add it in? Is it needed I haven't read enough to comment either way, but I do know it won't hurt, will reduce sloshing and will reduce weight.
Indeed. My primary concern is vibes, being fully mounted. The concept for the car will be occasional DD/weekend warrior. So I'd still like to have some civility. I think we've all heard the stories about vibes on fully-mounted cars with BSD.
Right, I know the BS's aren't an issue of engine safety; they're purely for NVH. That's why they're not on trucks (whose owners and driver expectations of the vehicle aren't typically the same). Having said that, cancelling out the secondary forces is nice if you have a lot more NVH anyways due to full mounts, aftermarket exhaust, etc.
