LoganD wrote: ↑Mon Aug 19, 2019 11:28 am
This engine is better than any engine you've ever worked with modifying. It's amazing to me that people are shitting on engines that can make so much power so easily.
That's very presumptuous of you. Stick to the facts please.
I don't see anyone in this thread shitting on this engine at all. Just questioning some of the design philosophy, which is totally fair. Lets talk about the design rather than talk about people.
I still stand by my words. Let me explain - This is a run of the mill modern passenger car engine. It's not special in its own right. One can argue that modern design and engineering is special compared to how they were done in the past, for sure. Go tear down a brand new engine from any of the large car mfg's and you'll find similar stuff. The only reason anyone has any interest in this engine is because of the Supra. This isn't even an M engine. We didn't see this hype when the B58 came out in 2016. No one was showing tear down videos of 340i engines. That's my point.
This is Speedtalk. We build race engines. Is this a true performance engine? My opinion is that it's not. Everything is done for cost, emissions and economy over performance. That's why I said I would like to see the changes for the S58 version. Turbos make performance so easy these days that the engine can be choked by emissions while still putting out decent power.
Skirted block stronger than a proper bed plate / integrated main girdle? I don't think so, there is a reason why nearly every competition engine uses this system. I can see how conventional caps would be cheaper though.
I'm not convinced the reduction in exhaust manifold volume is that important for a turbo performance engine. I believe cost and emissions is a bigger factor. The S58 version uses individual exhaust ports with a new head casting. Why would BMW do this for the M engine if the integrated manifold like the B58 is better?
No doubt the rear timing chain helps with camshaft harmonics. But its not solving anything as most engines have a front timing drive without issue. Valve lift curves on OEM engines are far from pushing the envelope. So it has been done for reasons other than performance.