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The 2021 Supra actually uses the BMW M340i's engine rather than the Z4 M40i's engine. While the engines are extremely similar to one-another, the Supra/M340i engine's compression ratio is 10.2:1, The Z4 M40i's compression ratio is 11:1. Looking at road test data for both the M340i and Z4...

While not my kind of car, the Lexus RCF (467 HP 5.0 liter normally aspirated V8) is hardly a slouch. That engine also employs Toyota's outstanding D4-S dual (both port and direct) fuel injection system. As such, valve and chamber carbon buildup concerns are eradicated...

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You should read my posted content rather than eating popcorn while wearing "3D" glasses if you're interested in the 2021 Supra's major engine upgrade. Then again, you may not be. It's become clear to me that many 2020 Supra owners are in denial about this and would rather fabricate...

This is what an engine that has the heads in the block looks like. There is no individual cylinder head. Ford hasn't built such an engine since 1953, 67-68 model years ago. In no way does a modern automobile engine (overhead valve in head configuration) cylinder head "include the crankcase."...

The cylinder head is a completely separate item from the block. That's been widely accepted fact for more than half a century. Both the 2020 and 2021 Supra inline 6 engines use aluminum cylinder heads and external steel exhaust manifolds. There is no difference in that regard, thereby...

The 2 exhaust outlets are in the cylinder head (not the block). The 2021 6 exhaust outlets are also in the cylinder head, not the block. Its impossible to use the 2021 6 port exhaust manifold in the 2020's 2 port cylinder head and vice-versa. The last time engine I'm aware of that used...

Oh, I read and comprehend everything. The primary reason the new manifold won't fit is because the 2020 Supra uses a 2 (vs. 6) exterior port cylinder head. I've posted the related illustrations yet again for your convenience. On the left we see the 2020 "2 port" setup, while on the right we...

:) And remember that those 3 pounds include the "aluminum braces that tie the strut towers to the radiator support to increase lateral rigidity," per Toyota's press release. I was admittedly disappointed by the 2020 car in some respects. Having said that, the 2021 version will likely result...

Toyota claims the 2021 Supra is just 3 pounds heavier than the 2020 version (inline six version vs. same): https://pressroom.toyota.com/toyota-gr-supra-races-into-2021-with-more-power-and-first-ever-four-cylinder-turbo-model/ This 2020 BMW M340i is a whopping 455 pounds heavier than the Supra...

Why doesn't the highest output B58 variant (S58, as used in the M3/M4) use "the better more efficient design?" And why would BMW even bother with the 6 external port configuration if they could simply crank up the boost (as so many 2020 Supra owners do through "tunes") to achieve the same and...

Could be, though I'm inclined to think it's marketing related. Either way, expect the USA 2021 Supra's [edit: inline six version's] quarter mile trap speed to be some 5 - 6 MPH faster than the 2020 model. It'll be close up until 70 MPH or so, given lower speed acceleration is compromised by...

One wonders what those regulations are, given that the BMW M340i uses the very same same engine as the 2021 US market Supra, yet is sold in Europe. While the Z4 M40i uses a very slightly different variation (higher compression ratio and presumably less peak boost), it's also sold in Europe...

Sudden bends in an exhaust system [as is the case with 2020 Supra engine] are inefficient because they compromise gas momentum and introduce turbulence. As such, the K (total resistance) factor increases, which means less efficient flow...

It shows (using Hale's formula) that the 2021 Supra's engine is at least 50 HP more powerful than the 2020 engine - at the crank. Do you think BMW specified a less efficient (yet more costly) exhaust system in order to achieve that gain? The 2021's engine's exhaust system is much more...

Can you SEE the difference in the two configurations? The head with the integrated exhaust ports forces the exhaust stream to make sharp bends prior to exiting the head into the 2 port exhaust manifold, thereby restricting flow. The six port head doesn't. As such, the 6 port's flow stream is...

To your point, the 2020 Supras are going to take a hit in resale value. Also, Toyota's stated that the 2021 Supra will be less expensive (feature for feature), though hasn't yet elaborated on the details.

2020 BMW M340i (455 pounds heavier than the Supra in the link below): https://www.caranddriver.com/reviews/a30143002/2020-bmw-m340i-reliability-maintenance/ 2020 Supra: https://www.caranddriver.com/reviews/a27440454/2020-toyota-supra-by-the-numbers/ Both cars were tested by the same magazine...

Ae you kidding me? The "aluminum manifold" is simply part of the Supra's head casting! Any difference in the weight of those two head casting is minuscule! Get a mechanical engineering degree like the one I've held since 1986 and you'll be certain that the 6 port head/manifold flow far more...

There's nothing about the exhaust flow that's "arguably." As a retired mechanical design engineer, I can tell you in no uncertain terms that the 6 port head flows much more efficiently. What's "aluminum vs. steel?" Both engines use steel exhaust manifolds, an aluminum head and aluminum block...