Carwow/YouTubeWe've been accustomed to the Audi-VW parts bin exercise for quite a while now. Before we dive into the specifics of this Audi-Lamborghini debate, it's worth mentioning that this particular question can be split into two parts: A) Whether the Lamborghini Urus shares the same engine as the C8 Audi RS6, RS Q8, or the second-generation RS7, and B) Did the C6 RS6 use the same 5.0 V10 from the Lamborghini Gallardo?The answer to the first part is a resounding yes. The Urus and its many Audi-badged cousins share VW's MLBevo modular architecture, and the 4.0-liter twin-turbo V8s powering them are pretty much identical — same displacement, bore, stroke, firing order, and so on. Even the power and torque figures are in the same ballpark. Sure, the Urus Performante makes 657 horsepower (the non-PHEV version), but there are Performance variants of the RS6, RS7, and RS Q8 that produce over 620 horsepower and similar torque figures as the Lambo — 627 pound-feet.Answering the second part, however, may not be as straightforward. Obviously, the C6 RS6 used a twin-turbo 5.0 V10, while the Lamborghini Gallardo, especially those from the early 2000s, featured a naturally aspirated engine with the same cylinder count and nearly the same displacement (4,961cc versus the Audi's 4,991cc). But those are the only similarities between both engines. During a chat with YouTube's JayEmm on Cars, REPerformance highlighted the many differences, from compression ratios to bore and stroke measurements — 82.5 x 92.8 mm in the Lambo versus 84.5 x 89 mm in the RS6. In fact, the 5.0-liter twin-turbo V10 has more in common with the 5.2-liter V10 found in later Gallardos, Huracans, and R8s, according to REPerformance UK.AdvertisementAdvertisementRead more: 11 Huge Engines With Surprisingly Low HorsepowerIt's all a bit complicatedIn another one of JayEmm's videos, he goes over the 5.0/5.2's rather complicated history, specifically why Audi chose to build a V10 from the ground up instead of rehashing Lamborghini's 5.0-liter unit. According to him, bosses at Audi thought the 5.0 wasn't up to the standards of the brand.As it turns out, the twin-turbo 5.0 is a destroked version of the naturally aspirated 5.2-liter V10 found in Audi S6s and S8s of the time, which has an 84.5 mm bore and a 92.8 mm stroke. Interestingly, however, the S6/S8's V10 features a split-pin crank, unlike the common-pin arrangement in the R8/Huracan's 5.2-liter V10s. This opens up the odd versus even-firing debate, a key reason why the S6/S8 V10s sound awfully similar to the Gallardo 5.0, and why the later Gallardos and Huracans sound different. The 5.2 in these cars was developed from the S6/S8's V10 but with a bespoke head design and internals.If all this isn't convincing enough, understand that the 5.0 twin-turbo's output exceeds Lambo's numbers by quite some margin, with the Audi churning out 580 horsepower and 479 pound-feet of torque. Even the most potent of the 5.0s — the 2007 Gallardo Superleggera — could only muster 523 horsepower and 376 lb-ft of torque.AdvertisementAdvertisementIn essence, the naturally aspirated 5.0-liter V10 was exclusive to the early Gallardos — no other car had it, and folks claiming their RS6s have its derivative are nothing more than an urban myth. That, however, is not the case with the Lamborghini Urus and its corporate 4.0-liter twin-turbo V8.Want more like this? Join the Jalopnik newsletter to get the latest auto news sent straight to your inbox, and follow us or add us as a preferred search source on Google.Read the original article on Jalopnik.