00:00Ja!
00:30Ja!
00:42510 horsepower, 650 Nm.
00:45This is the most powerful pure 6-cylinder engine we have ever installed in a production car.
00:50590 horsepower, 700 Nm.
00:53This is the most powerful pure 6-cylinder engine that BMW has installed in a racing car since the days of a BMW M1 Group 5.
01:02So let's take a look at what differences, but above all, what similarities these two engines have.
01:08Yes, this engine from the current M4, starting with the crankcase, the cylinder head, the crankshaft, the connecting rod,
01:17is all designed to deliver maximum performance on the racetrack.
01:21As a racing engine builder, I am of course happy to hear that, because after all, we are talking about the BMW M4 GT3,
01:28the successor to the M6, with which we just won the 24 hours of library.
01:32This is the spearhead for our customer operation, for our customer vehicles, which we sell worldwide.
01:43In the M4, the engine is tilted by 20 degrees.
01:46Unlike before, the engine was also raised slightly to create space for the turbochargers at the top.
01:53However, the engine has a deep oil pan at the bottom, which protrudes relatively far down.
02:01On the intake side, we have integrated a large intercooler directly, which goes to a large throttle valve.
02:09Finally, we have the turbochargers suspended on the side of the engine, which pass their exhaust gases on via two large catalytic converters.
02:24This naturally means that this engine is relatively low on the one hand and relatively wide on the other for a racing engine.
02:39We had to change that now.
02:42Before we started at BMW Motorsport, we naturally thought about what the requirements were for the racing engine.
02:48Performance, reliability.
02:50Of course, the sedan already brings that with it, but in the racing car it is also important to have the center of gravity as low and as central as possible.
02:58That's why we started by lowering the engine down low.
03:05To do that, we changed one fundamental thing.
03:11We first raised it not completely, but to 7 degrees.
03:19The engine remained identical.
03:27The crankcase around it and the cylinder head.
03:34But underneath there was now only a flat dry sump with an oil pump that immediately disposed of the oil.
03:46We were able to leave the turbochargers in the same position, but they were released into the open via a large volume racing system via a racing cut.
04:03And on the intake side we built a special air collector with two throttle valves, so that there was space underneath for the oil tank.
04:15This meant that we were now almost 20 centimeters lower in the car and could also see the entire width of the engine deep down.
04:22But you've now gone one step further, especially with the oil supply.
04:27We can take a closer look at that here.
04:30The requirement was to lower the engine as low as possible.
04:34We couldn't live with this extremely high oil pan and marine engine.
04:38That's why we made a completely new dry sump, which was cast in the foundry in Landshut.
04:44It is now 30 millimeters high below the engine.
04:49Using these extraction pumps, we extract all the oil from the engine and bring it to the oil tank, from where it is returned to the engine via the pressure pump.
04:59The separation system we have at the top is important here, as it separates the air and the oil from each other and ensures that we always have oil at the extraction point.
05:09This separator is a special development that we have made here.
05:12It was manufactured using the adaptive machining process.
05:15We have been using this in racing for 20 years, but it has now also found its way into series production.
05:20Cooling is very important for the series M4.
05:29I have the integrated intercooler here.
05:32The hot compressed air from the turbocharger comes from here via the throttle valve and is cooled in the indirect intercooler.
05:41This is connected to a separate cooling circuit of the vehicle.
05:45The cooled air then flows into the engine via the manifold via six outlets.
05:49With the racing engine, we were able to use a direct intercooler because the engine is hidden deep and far back in the chassis, which allowed us to minimize pressure losses even further.
06:00This allowed us to generate more power.
06:03At the same time, we divided it between two throttle valves, which improved the engine's responsiveness and were able to separate cylinders one to three and four to six, which also allowed us to significantly increase the power output.
06:16In addition to the differences we've just seen, there are of course many components that are identical between these two engines.
06:27For example, I've brought the connecting rod and the piston here, and these are the exact components that determine the power output, both for the sole engine and for the enhanced version in the racing engine.
06:37I'm holding the turbocharger here, which was specially developed for the sole vehicle, the sole M4.
06:44The manifold and turbine housing are cast in a single piece and dimension to be strong enough to provide both the power required for the sole engine and the higher power required for the racing engine without having to make any modifications.
06:56And of course, the list of identical components goes on.
07:01The crankcase, the cylinder head, the entire interior of the cylinder head, the cylinder head cover, all of that is identical.
07:08The exhaust gas now flows from the turbochargers to the exhaust system via two highly efficient cuts close to the engine.
07:15And I think you were able to take a completely different approach with the exhaust system.
07:19That's right!
07:20In principle, we were able to design the exhaust system to be much larger by positioning the engine lower in the vehicle, and we were able to significantly de-throttle the entire exhaust system.
07:30These large pipes end in a 110mm exhaust pipe, which then releases the exhaust gases into the open via a prescribed Motorsport catalytic converter via this tailpipe.
07:41But it's not just the components that are identical, we also work closely together during production.
07:46The entire engine is assembled here just a few meters away from us based on a basic engine from series production.
07:53And that brings us full circle, because BMW Motorsport and BMW MGMBH have a shared history that began here at this location on Prusenstrasse.
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