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WEC/IMSA - BMW M V8 Hybrid LMDh 2023


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17 ore fa, Albe89 scrive:

Molti articoli parlano che la base è il P66 a cui hanno aggiunto il turbo. 

Tipo questo:

https://sportscar365.com/imsa/iwsc/bmw-reveals-design-name-of-lmdh-car/

 

Ma bene o male indicano tutti come il vecchio motore DTM come base per quello che verrà usato. 

 

Un monoblocco 80x98 con albero motore piatto turbo, non è trasformabile da un monoblocco 93x73 con albero a croce. Resto scettico sulla derivazione diretta.

Inoltre il P66 è stato sviluppato da AC Schnitzer con BMW Motorsport, mentre il P63 solo da BMW Motorsport, ricavando monoblocco e parti delle teste dall'S63.

Edited by Beckervdo

   

299071681_3185610351660041_8900220191808448426_n.jpg

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  • __P changed the title to BMW M V8 Hybrid 2023
  • 2 weeks later...

Per chi si chiedeva perché non hanno utilizzato il motore della M8 GTE ecco spiegato direttamente dalle parole del boss di M Sport Andreas Roos:

https://sportscar365.com/imsa/iwsc/bmw-m8-gte-engine-too-bulky-for-lmdh-use/

 

In pratica era troppo pesante per un prototipo, spiega anche i vari passaggi e le modifiche che hanno apportato al loro "vecchio" V8 utilizzato nel DTM. 

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Arriva la conferma ufficiale: P66/3

 

Mea culpa

Cita

 

Ulrich Schulz, Head of Drivetrain Design at BMW M Motorsport, and his group had initiated an evaluation to determine which race engine would be best suited for conversion into a high-performance hybrid drive system, even before the BMW Group Board of Management had given the green light to the BMW M Motorsport entry in the LMDh category in June 2021. Time constraints and the need to consider sustainability aspects that are playing an ever more critical role in motor racing, as well as the automobile industry in general, meant that returning to the drawing board to design a completely new engine and building it at great cost was not an option. Consequently, the question was to establish which proven race engine would best meet the stringent requirements and specifications of the LMDh regulations.

 

The normally-aspirated P66/1 eight-cylinder engine used in the 2017 and 2018 seasons in the BMW M4 DTM was the one that got the nod. As a fully load-bearing component in the BMW M Hybrid V8, it had the advantage that it could be used in a monocoque chassis without an additional subframe and it was also the one that most closely corresponded to the regulatory requirements after conversion to a hybrid turbo engine.

The first phase saw the normally-aspirated P66/1 DTM engine converted into an intermediate engine, named P66/2, primarily by adapting two turbochargers and adjusting the crank drive. The focus was on durability, increased performance and temperature management for the engine. The P66/2 completed numerous testing units, including complete racetrack simulations, on the test bench. The next step was the creation of the P66/3 race engine, including a twin-turbo version, adjustments to the specific requirements of the Dallara chassis, final exhaust system, oil tank, cabling and integration of the high-voltage environment. The cylinder block and cylinder heads were recast in the BMW Group foundry in Landshut (GER) and the injection system was rebuilt for direct injection. Engineers who already boasted plenty of experience with electric drive systems from the Formula E project were testing and integrating the electric motor in parallel. The unit that forms the hybrid drive system in the car consists of the e-motor, the inverter and the high-voltage battery. There is a separator clutch between the electric and combustion engines, enabling fully-electric driving – in the pit lane, for example.

 

 

 

Specifications for the P66/3 engine in the BMW M Hybrid V8.

 

Name

V-shaped Otto four-stroke twin-turbo engine

Capacity

3,999 cc

No. cylinders

8

Cylinder construction

Cast aluminium cylinder block and cylinder head, cylinder lining as iron layer in LDS procedure

V angle

90 °

Bore

93 mm

Stroke

73.6 mm

Cylinder spacing

102 mm

Valves per cylinder

4

Engine speed

max. 8,200 rpm

Output (regulated)

approx. 640 hp

Torque

approx. 650 Nm

Injection

High-pressure direct injection at 350 bar

Oil system

Dry sump system with six-cell oil drain pump and oil tank

   

299071681_3185610351660041_8900220191808448426_n.jpg

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