The 4.8-liter V8 Porsche M48.51 turbo engine was produced by the German concern from 2007 to 2010 and installed on a restyled version of the first generation Cayenne crossover in the back of 957.
The engine has two degrees of boost: for the Turbo modification at 500 hp. and for the Turbo S at 550 hp.
Specifications Of The Porsche M48.51 4.8 V8 Turbo Engine
| Exact Volume | 4806 cm³ |
| Supply system | direct injection |
| ICE power | 500 – 550 HP |
| Torque | 700 – 750 Nm |
| Cylinder block | Aluminum V8 |
| Block head | Aluminum 32v |
| Cylinder diameter | 96 mm |
| Piston stroke | 83 mm |
| Compression ratio | 10.5 |
| ICE features | No |
| Hydraulic lifters | Yes |
| Timing drive | Chain |
| Phase regulator | On the intake shafts |
| Turbocharging | MHI TD04HL |
| What oil to pour | 8.5 liters of 5W-40 |
| Fuel type | AI-98 |
| Environmental class | EURO 4 |
| Sample resource | 200,000 km |
Fuel Consumption 4.8 V8 Porsche M48.51 Engine
Using the example of a 2009 Porsche Cayenne Turbo S with automatic transmission:
| City | 22.5 liters |
| Highway | 10.5 liters |
| Mixed | 14.9 liters |
Reliability and main advantages Of The M48.51 4.8 V8 engine
The German M48.51 4.8 V8 engine is classified by some experts as a sports engine, and it is really very powerful and very voluminous (working volume – 4806 cm3).
From 2007 to 2010, it was installed on restyled versions of the 1st generation Porsche Cayenne.
The M48.51 is a V8 engine that runs on gasoline. Each of the cylinders is served by 4 valves. Accordingly, the total number of valves here is 32.
Also, the distinctive features of this engine include the presence of an advanced direct injection system and twin turbocharging.
Interestingly, there are two modifications of this engine: the first produces 500 hp. (while the diameter of each cylinder is 93 mm here), and the second – 550 hp. (here the diameter of the cylinders is 96 mm).
And the M48.51 engine is famous for its demanding quality of oil and fuel. It is recommended to fill in gasoline not lower than the 98th. In general, this engine can be quite expensive to maintain, but this is quite justified.
Read Also: The Most Common 4.5 V8 Porsche M48.50 Engine Problems
Disadvantages and problems of the M48.51 4.8 V8 engine
The M48.51 4.8 V8, unfortunately, is characterized by badass. This is a common problem with all 8-cylinder petrol engines in the M48 series.
However, this particular engine has additional oil nozzles, and therefore the scuffs do not appear here as early as on some other internal combustion engines.
Another possible problem is the leakage of cooling pipes in the collapse of the cylinder block. These tubes here are made of plastic, and therefore unreliable.
In order to solve the problem once and for all, it is recommended to replace them with aluminum ones.
Also, this engine (subject to aggressive operation) can stretch the timing chain even up to 40,000 kilometers.
And the turbines here, alas, are also not eternal – over time they begin to wear out and lose their former performance.
M48.51 4.8 V8 engine applicability
- Porsche : Cayenne (2007-2010)
M48.51 4.8 V8 engine Tuning prospects
With the standard Stage chip tuning, you can give the M48.51 engine about 50 additional “horses”. That is, a modification that initially has 550 hp. can be pumped up to 600 hp Plus, with such chipping, the torque will increase from 750 Nm to 850 Nm, and the acceleration time to 100 km, on the contrary, will decrease from 4.8 to 4.3 seconds.
If, in addition to the correct firmware, you also install downpipes with sports cars (or without catalysts at all), then you can get an increase of another 20 “horses”.
