E552006

What is the difference between the two engines other than IC system?
Different internals?
Blower?

vraa

I know it's got reinforced and lighter internals.
That's all I could find through a quick google.

BoBcanada

i say we research and then remake E55 engines into SLR's ones.

MB Fanatic

If you fund the research ill be the first to line up.

Bigdot

well for one,
arnt the S/C AMG 55s 5.4L V8s
and the SLR is 5.5, so there is 10 of the 130 less hp, lol

Mark

tommaey

are you sure that the SLR engine is 5.5L?

So many reliable resources claim the 55s are 5.5L V8s when they're obviously (or not) not

E552006

According to MB they are. Go to mbusa.com and look at the SLR literature.

TECHNICIAN

SLR has a m155 engine. E55 is a m113 engine.

slr is dry sump
supercharger has external oil supply
multi piece crankcase
heads are the same, except valve train

E552006

Same rods and pistons??
Are there any flow advantages given by the valve train?
Otherwise this would indicate that the m113 engine can flow enough air with stock heads to achieve the same power levels.

E552006

Did some research

SLR
ENGINE
Type: supercharged and intercooled V-8, aluminum block and heads
Bore x stroke: 3.82 x 3.62 in, 97.0 x 92.0mm
Displacement: 332 cu in, 5439cc
Compression ratio: 8.8:1
Fuel-delivery system: port injection
Supercharger: twin-screw Lysholm
Maximum boost pressure: 13.1 psi
Valve gear: chain-driven single overhead cams, 3 valves per cylinder, hydraulic lifters
Power (SAE net): 617 bhp @ 6500 rpm
Torque (SAE net): 575 lb-ft @ 3250 rpm
Redline: 7000 rpm

E55
ENGINE
Type: supercharged and intercooled V-8, aluminum block and heads
Bore x stroke: 3.82 x 3.62 in, 97.0 x 92.0mm
Displacement: 332 cu in, 5439cc
Compression ratio: 9.0:1
Fuel-delivery system: port injection
Supercharger: ??
Maximum boost pressure: ??
Valve gear: ??
Power (SAE net): 469 bhp @ 6100 rpm
Torque (SAE net): 516 lb-ft @ 2650 rpm
Redline: ? rpm


Not sure if the Blower is exactly the same, anyone know?

MB Fanatic

Our E55's have a Lysholm twin screw supercharger.

E552006

Same specs? Flow rate?

MB Fanatic

I think the supercharger is the same basic setup but is more powerful in the SLR. The SLR also has a far more efficient cooling system than our E's do.

BoBcanada

Whats SLR weight?

Vadim @ evosport

From performance standpoint - SLR over 55s:

1. Dry sump lubrication (could be worth 20-25HP)

2. 1.5 lbs. of additional boost (15-20 HP)

3. Dual, external intercoolers (30-40 HP)

3. Equal-Length Headers (30-35HP)

4. No exhaust (just mufflers with cats) (10-15HP)

5. More agressive DME tuning for a lighter car (15-20HP)

Here is a picture of an SLR engine:

AMGcrazy

Vadim,

Not a challenge, but a question: How does dry sump lubrication give you added HP?

Everything else makes perfect sense.

Vadim @ evosport

AMGcrazy: No problem. Dry sump removes windage losses due to crank spinning in oil at the bottom of the sump. There are also additional benefits from more efficient lubrication and oil temperature control.

AMG&AMG

even the SLK 55 has the same engine block

E552006

Weight is about 3750 or about 300 lbs lighter than an E55.

E552006

Thanks for the response.
So you are saying there are no differences btw the internals other than lowered compression (head gasket change I would assume).
BTW
Any progress on an air-air intercooler for our E's?

TECHNICIAN

No it doesn't. The M155 in the SLR is split at the main bearings. Its a 2 piece crankcase. The ONLY benz with this type of block. Much like the new v10 in the M5.

Vadim @ evosport

It might have stronger pistons, that's still needs to be confirmed.

As far as intercooling, we are working on SLR style upgrade, first drawings are going to machine shop on Monday.

E552006

Sweet!!!
Can't wait to see the results of this.
Please post updates on the forum.