Pauljay

Hi Guys,

It's probably been posted before but I couldn't find it in my search.

I'm getting my car custom mapped and will be upping the red-line to take advantage of the Schrick Cams that I have.

My cars power keeps building past the red-line and I wondered what a safe new limit would be?

I have a 2001 W208 CLK55 engine which reaches its limit at 6000rpm. W209 CLKs go on to 6700rpm, a lot of posts say to put the limit to 6400/6500rpm.

Can anyone tell me why as both cars have the same engine except there is a difference in valves?

PC Valkyrie

Below is a portion of one of the press releases when the W209 CLK55 was released. It describes some of the features of the "improved" V8 in the W209 CLK55 AMG. Perhaps some more knowledgeable members can chime in to tell us exactly what the differences are between the engines of the W208 CLK55 and W209 CLK55. It certainly suggests that the pistons, camshafts, and intake manifold are different.

At the heart of the new high-performance CLK 55 AMG Coupe is a further improved V8 powerplant with 5439-cc displacement, developing 15 kW/20 hp more than its successful predecessor model. The eight-cylinder engine provides 510 Newtonmetres of pulling power from just 4000 rpm, impressive figures for a naturally aspirated engine. This enables the two-door model to accelerate from 0 to 100 km/h in just 5.2 seconds, making it exactly 0.2 seconds faster than the previous CLK 55 AMG. The top speed is electronically limited to 250 km/h -- although the speedometer dial in the flagship sports model goes up to 320 km/h, giving an indication of the potential power harnessed beneath the bonnet. Prominent features of the V8 engine from Mercedes-AMG include the use of forged-aluminium pistons and specially developed oil jets for cooling the pistons. Optimum cylinder charging is assured thanks to a twin-pipe intake train, specially formed camshafts and a sports-tuned variable intake manifold, which provide the eight-cylinder engine with all it needs to deliver exemplary torque characteristics. The exhaust system consists of two firewall and four underfloor catalytic converters as well as specially designed silencer systems which minimise exhaust gas backpressure.

Pauljay

Hi thanks for the reply.

I do believe that the differences amount to minor changes. The W208 has a variable intake manifold and I believe the same bottom end.