Quote:
Originally Posted by Ortolan
While researching the project I read that increasing the bore of the M103 left the cylinder walls too weak. Apparently the Brabus 3.6L had a very short lifespan. This is why I elected to leave the bore alone and only increase stroke. The increased stroke also reduces the chance of detonation at the same compression ratio.
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From whom did you hear of the 3.6's apparently short lifes[an & what do you deem to be short? I have a Brabus 3.6 which has done over 130,000 miles, still going string (touch wood). I've done all the top end work (valve stems & guides, head gasket) due to a head gasket failure at around 100k but this is a common M103 fault. The car does consume some oil, in the region of a quart every 700 miles but tuned engines are such and I'm using Mobil 1 15W-50 Fully Synthetic, I may switch to a semi-syn as I've heard this will cut back consumption and may be better for an older engine.
The torque increase from boring the engine should not be overlooked. This really increases low down torque significantly well still having an apetite for the heady heights of 6550RPM. Do it!