Hi.
I have issues with breaking in new rockers on new camshafts in my 911 SC engine.
The engine is a modified 3.0 engine with 3.2 RSR Mahle Motorsport cylinder and piston kit, RSR spec camshafts and 46MM PMO ITB`s.
The rockers are new original Porsche but grinded at a very reputable workshop that has been in the Porsche industry for many years. The reason for grinding the rockers was that they had bad grinding directly from the factory.
The camshafts was also new and also from a very reputable vendor to the Porsche community.
Oilpressure is great and cam tower spray bars are working as they shall.
Assembly of the rockers and rocker shafts was done dry then rockers lubed by hand in the oil feeding hole. Both camshaft lobes and rocker pads was pre-lubed with a very thin layer of DRIVEN brake-in grease.
Engine was cranked by hand until new oil came to the spray bars.
Engine then cranked by starter without fuelpump working, twice, until pressure gauge showed 1.2 bar before connecting fuel pump for first start up.
So to the case.
After the first 20 minuttes at 2000 rpm run in, using brake in oil from DRIVEN with 2400ppm ZDDP, there are "golden" residue on many of the rockers.
My thoughts are that this is wear from the rocker bushings being flushed out and flowed with the oil to the rockers and then "forged" between the surfaces during engine operation.
Can it be that the factory is using different bushings metallurgy on the latest rocker versions than on the older ones?
I also find the pattern on the rocker pads strange. It looks like they are not grinded good enough.
SO what do the fellow Pelicans think about these things?
With golden residue:
With golden residue and bad mating surface:
Rocker with bad mating suface:
