Orange Pistons

[Rawze]

(02-06-2019 )Signature620 Wrote:  All genuine parts Rawze.

Do those spray patterns stay there long term? Before it came apart I drove it for 3hrs with a leaking thermostat and it didn't get hot enough to move out of the cold start/warm up mode.

Well, the second picture (not the orange one) looks like there was some smoke buildup (grey-ish color), and some slight hints of NOx gas buildup on the edges of the bowl in a few places. It is a sign of it running as lean as someone could get away with. - I would say to back off the boost pressure a psi or so + injection timing about 1-2 degrees in the working regions if someone have boroscoped it and it looked like that just for protection. A Uni pointed out, the spray is right at the top edges of the bowl too. You can usually get away with that, but it olny takes a bad spray nozzle on one injector to push it over the limit and cause a piston issue when running it at the top edges like that. - I run mine there, but i use reduced HP (450hp/1750trq) and never drive hard. That is how I get away with it on mine. A hard working engine, it could be a bit risky, just saying. On a hard working engine, big hp, you would want it not quite as clean running, to the point of seeing occasional smoke puff when getting on it hard while the turbo caught up.


That is my 2-cents on it base on a very limited view of only a picture or so. If i were standing over the engine and looking at the whole thing, liners, under side of head, etc. it would likely be more revealing.