OM606.962 Valve Float @ raised boost?
OM606.962 Valve Float @ raised boost?
Baldur suggested it might be valve float and it makes sense. I've also read that the stock valve springs are only good for about 45 pounds so if the exhaust is at even at 3.5-4 bar absolute and the piston is moving down after the exhaust stroke- it makes sense that forces COULD keep the valve from sealing?
it's tough to be sure on the smoke color because that test was at night on the highway. For sure there was smoke... i thought black but it may have been white? Also for sure it was right at 4500 and I was pushing just under 2 bar of boost about 27psi on my gauge and in the log. The truck just stopped accelerating, started to smoke and made a really strange sound like it was on a rev limiter. I immediately lifted off the gas pedal and the transmission shifted- which put me at a lower RPM and then everything was fine. This has happened a few times and the logs all show good boost, good fuel , vanes wide open and nothing obvious to explain why the engine behaves that way...
Baldur suggested it might be valve float and it makes sense. I've also read that the stock valve springs are only good for about 45 pounds so if the exhaust is at even at 3.5-4 bar absolute and the piston is moving down after the exhaust stroke- it makes sense that forces COULD keep the valve from sealing?
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