OM606 Thread/Info/Discussion
- Thread starter fjdiesel
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I might be talking or my butt, but wouldn't that be an rpm issue?
I believe the main reason people go for the heavier springs is so they can rev higher, which the 606 likes and continues to make power unlike a lot of diesels. I'm not sure if boost causes issues with forcing valves open on these. May lose a little power with heavy springs, but could gain back more if there is valve leakage with higher boost levels.
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- Thread starter
- #124
I think you are correct. It's an rpm issue. But Like @DirtSniffer said, I thought I had heard with higher boost they can float with the stock springs. Not 100% on that though...
The glorious sound at 7k rpm is reason enough. Lol
backpressure is a bigger issue then boost. 40 psi on a 16cm he400 is fine but 25 psi on a he221 6cm will float the valves. Thats why Mercedes decided only make the exhaust valve springs stiffer on the om648. of course RPM is also a factor, if you have a back-pressure gauge it would probably help tuning in that compound setup and you might be able to make quite high boost without floating.
- Thread starter
- #128
I was just reading about backpressure. I will get that measured.