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Old 09-18-2006, 03:53 PM
riethoven's Avatar
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Originally Posted by sixto View Post
How about the cam? If the NA and turbo cams are the same then I expect a turbo engine with no turbo will run just like an NA engine.

93 300SD
I don't know about turbo diesel engines but gasser turbo engines typically have lower compression. This accounts for less power before the turbo spools up.

The original Porshce turbo engines had like 7.6 to 1 compression and NA of the same era had at least 9 to 1.

1987 300TD x 3
2005 E320CDI
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Old 09-18-2006, 04:05 PM
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The EPC seems to indicate the same cam for the 603.960 (turbo) and 603.912 (non-turbo). Interesting. The compression ratio is about the same, though, in the 21:1 range. Mercedes doesn't use the low-compression diesel design.

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Old 09-19-2006, 01:53 PM
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if you really didnt want a turbo, you could just disconnect the vacuum from the wastegate actuator, and you wouldnt have any boost. dont know why youd want to though. My car ran like this for years without me knowing.
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Old 09-19-2006, 03:21 PM
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Note that up to about 1989, most (if not all?) the turbo wastegates were pressure operated - so if you disconnected or plugged the hose, the wastegate would never open, and you could end up with excess boost pressure. Most of the 1990-up models operate as Grdenko describes, where they are open all the time (zero boost), unless a vacuum signal is present which closes the wastegate and allows boost to build. Make sure you know which type is on your car before disconnecting or plugging the hoses, as the effects are opposite for the two different types.

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Old 09-22-2006, 09:57 PM
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thanks for all the helpes guys!!!

i'm cleaning all the vac lines and the solenoid thingy today, there's lots of oil leaks around the vacuum lines and ALDA connections

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