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400E / E420 power and compression ratings
- Thread starter DLL
- Start date
The compression ratio difference is accurate. USA 1993 model year and newer have the higher 11:1 ratio.
The horsepower ratings are a mystery, there is conflicting data between factory sources (TDM, FSM, etc) between 124 and 140 chassis. I think it's possible the 1992 could have been as high as 282hp but can't confirm this, and also never owned a 1992 400E that was worthy to take to the dyno for testing.
Further confusing things, a 1993-up 4.2L engine makes 275hp in stock form, but with a 92 LH module which has WOT enrichment, this increases a full 15hp (!) to 290hp on the dyno. There were a plethora of other changes as of 1993 as documented here.
The horsepower ratings are a mystery, there is conflicting data between factory sources (TDM, FSM, etc) between 124 and 140 chassis. I think it's possible the 1992 could have been as high as 282hp but can't confirm this, and also never owned a 1992 400E that was worthy to take to the dyno for testing.
Further confusing things, a 1993-up 4.2L engine makes 275hp in stock form, but with a 92 LH module which has WOT enrichment, this increases a full 15hp (!) to 290hp on the dyno. There were a plethora of other changes as of 1993 as documented here.
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