Quote:
Originally Posted by tjts1
You're not going to gain MPG by adding a turbo. Sorry. Several people have experimented with wiring the wastegate open for long highway drive to reduce back pressure and improve FE at low load. Its worth about 10-15% improvement depending on how your exhaust is setup. Check the MB forums for more info.
If you're going to go to the trouble of swapping engines you might as well find the newer OM601/02/03 cross flow engines found in the W201 and W124. These engines are substantially more efficient than the OM616 and OM617. Even a non turbo OM601 will be a big improvement from your current 55hp.
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So turbo no good, but big exhaust would help? How big for optimal mpg? what about a home made header? optimal runner diameter? Optimal runner length?
Any idea if any of those more modern engines you mentioned would bolt right up to a 64 or 65 4 speed manual on the column? I've got a parts car with a blown gas motor, maybe I will max out the nice one with the stock engine, and throw whichever modern motor you think is optimum for the parts car.