> tyler wrote: > Just to play devils advocate (if you didn't notice, I like to > argue...) what harm would the turbo cause that would result in > premature failure? I know it would put extra stress on > anything, but the whole engine and drivetrain of a 240D is > severely overbuilt. > > Most older 240D engines I see finally die from low compression > and severe blowby. With the turbo (even with some conservative > fuel enrichment) the engine will burn cleaner, and have less > abrasive soot to wear the pistons and rings. Perhaps the > increased power would break something else, but it's also > possible that it would not if the turbo system was built and > tuned properly.
It is not in the interest of long term survival of the engine to put a turbo system like the 5 cylinders have. Both the turbo and normally aspirated engines don't make more power because they are at the thermal limits. If more power is generated, so is more heat. And so the pistons especially are likely to melt. Unless the _driver_ has the necessary gauges (exhaust gas temp is the most important) and takes the responsibility to be the safety limit. MB decided most drivers could not be so trusted, and so tuned the car to be "safe". But the factory turbo is limited at aprox 15 psi (lb/in^2) (1 bar). That is _not_ the only choice for a turbo!! If a 240D were fitted with a 3-4 psi turbo (0.2 bar), there would be little increase in piston melting danger - especially with a EGT gauge. Driveability would improve (how much, I don't know), but certainly noticeable at higher altitudes. Or, ceramic coat the pistons, put a big intercooler on, modify the oil flow, and rig a turbo set to 45 psi (3 bar). Then figure on rebuilding the engine ever few months. *grin* -- Philip _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
