Here's why:
* Engine Bay Size: The 300E has a larger engine bay designed to accommodate its larger engines. The 190E's engine is physically smaller and likely wouldn't fit without significant modifications.
* Engine Mountings: The engine mounts on the 190E and 300E are different, making it impossible to directly swap the engine.
* Transmission Compatibility: The 190E and 300E used different transmissions, so even if you could physically fit the engine, the transmission wouldn't be compatible.
* Wiring and Electronics: The wiring harnesses and electronic control units (ECUs) are specific to each model. It would be a massive undertaking to rewire the 300E to accommodate the 190E engine.
Possible Workarounds:
* Engine Swap with Modifications: While technically possible, it would be an extremely complex and expensive project. You'd need to find a way to adapt the 190E engine to fit the 300E's engine bay, modify the mounts, create a new wiring harness, and potentially change the transmission.
* Engine Replacement with a Compatible Engine: If you want more power, it's generally much easier to replace the 300E's engine with a larger, compatible engine from another Mercedes-Benz model.
Recommendation:
If you're looking to upgrade the performance of your 300E, it's highly advisable to stick with compatible engine swaps. This will save you a lot of time, money, and frustration in the long run.
