Challenges:
* Engine Bay Space: The Stealth's engine bay was designed for a SOHC engine. A DOHC engine, particularly a powerful one, might be physically too large or require significant modifications to fit.
* Engine Mounts: You'll need to fabricate new engine mounts or adapt existing ones to accommodate the different engine configuration.
* Wiring Harness: The wiring harness for the DOHC engine will be different from the stock SOHC harness. You'll need to either rewire the entire system or find a compatible harness.
* ECU and Sensors: The DOHC engine will require a different ECU (Engine Control Unit) and various sensors (e.g., camshaft position sensors) that are not present in the stock system.
* Transmission Compatibility: The transmission might not be compatible with the DOHC engine's output shaft or torque characteristics. You may need to find a different transmission or adapt the existing one.
* Cooling System: The DOHC engine might have different cooling requirements. You might need to modify the radiator, cooling fans, or other components to ensure adequate cooling.
* Exhaust System: The exhaust manifolds and piping will need to be replaced or modified to fit the new engine.
Possible Options:
* Mitsubishi 3.0L V6 DOHC: The Stealth originally came with a Mitsubishi 3.0L V6 SOHC engine. You could potentially swap in a later 3.0L DOHC variant (found in other Mitsubishi models), but it would still be a major undertaking.
* Other Engine Options: You could consider engines from other manufacturers, such as Honda, Toyota, or Ford, but finding a compatible engine with the right dimensions and power output can be challenging.
Things to Consider:
* Cost: This project will be expensive. You'll need to factor in the cost of the engine, modifications, parts, labor, and potential unforeseen expenses.
* Expertise: You'll need a high level of mechanical expertise to complete this project successfully. Consider seeking professional assistance from a qualified mechanic or tuner.
* Legality: Check your local regulations to ensure that modifying the engine is legal and will pass emissions testing.
Alternatives:
* Performance Upgrades: You could consider enhancing the existing SOHC engine with upgrades like a performance exhaust, cold air intake, and engine tuning.
* Turbocharger: Adding a turbocharger to the SOHC engine could provide a significant power boost without the complexity of a complete engine swap.
In Conclusion:
Swapping a DOHC engine into a 1991 Dodge Stealth is a challenging but achievable project. It's crucial to thoroughly research and plan before starting. You'll need extensive knowledge and resources to overcome the numerous obstacles involved. If you're not an experienced mechanic or have access to specialized tools and expertise, it might be best to consider other options, such as performance upgrades for the existing engine.
