Here's why:
* Different Combustion Chambers: The 1KZ-TE head is designed for a turbocharged engine with a higher compression ratio. The 1KZ-T head is designed for a naturally aspirated engine with a lower compression ratio. The combustion chambers are different sizes and shapes.
* Valve Sizes: The 1KZ-TE head has larger valves to handle the increased airflow from the turbocharger. The 1KZ-T head has smaller valves.
* Intake and Exhaust Manifolds: The 1KZ-TE head has an intake manifold designed for a turbocharger. The 1KZ-T head has an intake manifold designed for natural aspiration.
* Valve Timing: The 1KZ-TE head has different valve timing compared to the 1KZ-T head, which is crucial for the turbocharged engine's performance.
Potential Problems:
* Compression Issues: You'll have incorrect compression ratios, leading to poor performance and possible engine damage.
* Valve Interference: The larger valves in the 1KZ-TE head might interfere with the pistons in the 1KZ-T block, causing catastrophic damage.
* Mismatched Intake and Exhaust: The different manifolds won't properly align with the cylinder head, leading to air leaks and poor performance.
* Fueling and Timing Issues: The 1KZ-TE head's ECU and timing are designed for the turbocharged engine and won't work properly with the 1KZ-T engine.
Alternatives:
If you want to improve the performance of your 1KZ-T, consider these alternatives:
* 1KZ-TE Head Modification: You can modify the 1KZ-TE head to work with the 1KZ-T block, but this is a complex and expensive process requiring specialized knowledge and machining.
* Turbocharging the 1KZ-T: This is the most common and effective way to increase performance, but it requires a complete turbocharger kit and modifications to the engine management system.
In short, directly swapping the 1KZ-TE cylinder head onto a 1KZ-T engine is not feasible and will likely lead to problems. It's best to explore other options if you want to increase the performance of your 1KZ-T engine.
