Engine without reroute
- Unequal cooling across the engine block, resulting in different combustion conditions from piston to piston. This induces uneven wear and tear on all parts. Also the overall heat transferred from your engine to the coolant is poor due to "front in - front out" design. Because of this it's wise to keep an eye on your oil temperature when driving hard, like on the track or with forced induction.
- Piston rings and other parts wear is increased in rear cylinders due to stress from higher temperature. Bad piston ring seal leads to increased oil consumption, worse emissions and decrease in power. This is measurable as compression test values decrease from front to back cylinders. Compression loss does not happen quickly on street driven cars, but the engine resealing is quite expensive.
- Carbon deposits build up much quicker on the valves with high cylinder temperatures. This happens when fuel and oil comes to contact with very hot valve surface. The deposits create turbulence causing decrease in performance and problems like stumbling, misfiring or even hard starting. The thicker the carbon deposit buildup on the valves, the worse the problems.
- Spark plugs run hotter due to less heat being taken from the rear, which can escalate if driving hard for longer periods of time. When spark plug temperature exceeds 800°C, pre-ignition can occur. Melted electrodes, blistering on the insulator or yellowish colour are the most usual signs of overheating. Pre-ignition dramatically raises the cylinder pressure and can cause serious engine damage.
Engine with reroute
- Efficient cooling with front-to-back coolant flow as originally designed for B-series engines by Mazda. Proper cooling of the engine means less stress on all parts, especially during high loads. And the cooling fan will need to run less often, meaning less alternator load.
- Even temperature on all four cylinders. Having the same conditions across the engine allows for optimal power and reliability. This way you should get even engine and parts wear and lower risk of something going wrong (assuming everything else is OK).
- Accurate temperature reading for your engine management system (ECU, EMS) means it can deliver more accurate air/fuel mixture. This is important especially for cars with forced induction, raised compression ratios or other modifications which are more susceptible to detonation or knock. You also get the best power output, which is awesome in all cases.
- Excellent value as a combination with better radiator or other cooling upgrades. Coolant reroute allows you to exploit capabilities of your new shiny radiator even more by putting more heat from the engine to your cooling fluid.
- Peace of mind. Last but not least it's great to know you did a good job, whatever your tuning or driving style is. Coolant reroute is a reversible modification to your car and has no downsides if installed correctly. Even the parts we provide are reusable (except for gaskets), so you can't go wrong. It's always nice to be on the safe side.