[hotrod]

Welcome to the forum.

From a performance point of view, water injection has no real down side. It allows significant performance increases for a very small investment in equipment.

The reason it is not offered on production cars, is due to the experience a few manufactures had when they made it available many years ago (The Olds Jet fire for example). The average driver does not remember little maintainence tasks. The result is they let the water tank run dry and cause problems when a highly tuned engine is suddenly without its water injection. This is not a problem with racing engines as they generally are good at keeping important fluids full.

Long term damage due to the water going through the engine is not a problem. Burning gasoline produces a huge amount of water vapor. Your engine has no problem with that water vapor and the small additional amount produced by the water injection will not cause problems except in unusual situations.

If a system continues to flow water after the engine is shut off (modern systems are designed so this cannot happen), or running heavy amounts of water injection in an engine that is never allowed to warm up completely, or running dirty water that plugs the jets are about the only problems you can have.

Larry