This sounds crazy. Anyone know?

[spinning wheels]

Originally Posted by El Jay

In the olden daze, the water injectors were used to help control detonation on cars & trucks that were working real hard, like pulling a trailer, etc.

It was an after market "sprayer" that had a nozzle going through the top on the air cleaner.
If the engine started to detonate, the driver turned on the water & let it spray into the carburetor.
A lot of folks made their own using windshield wash pumps instead of paying premium $'s for an aftermarket kit.

June 2009 issue of Hot Rod magazine, has an article on water injection.