Meyer Micro Energy Lab
Pictures Under the Hood in my 1993 Geo Metro with Water Injection
First the Diagram Again

The water tank (A) has a vent tube (C) which connects to the exhaust manifold (I) and a water tube (B) that connects to the heating tube (D). The heating tube (D) is wrapped around the lower exhaust manifold (I), it connects to bottom of the boiler (E). Out of the top of the boiler is a tube to the needle-valve (F) then more tubing to a 'tee' fitting on an existing vacuum line (G), connecting it to the vacuum port in the throttle body (H), above the throttle plate.

A - Water tank

B - Water line from tank

C - Pressure/Vent line to tank

D - Heating tube

E - Boiler / Liquid-Gas seperation

F - Needle Valve

G - Existing vacuum line

H - Throttle Body

I - Exhaust Manifold

H2O-Injection Diagram

How does it work?

Water is moved thru the system by the combined action of the vacuum at the throttle body and exhaust gas pressure from the manifold. This 'balancing act' varies with driving conditions, modulating the amount of water to the engine according to need.

When water is heated in (D) and starts to boil, expansion of steam pushes back water towards the tank, providing some self regulation of water flow into the hot section, bleeding excess pressure back out the vent tube into the exhaust manifold and moving water/steam to the boiler (E) where it is further heated and space for seperation of liquid and gas can occur so that only steam is output thru the needle valve (F) being drawn into the throttle body (H).

Under-the-Hood Pictures

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