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We have developed a practical vapor system, involving adding fuel and additional air to the PCV hose. There are problems to be overcome in such a system. The main obstacle is getting the engine to idle properly. You need to add enough fuel to make a difference at cruising speed, yet not cause it to idle excessively high. You also need to add the correct ratio of fuel and air to get the best gains. We have found that a mixture display is essential to adjust the system. This system has resulted in an immediate 10% mileage gain. This is on top of the 18% resulting from the steam injection and mixture controller.
DANGERS
Remember a lean condition is potentially damaging, and a rich mixture can very quickly heat up your catalytic converter. This can destroy your converter or worse still, cause a fire under the car.
Leaking fuel is always hazardous, so use quality parts and check all connections. Always use hose clamps on fuel line, don't simply rely on tight fitting hoses.
SYSTEM SETUP
Our system is incorporated into the existing PCV add ons described previously.
A 'T' piece is installed in the PCV hose close to the steam inlet, between it and the inlet manifold. To this is connected our cold vapor system. Any unvaporized fuel reaching this point will then encounter hot steam, and have more chance of fully vaporizing before the inlet manifold. The vapor hose is about 2 feet long, 3/8th inside diameter. There is another 2 feet of hose after the 'T' before the manifold.
The amount of air is regulated by a metering orifice close to the connector. Fuel is admitted at another 'T' close to the open end. The fuel flow rate is controlled by a simple restriction in the fuel line. We use a short length of copper tube to join the fuel line, with it's ends flattenned. Trial and error in the flattenning is used to adjust the flow to the desired rate. Only a tiny hole is needed.
In carburettor vehicles, tap into the fuel line just before the carb. In EFI vehicles, tap into the fuel return line. The main fuel line has way too much pressure.
We found it essential to use a fuel solenoid to turn off the fuel when the engine is off.
It was also essential to turn off both the fuel and the air at idle. The amount of air and fuel that is necessary to make a difference at highway speeds, is too much to allow for normal idle revs. We have designed an electronic controller that does this. It also has a dash board indicator to show the functioning of the device. This controller also monitors the output of the mixture controller ( if installed, or the simple Mixture Display output can be used. This is shown on the previous page.) and cuts the fuel if a rich condition exists for a preset duration.
* NOTE * This system setup will only work if your PCV hose is connected to the manifold in a location that will distribute the vapor evenly to all the cylinders.
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