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Author Topic: Fully Mechanical Water Injection  (Read 7601 times)
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CTX-SLPR
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« on: February 19, 2013, 04:03:36 PM »

I'm not sure if I'm over interpreting the prohibition on electronics in the Classic classes to include no MAP based water injection controllers but I came up with this idea while rocking one of my son's to sleep in the middle of the night.

Water injection using the principles of mechanical fuel injection.
Pump: modified mechanical fuel pump with a methanol compatable diaphram, boost refferenced, and with a return line due to the small amounts of fluid moved.  Alternatively an electric pump and external regulator.
Regulator (instead of a refferenced pump with return line): Potentially an E85 compatable refferenced return regulator.
Volume Controller: Small barrel valve with a large bypass jet with a spring and pnuematic ram on the arm so that the valve opens in proportion to boost pressure.
Injectors: Perimeter injection style plate under the carb.

Considerations.
From reading up on the combo of carbs, turbos, and water injection; it looks like it is not advisable to run water through the turbo or the carb.  The turbo because if not properly sealed will get water into the oil and it may damage the compressor.  The carb because it displaces air and will play havok with your jetting.  This means I would have to have pressure above the boost pressure on the water since it's past the compressor.  Additionally I'd need anti-siphon valves to keep the engine from pulling the water in under vacuum and when it's off.

Does this seem unworkable?
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« Reply #1 on: February 20, 2013, 09:36:51 PM »

I bought a system from Snow. It is boost referenced, and has an electric pump rated at 150 psi, and is legal in vintage and classic classes.

If the tank is located lower than the nozzle, with the boost referenced solenoid, it will not siphon into the engine.
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