It’s been a while since I had anything to say on my HHO installation, so here’s the very latest.

Last weekend I decided to uninstall the unit from the Prado.

My biggest stumbling block was finding a reasonably priced container for the vehicle.  For an HHO unit to work it had to be totally suitable for long hours in the rough and tumble of a 4WD and unfortunately the poor old poly pipe that plumbers use just didn’t do the trick.  It distorted badly with the heat, as a 4WD can often spend hours travelling along tracks at very low speeds and generating lots of heat in the engine bay and also, the magnificent one way valve I had fitted caused a vacuum inside the unit as it cooled.

Now the vacuum I could deal with, but the distortion after 10 plus hours of operation was another thing.  I priced up a stainless steel pipe with screw on fittings, to find I would be up for around $300, just too expensive.

Also, the Prado is an electronic controlled vehicle with sensors everywhere.  Normally on a cold start the engine would automatically jump to a 1500 RPM idle speed, but towards the end of my testing, this wasn’t happening, it would only be around 800 RPM and I would have to give it a couple of revs to get it to fast idle.

With the unit disconnected, I decided to give the intake system a clean with Subaru upper cylinder cleaner.  This is the most amazing cleaner out there and I would recommend anyone to give it a try.  After spraying it into my throttle body, next morning, the car wsa back to its proper cold start with a 1500 RPM idle.

Petrol prices have now come down, so I have decided to shelve the whole project.  I did receive about a 10% increase in mileage while using it, but now, certainly cannot justify the building expense.

See you pout there!

Related posts:

1. I am building an HHO generator to save 20% on my fuel bill
2. HHO Part 3
3. HHO Part 2
4. HHO Part 4