I spent a good deal of Monday playing with waste engine oil.
Bitsa now has a tempory fuel tank for waste oil, which is fed via a shut off cock to the lift pump. The main pipe from the diesel tank has also gained a shutoff cock.
With the engine warm, it idles sweetly on waste oil, but it seems to suffer from starvation if you try and drive it - I got about 500 yards before the engine started dieing, but after a bit of cranking it would restart and idle again. The next stage in the experiment is to try warming the oil, so it passes through the filter much faster - I did build a rather bodgy heat exchanger, but I've yet to plumb the coolant side in. If that doesn't help matters, I think I'll need seperate fuel pumps and a larger filter (the standard one is on the small size for a 200 anyway).
It does however run fine once warm with both fuel cocks open - the level in the waste tank has dropped a bit - I think its running about 10% waste to 90% diesel given the amount of waste used... not a massive saving, but still worth having. I took her halfway round west yorkshire like this, with no problems, although she was a little slower to fire up than usual after being stood for a couple of hours... if I'd knocked the waste tap off a couple of miles before parking up, I expect she would have been fine.
As I type
10 years ago