MrMoMo
That's not rust, it's Canadian patina...
So the other day I'm thinking about where I will be connecting the WVO system to the Diesel system.
The current plan was to remove the existing diesel line from the input to the fuel feed pump (mounted on the side of the injection pump).
A friend mentioned it would be better to splice into the hose going FROM the factory fuel filter, as it would greatly reduce my purge time. (he is not a toyota diesel guy). As true as it is, AFAIK without running through the feed pump, I would not draw any WVO from the tank - so I think that's out of the question (unless I installed a seperate pump)
So... that got me to wondering what my purge time would be...
Lets just say the stock filter is 0.5L volume, and the FP, IP & lines are ?0.5?L. This would mean I need to flow 1L of fuel to purge the injector lines of VO. Then I got to wondering how long this would take.
Very roughly, I seem to get about 14L/100km (70L gets me about 500Km). So, My figuring... if driving at 100km/hr I go through 0.23L per minute (14/60). If I need to purge 1L, it will take me approximately 4-1/2 minutes to purge the system (1/0.23 = 4:35)
That also means that when switching from diesel to VO, it will be 4:35 before I am actually RUNNING on VO!
35 minute drive, 5 minutes to heat up, 5 minutes to start flowing, 5 minutes to purge at the end, gets me 20 minutes of actuall VO running time... (until I really NAIL the time it takes to get the engine up to temp, and I can actually switch over before I'm up to temp because I know I'll still be running on diesel)
So that is about 57% of my commutes running on VO - not great, but still less than 1/2 the price it costs me now!
So... how is my math? does anyone know what the actual volume of the engine components are? (filter should be easy to figure out, but how about the rest?)
The only simple way I can see of getting around this, would be to use a pair of 3 port valves, one before the feed pump, and one after it. If the valve before the feed pump is on diesel, the valve after the feed pump goes to the filter. If the valve before the feed pump is on VO, the valve after goes into the IP.
Am I making less sense as I go along? Should I just live with long purge times?
The current plan was to remove the existing diesel line from the input to the fuel feed pump (mounted on the side of the injection pump).
A friend mentioned it would be better to splice into the hose going FROM the factory fuel filter, as it would greatly reduce my purge time. (he is not a toyota diesel guy). As true as it is, AFAIK without running through the feed pump, I would not draw any WVO from the tank - so I think that's out of the question (unless I installed a seperate pump)
So... that got me to wondering what my purge time would be...
Lets just say the stock filter is 0.5L volume, and the FP, IP & lines are ?0.5?L. This would mean I need to flow 1L of fuel to purge the injector lines of VO. Then I got to wondering how long this would take.
Very roughly, I seem to get about 14L/100km (70L gets me about 500Km). So, My figuring... if driving at 100km/hr I go through 0.23L per minute (14/60). If I need to purge 1L, it will take me approximately 4-1/2 minutes to purge the system (1/0.23 = 4:35)
That also means that when switching from diesel to VO, it will be 4:35 before I am actually RUNNING on VO!
35 minute drive, 5 minutes to heat up, 5 minutes to start flowing, 5 minutes to purge at the end, gets me 20 minutes of actuall VO running time... (until I really NAIL the time it takes to get the engine up to temp, and I can actually switch over before I'm up to temp because I know I'll still be running on diesel)
So that is about 57% of my commutes running on VO - not great, but still less than 1/2 the price it costs me now!
So... how is my math? does anyone know what the actual volume of the engine components are? (filter should be easy to figure out, but how about the rest?)
The only simple way I can see of getting around this, would be to use a pair of 3 port valves, one before the feed pump, and one after it. If the valve before the feed pump is on diesel, the valve after the feed pump goes to the filter. If the valve before the feed pump is on VO, the valve after goes into the IP.
Am I making less sense as I go along? Should I just live with long purge times?