First things first, do some more reading and searching about conversions. as far as conversions go for WVO, I cant help you there. But I do have a 1HDFTE. I would not attempt to run it on veggie. The fuel pump for it sucks an enormous amount of fuel. its fuel lines are half inch. excess fuel is used for cooling and lubrication of the pump internals and is returned to the tank.
I run Bio in mine and difference between diesel and bio is very noticeable, mainly due to the slightly increased viscosity of the fuel and getting it through fuel filters at a high enough rate. I run 2 x parrallel high flow filters pushed by a mallory high flow low pressure fuel pump, which means the car is driveable on bio. thick veggie oil would be a disaster.
plenty of success out there with the 1HZ though. still a great engine, if underpowered for the beast. lower fuel flows (10mm lines as opposed to 12mm lines) and less electronics.
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