Veg oil mixtures and %

Hi all - wanting to find out what you veg oil burners mix with, and how much.

I found that getting closed to 70% WVO / 30% derv was causing lumpy running at low RPMS.

Anyone mix with a little petrol?

Why not go the whole hog and run it on bio? You'll get the money you spend on a processor back in no time.

Thought about it, but its the chemical aspect that puts me off.

I have very limited space to do what I can do, as well, its not fee sable at the moment.

Plus my supply of WVO is patchy on times.

10 ltr diesel to 5 veg i do this time of year.you could put a cap full of petrol in just to clear thru any ****

Have you ever tried going any further with it?

5% unleaded 95% veg,

unleaded thins a lot better then derv.

Do you run that mix hifly or is it something you know of? am only interested in real-life, not theoretical stuff.

Ran petrol in my transit, she loved it lol

In his hot weather i run 5050 mix.not worth running 100 veg as if it goez lumpy ya ####ed

I pushed it to 70/30 and it went a bit lumpy, but still was OK.

Never run it on WVO but on SVO I have been running 90% with a little slower starting but once warm sweet as a nut, lttle smokey but then again my injection pumps tuned up to the 9's

Twin tank and 100% WVO/SVO is the best way to go. Only way that doesn't damage the engine

Have been thinking about that for a while, running a seperate tank in the boot for veg, or maybe even using the main tank for derv and a 2nd tank for WVO in the boot area. Not sure how id plumb it in though.

In cooler weather I hardly run any veg, maybe 30% and in winter non at all.

I have run 95/5 wvo/unleaded in warm weather ok.

best thing is to mix up 2 lots of 20l and when the tank is really low put one in and see how it goes if that one was ok when it gets low a gain put the other one in, there will be less derv in the tank the second time, if its still ok i would say you are fine to fill up.

if it causes problems starting i would add 10% derv and do the above again.

I mostly make bio at the moment as i have a load of solid veg oil to use up during the summer but i do mix in some liquid wvo from time to time and some miss fuel when the weather starts cooling down

Never had problems starting, mine gets lumpy holding around 1800 rpm.

Isnt that about the rev range the boost pipe begins to push down the diaphram in the injection pump? Mine does it when on veg aswell but I put it down to having it turned up.

Possible.
Once im up over 2200 rpm its smooth again. Problem is, 5th gear, 30-35 mph is right in that range

Perhaps there isnt quite enough boost to push the thicker fuel down? Thats the first explanation I have seen about this.

Im wondering, as some people say shortening the actuator rod will adjust the turbo (am i wrong here) - that will move this to a different RPM... maybe im going off on one here.

I am not a mechanic and could be wrong but heres what I think is happening.

The injection pump relys on pressure from the turbo to puch the diaphram and delivery rate rod down, this increases fuelling and boost increases giving the right mixture, clever huh.

So at the point we are getting lumpy running tells me there is either not enough fuel to air or too much fuel to air. It is probably not enough fuel to air as you say the fuel is thicker and will take that little bit more of a push to come through and so at that precise point the boost is supposed to help the pump there isnt enough boost at that rev to deliver enough fuel.

See I have a boost gauge and EGT gauge and tuned it to its safe potential, and the judder I feel is only when revving not in gear, when in gear and under acceleration I dont feel anything. You could try and turn your smoke srew in half a turn and see if that helps, maybe adjust the diaphram a couple of degrees to get that extra fuel in before boost takes over.

Jay

Hi, I run mine 50/50 all year long, year before last it was -19 in the winter so I just put 5 ltrs unleaded in with it, it ran like a dream !

Yep, my pal runs 90% veg 10% unleaded it's sweet as!