Veg oil mixtures and %

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
KevAmiga

KevAmiga

Active Member
Posts
174
Location
Swansea, South Wales
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?
 
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.
 
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
 
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
 
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.
 
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
 
Last edited:
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
 
You must log in or register to reply here.

Similar threads

D
Camshalf oil leak
Replies
2
Views
520
discoverysean
D
Bustrucket
Disco 2 Td5 Overheating
Replies
3
Views
925
johnlad
johnlad
akosmo1
Series 2.25 petrol Thick black smoke
Replies
3
Views
1K
Anaconda
A
P
L322 TD6 lost all drive
Replies
5
Views
486
backinblack
backinblack
MikeFl4
P38A Possible coolant in oil
Replies
9
Views
1K
Datatek
Datatek
Back
Top