Fur Trapper · Oct 20, 2011

Sean said:
nooooooooooooooooooooooooooo

however you want to spell it

nooooooooooooooooooooooooooo

Cetane number - Wikipedia, the free encyclopedia

Ok to carry this on we need to identify what the cetane level would be in veg oil. My thinking is if you use a 50% blend on veg to diesel you would lower the cetane level of the mix by 50% and by adding cetane to it you would be close to the over all cetane rating of pure diesel? Just my thought!!

Sean · Oct 20, 2011

Fur Trapper said:
My thinking is if you use a 50% blend on veg to diesel you would lower the cetane level of the mix by 50%

that's nonsense, unless the oil had a cetane rating of zero

Fur Trapper · Oct 20, 2011

Sean said:
that's nonsense, unless the oil had a cetane rating of zero

Just looked it up and rap seed has a rating of 50-60 on the cetane scale and that was for unused oil. So no need to add cetane to the mix (but i would)

CharlesY · Oct 20, 2011

Fur Trapper said:
Just looked it up and rap seed has a rating of 50-60 on the cetane scale and that was for unused oil. So no need to add cetane to the mix (but i would)

Why would you go to this expense?

The ONLY issue that matters is this - does the engine start up and then run cleanly with about the usual power?

If so, what's the problem?

CharlesY

Heavy Breather · Oct 21, 2011

CharlesY said:
Experience here says do NOT use petrol for thinning down the oil.

Even quite a small amount of petrol seems to cause very poor ignition in 300tdi and TD5 Disco.

I suggest you do exactly what you are doing except FORGET THE PETROL.
I think you will be good at a 50-50 mix even without the petrol.

Remember, every litre of freebie oil you add to the tank saves you about £1.35 these days. If you go 50-50, your fuel is costing 67½p a litre.
That has to be good.

CharlesY

I was going off Shifty's set up, he adds 20ltr petrol to 180ltr oil. I'm running a 200tdi and a TD4 (not tried it in the freelander yet). Its smoking like hell on the currant mix, could that be the petrol, maybe its a little to thin?

Heavy Breather · Oct 21, 2011

Whats the thoughts on using oil in the TD4?

Might cetane help cut down on the smoke, the 200 has only done 108k, was smoking on start up before but only on start up

Shifty1962 · Oct 21, 2011

The reason I add the petrol (could use parafin, white spirit, etc but would have problems explaining to the revenue bods why it is in my tank) is to thin the stuff for filtering and give the fuel pump an easier time - especially now its getting colder.

Actually I use 20 litres to 200 litres but its not an exact science. I get the contaminated petrol from my mates garage which he pumps out of mis fuelled motors.

As the weather draws in I then mix home brew with pump derv at about 50% to keep the smoke down. During the hotter weather I use 75% home brew to 25% derv. My motor will run on neat home brew but it does smoke a tad too much for my liking.

The Mad Hat Man · Oct 21, 2011

Heavy Breather said:
Whats the thoughts on using oil in the TD4?

Might cetane help cut down on the smoke, the 200 has only done 108k, was smoking on start up before but only on start up

TD5?
TD4?
200TDi?

Heavy Breather · Oct 21, 2011

The Mad Hat Man said:
TD5?
TD4?
200TDi?

?? I don't have a TD5

Not tried it in the Td4, whats the thoughts on putting oil in it, with derv of course.

My 200tdi is smoking like hell on 33% oil,

Bromsgrove Defender · Oct 21, 2011

Heavy Breather said:
?? I don't have a TD5

At the risk of bein contravershial take a look at the name of the fred

Shifty1962 · Oct 21, 2011

Heavy Breather said:
?? I don't have a TD5

Not tried it in the Td4, whats the thoughts on putting oil in it, with derv of course.

My 200tdi is smoking like hell on 33% oil,

I'm no expert on the tdi engines but my guess is that your motor is not combusting properly. Could be low compression due to rings or valve seats or more likely a bad injector spray pattern. At 33% it should be virtually identical to running on derv with no smoke unless you give it full throttle at low revs. I'm sure there are tdi experts on here with more knowledge than me though.

Heavy Breather · Oct 21, 2011

Bromsgrove Defender said:
At the risk of bein contravershial take a look at the name of the fred

We went off the cooking oil very quickly so fred title don't mean much now lol

Bromsgrove Defender · Oct 21, 2011

Heavy Breather said:
We went off the cooking oil very quickly so fred title don't mean much now lol

Fair point

Heavy Breather · Oct 21, 2011

I tend to use it for very short runs, still only done 92 miles since putting the ol in, i'll take it for a longer run this afternoon. It is bad when its cold but eases off even after a mile or so.
I'll red up on the injectors and clean them see if that helps, may take me a while as i've broken a bone in my right hand lol

Fur Trapper · Oct 21, 2011

Bromsgrove Defender said:
At the risk of bein contravershial take a look at the name of the fred

Well technically petroleum comes from plant matter

under extreme pressure

so he's not really off base

johnlad · Oct 21, 2011

Heavy Breather said:
I tend to use it for very short runs, still only done 92 miles since putting the ol in, i'll take it for a longer run this afternoon. It is bad when its cold but eases off even after a mile or so.
I'll red up on the injectors and clean them see if that helps, may take me a while as i've broken a bone in my right hand lol

you broke that bone in August, been off work with it ever since, you cant use it for an excuse for your truck smoking

Heavy Breather · Oct 24, 2011

johnlad said:
you broke that bone in August, been off work with it ever since, you cant use it for an excuse for your truck smoking

I bloody well can

AND you saw me holding my back earlier!!!!

Bonemachine · Oct 25, 2011

do you have to notify HMCE if your using diesel/oil mix? :confused2:

Shifty1962 · Oct 25, 2011

The reason for doing it is to save money. If you tell them they will want you to pay fuel duty which kind of makes it not worth doing. :doh:

Me - I dont tell the tax man anything. Its his job to find out if he wants to know. The biggest con job ever pulled was to get people to accept doing their own tax returns as normal.

LR90 · Oct 27, 2011

Shifty1962 said:
The biggest con job ever pulled was to get people to accept doing their own tax returns as normal.

Amen to that! :doh:

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