Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Debs.]

Being a bit 'sad'; I`ve been conducting a test on the low temp. behaviour of pump diesel and my 50% DERV/Rapeseed-oil home brew.

Equal sample-volume jam jars, on same shelf of freezer at -20 C. for 12 hours.

1: 100% Shell DERV....no 'clouding' but a slight change in viscosity. Useable

2: 100% Total DERV....no 'clouding' but viscosity better than the Shell sample. Useable

3: 100% Morrisons DERV....visible 'clouding' with clearly degraded viscosity. Useable; but may clog an older fuel filter

4: 100% Asda Rapeseed Oil.....serious viscosity change resulting in a syrup. Not Useable

5: 50/50 Shell DERV & Rapeseed....'clouding' (with swirling threads of linked-platelets visible) and thickened. Not Useable


6: 50/50 Total DERV & Rapeseed....'clouding' and somewhat thickened Useable; but may clog an older fuel filter


7: 50/50 Morrisons DERV & Rapeseed....'clouding' and very thickened. Not Useable


8: 50/50 Total DERV & Rapeseed (but with Lucas Extreme Winter Fuel Additive* at 5 ml/litre) uniformly-cloudy, no platelets visible and viscosity only slightly thickened. Useable; homegeneous suspension of platelets (unlikely to clog)

9: 100% Morrisons DERV (but with Lucas Extreme Winter Fuel Additive* at 5 ml/litre) uniformly-cloudy, no platelets visible and viscosity only marginally thickened. Useable; homegeneous suspension of platelets (unlikely to clog)
*http://www.lucasoil.co.uk/products.php?page=products&subpage=product&product=79

Samples were allowed to return to room temperature and all returned to previous state.
The test was then repeated with the freezer on 'fast freeze' and sample jars in front of the evaporator fan; -35 C (or lower):
All samples with the exception of the additive-treated (No.8 & 9) became gelled to a 'nul pour' state.....samples 8 & 9, although thicker and were both uniformly clouded, continued to be pourable and would certainly flow through pipes/filters.

Conclusions:
Sample 3 was a surprise, I expected pump DERV to be pretty much all the same; but 100 % 'branded fuel' did seem to be better performing when very cold than the supermarket sample I tested......but when it gets really cold; use an additive.

[millwall]

well done debs should definately be helpful for the oil burner owners

[Andy B]

....
 I`ve been conducting a test  ..... on same shelf of freezer at -20 C. for 12 hours.

 .....

and that is where my test would fail ..... 
I don't Mrs Andy B would be able to see the worth of any test that required diesel to be put in our her fridge freezer!     

[hoofing it]

Are you feeling a bit board on these long dark nights Debs
Intresting reading

[Kevin Wood]

Judging by the bottle of cooking oil Mrs. KW has stored in my garage (at only a degree under freezing) you wouldn't want any of that in your fuel tank either.

Very interesting. Perhaps a clue that Morrisons are skimping on the additives?

Now, how long will the after-taste be present in the cuisine at "Chez Debs". 

Kevin

[Omegatoy]

Debs, very old trick to prevent dieel clogging was around 5 percent of petrol or white spirit, thoroughly mixed of course,if you still have the test jars may be worth a try?

[Agemo]

That was very interesting, I am assuming this is not used Rapeseed oil?

[Debs.]

That was very interesting, I am assuming this is not used Rapeseed oil?

No, straight from the supermarket in 3 ltr. containers......although, watch out as sometimes the single litre-sized bottles can be even cheaper (but more of a faff)

The used-oil thing is more risky (IMHO) as it`s a more variable commodity....I shop about and the new oil is cheap enough when it`s on offer; as it frequently is in Tesco/Asda/Netto etc......if you have a Costco or Makro card then Rapeseed can be had in 20 litre drums.

[Agemo]

Right, yes I agree with you about used, it takes a lot of filtering, plus getting rid of any water. I may experiment then. . .