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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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Volvos and chip fatViews : 11934 Replies : 127Users Viewing This Thread : |
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Dec 28th, 2007, 20:19 | #111 |
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Veg Oil
Engineer is wrong to say its legal,unless you declare it to HM revenue you cant use veg oil from tesco or anywhere else in a motor vehicle on the public roads as you havent paid tax.Google veg oil in cars there are a ruck of sites on this issue.Mick
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Dec 28th, 2007, 20:32 | #112 | |
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Quote:
Historically in the U.K, H.M. Revenue and Customs (HMRC) levied a fuel duty of 28.35 pence per litre for all vegetable oils that meet the fiscal definition of what's confusingly termed ‘biodiesel’. This represented a discount of 20 pence on the normal duty level for conventional diesel. However, it has cost HMRC more to police and process payments from private users/producers than the revenue generated. From 1 July 2007, users/producers of 2,500 litres or less per annum will no longer be required to submit a monthly return (although existing producers will be required to keep basic records for an additional 6 years). This means the use of compliant vegetable oils will be DUTY FREE for the private motorist. The HMRC’s web site - http://www.hmrc.gov.uk/briefs/excise-duty/brief4307.htm
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Dec 28th, 2007, 21:05 | #113 |
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cost caculator
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Dec 28th, 2007, 22:17 | #114 | |
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Quote:
Also forgot to add that the +12V is from a swithced supply (i'll use the feed to the IP fuel valve ), but the feed for the heater will be direct fromt he battery. TFB Last edited by tfb; Dec 28th, 2007 at 22:21. |
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Dec 28th, 2007, 22:58 | #115 | |
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Quote:
Roy
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Dec 29th, 2007, 10:06 | #116 |
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Electrical drawing Rev2. Updated with DLM48's comments.
1) Auto/Purge switch moved to between the Changeover and Filter heater relays 2) Diode added to prevent a back feed picking up the Filter Heater relay when the purge switch is operated 3) More labeling added 4) Now shows which parts of the cct. are fed from the permament live and which are fed from a switched live 5) www.rswww.com down so I can't spec the relays Note cct is show in it's de-energized state, that's why the contact for the filter heater is shown as open Regards TFB |
Dec 29th, 2007, 11:58 | #117 | |
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Quote:
Just my view(s) of course
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David Past - 360 GLT - 745TI - 398K miles gone to Ireland 945 SE TD 230K AWESOME CAR - 855 2.3 20V GLT V70 Classic 2.4 20V sold on VoS FB page in a few hours Present - C70 2.4 SE GearTronic - V70R AWD Prins II LPG 2.5 GearTronic |
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Jan 8th, 2008, 13:23 | #118 |
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Well, I had a few minutes over the last couple of days to tinker with Volvo . I was curious to find out the operating specs of the Elsbett electric fuel heater, the new glow plug control and the fuel temperature.
The Elsbett supplied control relay keeps the glow plugs running for 180 seconds after the engine starts as long as the coolant temperature is under 70 degrees C. If the coolant temperature reaches 70 degrees C within that 3 minutes, then the glow plugs are turned off. If the ignition is turned on but the engine not cranked then the glow plugs turn off after 14 seconds. The electric fuel filter heater is also controlled by the glow plug control circuit. I have had my doubts as to the effectiveness any form of electric fuel heater, I can't see how you can dump enough energy into the fuel to make much of a difference. As the Elsbett heater is only running for the same length of time as the glow plugs, this really doesn't allow much time for heating at all. I got hold of a little inline fuel filter and melted a hole in the side and glued a temperature probe into it (see attached pic). I then put the filter between the heated filter and the injection pump. With the car parked on the drive and the engine idling I recorded the temperature every 10 seconds. I did 3 test runs. 2 were for 4 minutes and one only lasted 2 minutes as I was interrupted with “ Daaaaaddd, George has stuck my Polly Pocket up his nose!”. The three runs were: 1.Coolant heat exchanger in circuit and electric filter heater on 2.Coolant heat exchanger in circuit and electric filter heater off 3.Coolant heat exchanger out of circuit and electric filter on I did each run in the morning after the car had been standing overnight to ensure that the engine and fuel were at ambient temperature. Interpreting then results: The initial fuel temperature varies for each run, as this was what the ambient temperature was at the time, the important part of the results is the shape of the curve which is the rate of increase. As can be seen from the resulting graph (see attached file) There is no increase in fuel temperature for about 60 seconds, then the tests with the coolant heater exchanger in circuit show the temperature starting to rise. The electric heated fuel filter takes over 90 seconds before any rise in temperature is seen. I suspect the slight fall in temperature during the first 50 seconds of each run is due to my handling of the temperature probe warming it up slightly and it being cooled by the fuel. The variation is only 0.5 degree but as it occurred on every run it can't be written off without an explanation. Despite the low rate of increase seen from the electric fuel heater, I will leave it in circuit in case at some point I start to use waste vegetable oil and it should help prevent the filter from clogging up with wax before the coolant has hit 70 degrees and I switch over to veg. I did one more test run of taking the car for a quick spin around the Fens (about 10miles) and found that the fuel temperature stabilized at about 62 degrees C and it took about 2.5miles for the coolant temperature to reach 70 degrees C and the Elsbett supplied temperature switch to operate. Next planned experiments are to measure the viscosity of diesel, diesel/SVO mix and pure SVO at various temperatures. Regards TFB |
Jan 8th, 2008, 13:57 | #119 | |
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Quote:
Thanks for the useful info. I can see why Smartveg have chosen not to bother with fuel heaters now. Roy
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Jan 8th, 2008, 14:13 | #120 |
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This isn't the article but it does have some information and gives information on Elsbett's tests & reasoning. Also of note is the use of Plantmot engine oil and the absense of lacquer.
http://www.ilot.edu.pl/2005%201_2%20...bialkowski.pdf Roy
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1984 245 SE 1986 345 SE Auto 1991 940 TD Auto 2003 XC90 D5 SE AWD Geartronic2002 V70 D5 SE Auto 2014 V40 D2 SE Tiptronic Cross Country 2017 V40 D2 Cross Country Geartronic Pro 2015 XC60 D5 Polestar SE Lux Nav AWD Geartronic Last edited by RoyMacDonald; Jan 8th, 2008 at 14:21. |
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