brnsgrbr
Veteran Member
Interesting to me that no one is talking about trying to use the new GM fuel filter. I am going to look into this!
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Just a minor correction - the post injection does not burn in the cylinder. It is vaporized and heated, it then makes it's way to the DOC/DPF where it ignites and facilitates the regeneration cycle of the DPF.It is due to a small injection of fuel after the combustion stage. It is how the manufacturers chose to meet the new SMOG regulations. Regular diesel burns at a much lower temperature than biodiesel and the post combustion pressure and temps are not enough to completely burn the biodiesel, whereas it will burn the diesel #2 fuel.
Holy Crap! This is awesome!http://www.forbes.com/sites/martinlamonica/2012/09/17/audi-places-its-biofuel-bets-on-joule/
"The deal with Audi helps validate Joule’s technology and gives Audi a potentially important relationship as it seeks to be a carbon-neutral driving. “Joule and the fuels it is developing can ultimately enable sustainable mobility, as its highly-efficient process consumes waste CO2 emissions, avoids depletion of natural resources and doesn’t require agricultural feedstock or arable land,” says Reiner Manglod, the head of environmental products at Audi in a statement."
http://www.jouleunlimited.com/
"Joule’s renewable fuel platform will best the scale, productivities and costs of any known alternative to fossil fuel today, with no reliance on biomass feedstocks or precious natural resources. Our inputs are sunlight, waste CO2 and non-potable water. Our output? Millions of gallons of clean, renewable fuel that drops into existing infrastructure. Next step: change the world."
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Just an aside but looking thru a few of the oil analyses shows that fuel in the oil does not seem to be an issue with this engine.From what I've talked to several guy's in the chat about this topic is that when the newer TDI's go into Re-gen they put extra diesel in the exhaust stroke which ends up down past rings into oil... diluting the oil with the bio-diesel over 10,000mi oil changes with the "VW Spec" oil will cause the oil not to be protective enough and do engine wear/damage.
I've read a lot of replies to this effect, but I read one other that finally clicked. The thing is that biodiesel has a lower ignition temperature than D2, and so it should more easily ignite. The exhaust temperature is well above the ignition point of either fuel, so both should ignite in the combustion chamber......
But then the basic reasoning is sound - the biodiesel has a higher vaporization point than D2. It condenses on the cylinder walls and runs down to drip into the crankcase.
Maybe some of the engineers could chime in with the specifics?
Jason
Is VW still recommending biodiesel in Europe, or has that now changed too?It is due to a small injection of fuel after the combustion stage... Regular diesel burns at a much lower temperature than biodiesel and the post combustion pressure and temps are not enough to completely burn the biodiesel, whereas it will burn the diesel #2 fuel.
So, we convert all of the foodstock and feedstock land to producing plants for fuel. What will we then use for putting food on the table? I would rather eat and feed my children than drive.I find it funny the scrutiny of the energy and water needed to produce stocks for fuel, but yet no one looks at the same energy waste for food production. There is a HUGE loss of energy and water in the production of food crops everyday. It is all a NET LOSS in the world.
Therefore I think this is a non-sense argument against growing crops for fuel. The point is that oil will be gone one day so we will need to have some alternative if we are to continue our economies as is.
It's unlikely that using B99 at that mileage has had any detrimental effect on your fuel system components. Persistent long term use of B99 is another matter entirely. A used oil analysis would tell you how much dilution has taken place and my own educated guess would be not that much in a new engine with good compression. There is an outside chance that the nozzles have clogged but I think its unlikely over just a few thousand miles. The risk is even lower if it was properly refined and sold from a reputable retailer. However it does affect any warranty claim if the dealership knows that you went above the mandated allowable amount of 5% bio.Aloha Kai and others. Writing fr Honolulu and new to this forum. Really appreciate all the info and opinions here. I have a 2011 Golf TDI with 12,400 miles on it. I started using B-99 from Pacific Biodiesel (at the 76 station on Nimitz Hwy) about 7 months ago, at about 6000 miles. I use the b-99 about 80% of the time, the other 20% of the time is the B-5 standard. I had it serviced at 9300 miles as part of the warranty where they installed fuel line dampers but made no mention of anything regarding the biodiesel or any clogging of fuel lines etc.
Yesterday the car would not start, it got towed to the Honolulu VW dealer for servicing. Right away without looking at the car, they said if i was using biodiesel that the warranty would not cover and that it would likely be there for a month and cost $5-6k to replace the entire fuel system.
My main question is: Was biodiesel really the cause of what they are saying is a failed fuel system
My follow-up questions are:
- How much biodiesel does it actually take to make the system fail (based on receipts fr my fill-ups I have a high estimate of 120 gallons of b-99 have been put in the car)
- should I be questioning the service ppl about the HPFP failures that I've been reading about? and therefore should I report this on the NHTSA site?
- I'm 50% of the way through my 3-yr standard warranty, if I want to stick with biodiesel, should I just not get it fixed at the dealer, walk from the remaining 18months on my warranty, and find another mechanic to install the proper fuel lines to support biodiesel?
Any and all help appreciated!
Oil dilution is not the only issue with running high concentrations of biodiesel in a new (CR) engine. The extreme pressures (over 26,000 psi) and the resultant high fuel temperatures encountered in our fuel injection systems can (and will) cause biodiesel to oxidize. This can lead to clogged injectors and unwanted deposits in other areas. I would strongly advise not going much over the officially recommended 5% bio. Up to 10% is probably relatively safe, but why push your luck.A used oil analysis would tell you how much dilution has taken place.
See my edited post on possible clogging of nozzles. The extreme pressures (over 26,000 psi) and the resultant high fuel temperatures encountered in our fuel injection systems can (and will) cause biodiesel to oxidize. This can lead to clogged injectors and unwanted deposits in other areas..
That's why i only ever use Bio from a known reputable refining source.Another issue is that all biodiesel is not created equal. We tend to talk about biodiesel as if it was a single product - it is not. The source of the raw feed stock (soy bean oil, Canola oil, animal fat, or waste cooking oil - which can be a mixture of any or all of the others) can make a significant difference in the way the fuel behaves in our fuel injection systems. I choose to stick with petroleum based D2 whenever possible.
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No! You missed the point. You stop worry about the loss and just produce what you need.So, we convert all of the foodstock and feedstock land to producing plants for fuel. What will we then use for putting food on the table? I would rather eat and feed my children than drive.
You are in Ill.. VW says up to B20 is okay for you to use with the caveat that you need to watch the oil level and change it early if it is rising. From my reading B11 is the predominant product, so you should have no issues other than to check your oil regularly. There is a list in the midwest forum of stations that sell D2 only as well as the letterSo I'm the proud owner of a new TDI Sportwagen and I just completed my first fill up. I was low on fuel in the middle of work appointments and went to a station with diesel, but that nozzle wouldn't fit and I don't have an adaptor. So the attendant directs me to a station down the road with diesel. I get there to find out it's biodiesel and the pump gives a range of possible ratings, which I cannot exactly recall. I asked the attendant, who naturally said it was fine. Given my slightly pressured time and unknown distance to the next closest diesel station, I filled it up. I was caught off guard a bit as I really didn't know that biodiesel was so available. I kind of still thought it was a specialty thing that you had to seek out a bit. Anyway, I'm learning quickly and feel like I made a mistake with this fill up. From what I'm reading though, a single tank is probably not going to cause any problems, but was hoping for some input. I plan on sticking to the recommended 5% in the future.
Thanks for the feedback! Checking out the Midwest forum now.You are in Ill.. VW says up to B20 is okay for you to use with the caveat that you need to watch the oil level and change it early if it is rising. From my reading B11 is the predominant product, so you should have no issues other than to check your oil regularly. There is a list in the midwest forum of stations that sell D2 only as well as the letter
VW sent out. Drive on!