Biodiesel

MessickFarmEqu · Sep 17, 2004

Has anyone used biodiesel in their equipment. There seems to be a good bit of information on the internet that shoulds pretty favorable. One of my customers is investigating it because he feels that the exaust will be less irritating to him than traditional fuel. He is looking at a rather conservitive mix and I and our shop guys think it will be just fine in a Kubota BX. Any experiences?

Bob_Skurka · Sep 17, 2004

Neil, do a search on this. I think Junkman was considering this a while back??? If not him, then someone on TBN, there was a discussion on it earlier this summer. Me, I'm game to try it with some of the lovely Mrs_Bob's olive oil. To me, it has too strong of a taste, but it might smell better when it is mixed with diesel and run through a tractor engine /forums/images/graemlins/grin.gif

cowboydoc · Sep 17, 2004

We've been using biodiesel for a number of years. It is great. We haven't had any problems at all. The only thing you have to watch is in the winter. It will gel alot easier than diesel so you have to make sure you have additive in it.

qqq · Sep 17, 2004

( Has anyone used biodiesel in their equipment)
I'm still tractor shopping, so I haven't yet. But, I do use it in my diesel powered car (a VW TDI). You may want to try posting a message in the Biodiesel FAQ & Info forum over at www.biodieselnow.com. One of the frequent posters there (soypwrd) does have a Kubota tractor and is using B100 in it, so I'm sure he can provide some first hand experience.

He also has a TDI, and posts to a site similar to TBN for TDI enthusiasts. Here's a link to a recent message there concerning biodiesel usage in his Kubota.

( Me, I'm game to try it with some of the lovely Mrs_Bob's olive oil. )
I don't think you want to do this, biodiesel may be made from various vegetable oils, but its quite different than the raw vegetable oil that was the feedstock used in its production. Basically, a process called Transesterification is used produce the biodiesel, and the resulting product has the right chemical properties to be used in a diesel engine.

( One of my customers is investigating it because he feels that the exaust will be less irritating to him than traditional fuel. He is looking at a rather conservitive mix )
Sounds like he's proposing something like B5 or B20. If he's having a problem with irratating exhaust, he may want to try B100.

MessickFarmEqu · Sep 17, 2004

(
Sounds like he's proposing something like B5 or B20. If he's having a problem with irratating exhaust, he may want to try B100. )

That numbers are just the percentage mix of Bio and regular diesel right? Our local station says they have B2 and B5, why such a low concentration? Will that have much effect?

SkyPup · Sep 17, 2004

B2 or B5 is the Federal Mandated limit for the payment of government taxpayer funded subsidies to support the high cost of the production of BD from soybeans in this country, since it costs more to produce than what you can sell it for.

The use of B2 or B5 mixed into dino petrodiesel is basically good as it increases lubricity to the injection pump and the injection nozzles internal parts.

Use of B-100 is entirely experimental and will lead to injector coking and fouling as well as water contamination (BD is very hydroscopic) which is not good in any diesel engine.

SkyPup · Sep 17, 2004

Yanmar liquid cooled, 4 cylinder Direct injection diesel.

NOT GOOD.

Here is the programmed cycle and loading for the engines in the test:

5 minutes at 2200 rpm and 21hp (which is 62% of rated load at 2200 rpm), then 44 minutes at 1450 rpm and 10 hp (which is 37% of rated load at 1450 rpm), then 1 minute shutdown, restart at high speed and repeat.

The photos and weight percent analysis are interesting but did not give enough clues about the deposits. The two most likely sources for these deposits are thermal decomposition of the methyl ester molecule or thermal decomposition of the glycerin molecule. At temperatures of 430ºC to 480ºC, decomposition of Soybean Biodiesel occurs [1], therefore the possibility exists for the Biodiesel to decompose during the ignition delay period, resulting in injector tip deposits.

slowzuki · Sep 17, 2004

Some have had very good luck on B-100, depends who is making it, what kind of quality control is going on.

I think if one is going to go B-100 you should try straight vegtable oil instead. Much easier.

( Use of B-100 is entirely experimental and will lead to injector coking and fouling as well as water contamination (BD is very hydroscopic) which is not good in any diesel engine. )

SkyPup · Sep 17, 2004

You are correct that the quality or lack thereof of the BD product is very important, however here is the BD-100 fuel quality analysis sheet for the fuel used in this test, and as you can see it is high quality BD-100 without excessive glycerin, methanol, soap, or water.