Thread: Biodiesel use as a 2 stroke lubrication oil

Dave,I have great difficulty in reading and understanding your post.
Perhaps you should have someone proof read it and coach you in the use of spelling, capitalisation, punctuation and the use of paragraphs.
Oils do evaporate in the combustion chamber due to the high temperatures there. They also combust there - liquid fuel does not combust until it becomes a vapour.

You appear to be basing your premise, that biodiesel is good for your 2 stroke engine, because you have used it for a couple of hours.
Please come back and post your results, when you have used it for several hundred hours of hard work using biodiesel as the only lubricant in the petrol. I doubt that you will get 100 hours.

I will then be happy to discuss the results you have obtained.

I repeat:
Biodiesel is NOT a suitable substitute for 2 stroke oil.

Tony

DJ,

I do not (think) that Tony was having a go at you - but pointing out a very relevant fact - it is extremely difficult to follow a lot of your undoubtedly good information - on all of your posts.

One issue is the spelling, but your message comes across OK even with that. The bigger issue is that there are no breaks in any of your sentences.

You may not have had the benefit of a great education, however i do not believe that a person stops learning when you/they leave school either - so maybe you could put some effort into punctuation with your posts so that all of us could benefit from what you have to say.

regards

Craig

When I was writing technical articles for Australasian Dirt Bike magazine I did an article on two-stroke oils. There were several technical papers that I had access to. There were two different tests done on the wear characteristics of the various oils.

It used to be that castor oil was the best, however the newer synthetics have now surpassed the castor oils lubrication level, plus they will never gum up the engine.

Synthetic oils are chalk and cheese compared to mineral oils. There is no comparison for long term usage, the synthetics are far superior.

The best place to check and see if the lubricant is still working at temperature and pressure is the piston rings. If you see little brown or blue spots on the rings, that is where the lubrication has broken down and the ring has gotten hot rubbing against the cylinder wall.

Two strokes can use all sorts of lubricants for shorter periods of time. I once saw a guy finish a desert race using ATF as his lubricant. Another time a fellow seized his engine because he forgot to add oil to the fuel. He had a can of chain lube with him and sprayed that into the tank - and finished the race. So yes, you can get a two-stroke to run with all sorts of lubricants, how long it continues to run before it wears out is another issue.

I have read the technical papers on two-stroke lubricants. I would never use biodiesel as a two-stroke lubricant.

Dave,
I did not mean to offend, but was pointing out a basic fact. Your posts in general, and that one specifically, are very hard to read, due to the lack of paragraphs, capitalisation and spelling.
I did try to discuss this with you some time ago by PM, but you simply dismissed me and did not want to learn from what I was suggesting at the time.

Congratulations on posting a very readable post. Your use of paragraphs made it easy to follow. It is a welcome change and allows me to respond much more easily.

I believe that evaporation and vaporisation are the same thing!..
If I am wrong, will some other member please explain the differences to me.

My comments on the big and and main bearings relate mainly to lack of lubrication.

My comments about polymerised biodiesel in the bottom end relates to blow-by gases which, if biodiesel is used instead of 2 stroke oil, biodiesel will be present as unburned gases which will condense in the bottom end.
Mineral oil in the bottom end can evaporate or be picked up by the petrol/oil mix, and be taken into the combustion chamber. Ii is possible that this could occur with biodiesel blow-by products, but I have yet to be convinced that this is the case, and it is safer to avoid biodiesel for this purpose anyway.

I don't believe that vegetable oil is a suitable substitute for 2 stroke oil either.

i think you will try to put down everything i say that you dont like and woodnt accept anything you didnt want to and would come up with some story to make every fact seem wrong so what is the point. you havent run any 2 stroke engine with bio for even a couple of hours so i think i do no more about this than you do even if it is just a little bit.

I disagree, I do not want to put down anything of substance posted here, by anyone! Good information is valuable to the members here. The more good information we have the more benefit members can obtain from this site.

I also agree that your couple of hours using biodiesel instead of a lubricant in a 2 stroke engine is much more experience than I have in abusing 2 stroke engines.
I use 2 stroke oil and get good service life from my chain saws, whipper-snipper and the other 2 stroke motors I have. I would not subject them to running without an effective lubricant in the fuel.
I do agree with you that vegetable oils can be good lubricants, but only for certain applications. I have heard of canola oil being used as engine lubricant in a diesel engine, the oil was then fed to the IP and the sump made up from the fuel tank. I do not know the current status of this engine and do not recommend this for anyone who wishes to get good life from their engine.
I have, and still use used cooking oil (filtered) as chain lube on my chain saws, with no reduction in service life of the chain or bar. I also do not recommend this, as I have only had about 200 hours of use in this application and still have not reached the stage where I would normally replace the bar.

I do not claim to have a monopoly on intelligence or good ideas.

I do know, when someone is asking about the use of biodiesel instead of 2 stroke oil, that it is vital that they are advised against doing so, for the longevity of their engine, nothing to do with anyone's status or intelligence.

Regards,
Tony