Plantoil/diesel conversion basics
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hvacr9

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hello,I am new to this forum and currently have a conversion in progress.My vehicle is a 84 vw rabbit.I have been reading this board and gathering materials,making tank etc.I now have many hours and a good chunk of money invested.I read a post that dana answered about vw diesels and coking issues.

How does this happen?
How to check?
What can be done to improve combustion?
Is it worth my time to convert this vehicle?
What are the general running symptoms?

 

danalinscott

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Quote:
My vehicle is a 84 vw rabbit.I have been reading this board and gathering materials,making tank etc.I now have many hours and a good chunk of money invested.I read a post that dana answered about vw diesels and coking issues.


Q: How does this happen?
A: An explanation of this phenomenon is at:  http://www.websitetoolbox.com/tool/post/voconversionbasics/vpost?id=1644578

Q:How to check?
A: Regular compressions testing kept as a log and chart will alert you when piston ring/land/groove coking becomes critical. Hopefully before secondary damage occurs.

Q:What can be done to improve combustion?
A:1. Get VO temps as close to 300°F as possible prior to injection.
2. Never run VO(whether hot or not) in an engine not up to full operating temp.
3. Make sure your VO fuel contains less than 300ppm of suspended water. (It degrades injector performance fairly quickly)
4. Make sure that your injectors are always operating within spec.
5. Make sure that your injection timing is within spec.

Q:Is it worth my time to convert this vehicle?
A: If I sold kits I might be tempted to say yes. But I don't so greed does not pay a factor. To provide and honest answer I would have to know more about how you plan to use the vehicle and your motivation. If your motivation is strictly financial and you plan to use the vehicle for mostly short trips the answer would be probably not. The Return On Investment for converting a very high MPG vehicle is very long term and using it for short trips most likely will mean the investment would probably not pay off.
If your motivations are not strictly financial or your main use will be long trips then the answer might be yes depending on the condition of the engine currently.

Q:What are the general running symptoms?
A: Taking more revolutions to start is one of the most obvious. Unfortunately this happens so gradually it may not be noticed and secondary damage may have already occurred.

 


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hvacr9

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Reply with quote  #3 
It will be used to commute only,120 miles a day to and from work.It has 175,000 on it.When cold out on cold start she stumbles and smokes blue for about 90 seconds.after that full power and restarting is no problem.....thanks for your answers.
I got this car for nothing and it runs out great the body is also in great shape,The way iI figure it is I can get my feet wet with the conversion and upgrade vehicles later...
danalinscott

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The way iI figure it is I can get my feet wet with the conversion and upgrade vehicles later...


A realistic goal.
And a fairly simple conversion to do.
Since you plan to use it for long commutes if you allow the engine to come up to full temp prior to switching to vo you should be able to put off any ring coking issued for quite a long time.



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Dana danalinscott@yahoo.com
hvacr9

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Reply with quote  #5 
Its done!!!! Wow that was alot of work.....

thanks for all the info that I have gathered,I now have the sickness of checking site daily!!!!

I am in plumbing refrigeration and sheet metal business,Built everyhing and gathered fittings,did I say gathered fittings?
about 40 hours went into it,put my first 120 on today not even a hiccup.I need to clean up the wiring a little before I post pics.
danalinscott

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Congratulations!
I am sure that you learned something that was not posted.
It may be helpful to others if you can post that.
It will be even more helpful if you post in a section where it will be easily found later by those hoping to do what you just did.

Let me know if you would like a little help doing that.

Quote:
Originally Posted by hvacr9
Its done!!!! Wow that was alot of work.....

thanks for all the info that I have gathered,I now have the sickness of checking site daily!!!!

I am in plumbing refrigeration and sheet metal business,Built everyhing and gathered fittings,did I say gathered fittings?
about 40 hours went into it,put my first 120 on today not even a hiccup.I need to clean up the wiring a little before I post pics.


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Dana danalinscott@yahoo.com
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