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Replacement fuel/diesel design
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Posted by: proace

06/04/2004, 18:00:21

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I hope someone can help me with a small problem of sorts.  My hobby is small IC engines and I especially like the diesels (.049-.060 CI).  I hope to build a small one for my collection of my own design as soon as I can get all the information collected, and here is part of the puzzle.  The problem is that the fuel used in these models is a mixture of approximately 33% kerosene, 33% castor oil, 33% ether with about 1% amyl.  Now, I am not sure of the term used when this mixture starts to burn when compressed to the propper pressure for ignition but would like to know.  Also, the ether is the primary igniter I would think because of its lower flash point?

Anyway here are the questions I have and hope someone can help me out. 

1.  What would be a good off the shelf/over the counter replacement for ether? Ether is becoming more and more difficult to obtain by the average consumer.

2.  Would it be possible to build a small diesel (.049-.060 CI) that could run reliably on auto/truck diesel or just kerosene with a small percent of castor for lubrication and cooling?

I hope someone can help me out here as the information would be greatly appreciated.  I tried to keep this as simple as I could since one question can spawn quite a few more.  Also this a great site.

Thanks again,

Ace

 

  







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Re: Replacement fuel/diesel design
Re: Replacement fuel/diesel design -- proace Post Reply Top of thread Forum
Posted by: bruce38100

06/07/2004, 03:46:57

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For the first question you could try methanol instead of ether in the same proportion. In small IC engines (glow plug compression ignition) I use methanol and castor oil only. Kerosene is not recommended as it is an abrasive fuel. Aviation paraffin is more refined and may do the trick but I would not use it.
For question two you cannot use diesel for these small IC engines. Diesel has a flash point of around 200+ degrees temperature for ignition, therefore most diesel engines have a compression ratio of 18/1 up to 22/1 at 18/1 the pressure in the cylinder is about 480psi






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Re: Replacement fuel/diesel design
Re: Re: Replacement fuel/diesel design -- bruce38100 Post Reply Top of thread Forum
Posted by: proace

06/16/2004, 21:13:08

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Thanks for the reply and the good info. Is there a standard formula for calculating the pressure in the cylinder at TDC.
Thanks,
Ace






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