Plantoil/diesel conversion basics
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danalinscott

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 Configuration Key/Legends


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danalinscott

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One of the most basic conversion configurations.


In this configuration the only components used are essentially a heated fuel line and a six port remote fuel valve in addition to a VO tank. Since the tank is unheated and there is very little heat added to the VO as it travels to the injectors this configuration will only work at all in climates that allow the VO used to remain very liquid at all times. The disadvantages of this configuration include the fact that during purges the VO in the IP and filter are sent to the diesel tank. This has the effect of turning the purge fuel into a "blend" which is undesirable due to the ring land coking danger blends present when used for cold starts. I do not recommend this configuration except in the case of "quick and dirty" conversions of engines not expected to last more than 20-40K miles.


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A slightly more complex configuration which replaces the single 6 port remote fuel valve with two 3 port remote fuel valves.


In this configuration the only components used are essentially a heated fuel line and two three port remote fuel valve in addition to a VO tank. Since the tank is unheated and there is very little heat added to the VO as it travels to the injectors this configuration will only work at all in climates that allow the VO used to remain very liquid at all times. This allows a separation of the VO feed and return circuits and so allows the fuel in the filter and IP to be looped until it is nearly VO free during purges. This is an improvement over the first example..but results in very long purge times due to the amount of VO in the single shared filter.  I do not recommend this configuration except in the case of conversions of engines only used for long distance travel due to the extremely long purge times.

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Another yet more complex configuration showing the first example of a "looped VO return" and a simple "tube in tube" coolant/fuel heat exchanger.

A "looped" return is one that directs fuel that has already been through the IP and injectors back to the IP (often via the filter) rather than to the tank. This has the desirable effect of not "wasting" the energy used to heat the VO fuel to the desired pre-IP temperature and keeping the temperature of the VO in the tank from reaching a point where polymerization may be sped up to an undesirable rate.

It also has the undesirable effect of allowing any bubbles of air that may be entrained in the VO fuel to accumulate to the point of causing fuel starvation. AND of course this single filter configuration also has the undesirable trait of any conversion that uses a single "shared" filter for both diesel and VO. If the filter clogs due to too thick or cold VO the engine starves for fuel.

The option of switching to a filter with no VO in it is considered a "must have" for most modern VO conversions. Skip ahead to example #11 for the first example of a two (dedicated) filter conversion configuration.



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Reply with quote  #5 
This is essentially a version of the previous configuration that uses two 3 port valves to allow less VO to be sent to the diesel tank during purges.

 

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In this configuration a filter heater (coolant) wrap is used to add a bit more heat to the VO before it arrives at the IP. The filter wrap also allows the filter to heat up enough so higher melt point VO can be used  sine it will liquefy the VO in the filter similar to the way the HOH heated fuel line will liquefy thick wvo in the VO lines.



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Reply with quote  #7 
This is essentially a version of the previous configuration that uses two 3 port valves to allow less VO to be sent to the diesel tank during purges.



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Reply with quote  #8 
A configuration similar to #5 where 12v heat is used to add more heat to the VO before it reaches the filter.





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Reply with quote  #9 
Just a version of #7 which is capable of not dumping VO into the diesel tank during purges.





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A configuration very similar to # 7 but using a 12v heated filter.





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Reply with quote  #11 
A configuration very similar to #8 but using a 12v heated filter.





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Reply with quote  #12 
The first example of a configuration where each fuel has its own filter. Referred to as a "dedicated filter" conversion it provides the option of switching to diesel if any problem occurrs with the vo "side" of the conversion.  Dedicated filters are a "must have" option IMO for any practical VO conversion.





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Reply with quote  #13 

This is essentially a version of example #5 with the addition of a coolant heated fuel pickup. This allows Vo that is solid or "pudding like" to be quickly liquified so it can pass thorugh the VO fuel lines very soon after the coolant is warm. Coolant heated fuel pick ups are much more efficient than "whole tank" heaters.





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Reply with quote  #14 
This is essentially a version of example #6 with the addition of a coolant heated fuel pickup.





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Reply with quote  #15 

This is essentially a version of # 11 with a coolant heated fuel pickup.






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