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posted September 04, 2001 10:46 AM UIN: 16262997

WE now come to the last use of additives and that is to assist with starting, which should not be a problem but nevertheless sometimes is. Again we deal with our three basic fuels as before.


Acetone is the only safe additive to use, its function being that it increases the volatility of the mixture, without reducing the basic fuel properties too much. Up to 5 percent being quite enough to use.

Ether is the only other additive to use with Petrol and may be used in the same manner as Acetone and for the same reason, but is in fact not recommended for use with spark ignition systems, and has obvious handling problems.

It can also quite easily produce a wrecked engine, so use it if you must, but you have been warned


Acetone is the only additive and up to 10 percent maximum. The action of this is to increase the volatility of the total fuel or put another way it reduces the flash point temperature.

Main use is on very cold days, but in fact it even then should not be really necessary, however let us say it is convenient.


When our main fuel is Nitromethane, the only additive is again Acetone for the same reasons as when used with Methanol.

All fuels have one common blending agent, this being Acetone, but in most cases will mix satisfactorily without, but where found necessary, the amount used should be the minimum required to obtain complete mixing without trace of separation, visually checked.

In some cases it may be necessary to use quite high percentages, for example some 30 percent when blending Benzole and Methanol.

Over recent years the methods used in producing petrol have changed and with the modern petrol's better blending is obtained with Methanol due to the refining techniques now used without a blending agent being used.


Many think that fuels when stored become less effective with age, but in fact this is not so provided the cans or containers are fitted with caps or snap on lids that fit correctly.

Two fuels that are difficult to keep unless great care is taken in sealing the containers are Ether and Propylene Oxide, the high rate of evaporation being the problem.

In conclusion, may we just repeat three major things to keep in mind.

First of all apart from Petrol, always tend to keep the mixture on the rich side and never on the weak.

In all cases never rush, take your time and be quite accurate in your measurements.

Last of all do not experiment unless you know what you are doing as it could be both expensive and dangerous.

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