Tuesday, 25 September 2012

Typical 1940’s racing fuel components


The following technical information is dated 16th May 1946 and is provided in Jimmie Simpson's  little black book.

Components
Specific gravity @ 60°F
Boiling Range
Chemically correct mixture air /fuel by weight
Latent Heat, B.Th.U.S/Lb
Latent heat per pound of air in a chemically correct mixture (see note 2) B.Th.U.S
Lower calorific value B.Th.U.S/Gall
Petrol (aviation) base stock
0.720
50-150°C (50% below 100°C)
15.0:1
145
9.7
138.000
Benzole (high quality)
0.878
78-120°C (90% below 100°C)
13.4:1
165
12.3
152.000
Methyl alcohol (Methanol)
0.797
65°C
6.5:1
437
73
68.000
Ethyl alcohol (Ethanol)
0.794
78°C
9.1:1
368
41
92.000
Acetone
0.798
56°C
9.5:1
239
25
98.500
Ether
0.714
34.5°C
11.2:1
150
13.4
107.000
Water
1.000
100°C
-
972
-
Nil

 
Petrol (aviation base stock) - Petrols vary widely in boiling range and anti-knock value. Octane number if typical aviation stock is about 75.

Benzole (high quality) – Benzoles subject to variation. Anti-knock value indeterminate (see note 3)

Methyl Alcohol (Methanol) - Anti-knock value indeterminate (see note 3)

Ethyl Alcohol (Ethanol) - Anti-knock value indeterminate (see note 3)

Acetone – Anti-knock value about 100 Octane

Ether – Very poor anti-knock value. Can only be used sparingly. Used to improve volatility.

Water – Used with alcohol fuels to increase the latent heat still further

 
 Notes:

1)      The question of solubility of one component in another is rarely an involved one. Although it requires careful consideration it is not normally a serious difficulty

2)      In tables such as this, it is usual to give the latent heat of the fuel alone. However, it is considered that the latent heat per lb of air in a “correct” mixture is more significant in practice

3)      The anti-knock values of benzole, methanol and ethanol are normally quoted as being 90-100 Octane. In most racing motor-cycle and car engines, however, the effective anti-knock values of these fuels are very much higher indeed.

3 comments:

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  2. Yorkshire Ferret: Where are you?? Nothing serious, I hope!

    Jim A., Tucson, AZ (USA)

    ReplyDelete
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