2.10
GENERAL
pump, or carburetor. This will cause warm engine drive ability
problems and hard starting when warm. Some states are
limiting the Reid Vapor number to 9.0 PSI year around to help
meet evaporative emissions standards.
2 STROKE GASOLINE / OIL PRE MIX
To figure out the correct fuel to oil ratio per gallon, you will
need to use different formulas for the ratio that you are
looking for. Example of a fuel/oil ratio of 20:1 is figured out
by taking the gallons of the fuel mixing container (1 gallon)
and converting it to ounces (128 oz.) divided by the ratio that
you are looking for (20), this will give you the amount of oil
that you need (6.4 oz.) to add to the fuel in the mixing
container.
1 gallon has 128oz. / 20 = 6.4 oz. of oil needed to mix to each
1 gallon of gasoline. For a 5 gallon mixture, you would need
add 32 oz. of oil to the gasoline.
Table 2-7: Gasoline Volatility
Maximum Reid
Vapor
Ambient Air Temp
Range
CLASS PRESSURE LOW HIGH
A 7.0 psi (0.5 bar)
60_F
(16_C)
110F+
(43_C+)
B 9.0 psi (0.6 bar)
50_F
(10_C)
110F
(43_C)
C 10.5psi (0.7 bar)
40_F
(4_C)
97F (36_C)
D 12.0psi (0.8 bar)
30_F
(-1_C)
85F (29_C)
E 13.5psi (0.9 bar)
20_F
(-7_C)
69F (21_C)
Add 2.45_F for each 1000 ft (305m) above sea level
Table 2-8:
GALLONS OF
FUEL
OZ OF OIL
NEEDED TO
ACHIEVE A
20:1 RATIO
OZ OF OIL
NEEDED TO
ACHIEVE A
32:1 RATIO
164
2138
31912
42616
53220
63824
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