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Have been having an issue with fuel boiling in the carburetor with heat soak after shut down. 1940 Chrysler Windsor.

I removed lower pans from either side of the motor to improve air flow, and installed a heat shield between manifolds and carburetor.

 

So far, so good

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19 hours ago, _shel_ny said:

Lower it. That spec is for 1940 fuel formulation.

What specification has changed to require a lower volume of fuel in the float bowl?

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26 minutes ago, jeffsunzeri said:

What specification has changed to require a lower volume of fuel in the float bowl?

the entire makeup and formulation of gasoline along with the cutting with varying amounts of alcohol.....some very interesting reading on the internet explaining this and the winter/summer blends we go through annually.......

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31 minutes ago, jeffsunzeri said:

What specification has changed to require a lower volume of fuel in the float bowl?

 

Corn oil.

Table 2.1: Gasoline and Ethanol

 

Gasoline

Ethanol

Flash Point

-45°F

55°F

Ignition Temperature

530–853°F

793°F

Specific Gravity

0.72–0.76

0.79

Vapor Density

3–4

1.49

Vapor Pressure

38–300 mmHg

44 mmHg

Boiling Point

100–400°F

173°F

Flammable Range (LEL–UEL)

1.4%–7.6%

3.3%–19%

Conductivity

None

Yes

Smoke Character

Black

Slight to none

Toxicity

 

Lower than gasoline

Solubility

None

Highly

Reference: The National Institute for Occupational Safety and Health (NIOSH) Pocket Guide to Chemical Hazards

 

 

 

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Simply put 50's gas went bang in an internal combustion cylinder, today's goes whoomph.  It evaporates more quickly, absorbs more heat quicker, boils at a lower temp, produces fewer BTUs. Has a slower flame front, And changes formulas twice a year at least in the northern part of the country. 

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