This website uses cookies to improve navigation. No personal data is held. Do you agree to the use of these cookies?    
Classic Engines, Modern Fuel

Comments on Topic: The Good, the Bad and the Ugly of E10

Submitted by The Author

See the article published on this website:

Submitted by The Author

In answer to your question. Alcohol and Ethanol are the same stuff. There are two differences between Cleveland Discol and E10.

Firstly the physical characteristics of ALL brands and grades of modern petrol are different from classic petrol. There is a whole chapter of the book that describes these differences. These are the cause of what many people refer to as the "hot restart problem". 

Secondly, although Discol contained ethanol, nobody I have spoke to knows at what concentration. It was probably less that 5% so that vehicles could use Discol and "normal" petrol without the need to be retuned. 

However, as you say, Discol did not appear to cause catastrophic failures in the 60's and 70's. 


Submitted by Anonymous


Ethanol is an anti-knock additive. Removing it from the petrol reduces its RON and may make engines susceptible to pinking or knocking

1 ]     Given the content of your reply are you able to explain how and /or why Ethanol free petrol is freely available in the USA [see Attachment] and how / why the FBHVC openly advertise in their quarterly Newsletter that SUNOCO will / can supply Ethanol free fuel?

2  ]   The International Union of Pure and Applied Chemistry (IUPAC) seems to have brought Ethanol to the fore by re-naming Ethyl Alcohol . Is that so Ethanol is not confused with Tetra Ethyl Lead which is a component of the now defunct leaded fuel?

3 ]    If Ethanol is the same as Ethyl Alcohol, was there ever any evidence that Ethyl Alcohol damaged components in the way that Ethanol does?


Submitted by The Author
  1. There are a number of additives that improve a petrol's knock resistance (i.e. increase its octane rating). The one we are most familiar with is the now obsolete Tetra Ethyl Lead. Ethanol also improves a petrol's knock resistance. Where fuel does not contain ethanol other chemicals are added. These include methyl tertiary-butyl ether (MTBE) and ferrocene. When a fuel contains ethanol this REPLACES the other anti-knock additives (although they still may be present at a lower concentration). Hence removing ethanol will reduce the octane rating of the fuel.
  2. One big advantage of using SUNOCO is that not only is it ethanol free, its volatility curve matches that of 1960's fuel. It addresses the Hot Restart Problem and does not "go off" like modern fuel. In addition classic engines run well on this fuel.
  3. Ethyl alchohol and Ethanol are the same substance (just a different name). Clevand Discol was introduced in 1928 and sold until 1968 this petrol contained ethanol and there is no evidence it caused damage to what are today's classic cars. However, it is not known what concentration of ethanol Discol contained.
Please wait .....