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  1. matthew_mag

    Rule of thumb for E85 compression ratio

    @gruntguru OK, watched that video again, perhaps more awake this time. You're certainly right on some points but let me clarify why I said that it's the wrong inference to make. 1. As a "rule of thumb" if fuel A burns faster than fuel B, MBT will be less for fuel A. Agreed. But if fuel A is...
  2. matthew_mag

    Rule of thumb for E85 compression ratio

    Some interesting and useful thoughts around using E85 - thanks for those. But only Brian has related this to my search for a "rule of thumb". In looking for a CR rule of thumb, I was hoping to get some kind of relationship (theoretical, empirical, vague even) between an original CR for a petrol...
  3. matthew_mag

    Rule of thumb for E85 compression ratio

    To clarify: Otherwise mechanically identical.... So it is mechanically identical except for the CR. i.e. If we have a petrol engine with a particular CR and we wish to convert it to E85, making no other changes than CR (and non-mechanical to ignition and carburation), then, on what basis...
  4. matthew_mag

    Rule of thumb for E85 compression ratio

    Is there a good rule of thumb for compression ratio where we know the original manufacturer's CR for a given petrol engine and wish to know the desired CR for an otherwise mechanically identical engine running on E85? Any thoughts and theoretical basis on this would be appreciated.

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