Ethanol in a flat head engine?

Asked by Sep 16, 2017 at 01:49 PM

Question type: Maintenance & Repair

3 Answers

20,945

E-85? Main thing I believe is the lead additive for the seals unless it has been updated.

83,295

Ethanol is primarily a problem for fuel system seals. If I were going to run ethanol in a flathead I would up the compression ratio.

54,585

You are most likely asking if E-10 or E-15 is in today's pump gas with a small amount of ethanol is compatible with your flat-head engine. The big issue will be the absence of lead in the fuel. This will be hard on the valves and seats. Either get them upgraded or run a lead substitute in your fuel.

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