Re: E85 Ethanol in a Ford 8N?

Posted by Gerald J. on November 29, 2006 at 11:19:39 from (67.0.102.135):

In Reply to: E85 Ethanol in a Ford 8N? posted by David in Ohio on November 29, 2006 at 04:30:01:

Since Ford's model T and model A engines were made to be adjusted to run on ethanol from their early times, and the 9N engine is about half a flat head V-8 and that V-8 was based on the model A engine but with some poor choices for distributor location, the fuel system of the 9N will probably handle E-85 just fine. Unlike the computer run fuel injected modern engines, it won't switch automatically. So you have to manually tune for it and it takes something like 43% greater volume.

E-85 is about 105 octane so to really make great use of it you can run the compression ratio way up or can run it lean. I don't think you can run it lean enough to make up for all of that 43%. One way to raise the effecive compression ratio is to put on a supercharger. That's more complication than a 9N is worth, in my opinion.

The remaining 15% is supposed to be gasoline, and that magic ratio is supposed to make E-85 start reasonably well in the winter. Less gasoline than that makes for significantly harder cold weather starting. Gasoline at a 5% rate is one of the long used standard denaturants for ethanol. Just makes it hard on the drinker.

Gerald J.

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