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Hey V.
I'm from Brazil. My GL is a sole alcohol burner (we have what is called hidrated alcohol, has a bit of water in it). From what I understand E85 has 15% of gasoline, which should make it pretty good to use it. What I know is for our kind of alcohol, I guess your is a tad less forgiving (because of the little sip of gas in it).
Just for refference, i have a 1914, dual 44, W110 cam, 40X35 heads...bla,bla,bla
Compression is the first difference. My car runs 13:1. If the engine was stock (given the bugs old design) this should be 10,5:1 (modern engines run 12,5). I'm doing a few changes in my engine now (bigger cam) and along with that will go with 14:1. So you get the picture.
Then you need more fuel, consumption is much higher. Carburator needles have to be bigger (my dual Weber 44 use 250 needles) and an electric fuel pump. Idles are 85, mains are 200 and airs are 210. The Etubes have to be richer too. I use F3s.
Timming is different too. I start with 16 and advance it to 32.
Alcohol has less energy in it, so it is ****ty if you don't have the compression bump, there are no advantages. It is awesome for turbo. To give you an idea there are guys running completely stock 1600 (with a gasoline CR) and nasty turbo systems. I know of a specif one that makes 326fwhp on a bone stock motor running 30psi, that without an intercooler. (it is a modern Kombi engine, the ones which stopped production a few months ago).
So, if you build an E85 engine, that's cool, if you convert (carbs only, without CR), there is nothing to gain. If you go turbocharged, then you guys will start understanding what turbos can really do. And all of a sudden a 326 stock 1600 won't sound so crazy....
Best regards,
Marcelo
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