Hi Captain Echidna,

From what I have been reading the Air / Fuel ration of;

Gasoline is about 13.4 to 15 to 1, ideal range about 14.5 to 1
Ethanol is about 23 to 9 to 1, ideal range about 9 to 1

I have leant my book to a friend so can quote exact at the moment.

So in the car the ECU can make adjustments on the fly. In Brazil they run 25% ethanol in all petrol sold. Any fuel injected cars can run up to 25% no problems.
As you raise the amount of ethanol two things can happen.

1)From what I have read as there is less emission the o2 sensor so the ECU increase fuel use thinking the car is running lean reducing economy.
2)The engine check light will come on.

The solution is a $300 dollar Flex Converter & David Blue from Alcohol Can Be A Gas talks about a Oxygen sensor modifier. Also the best way is an add on chip like Uni Chip with proper tuning.

So what I am doing is watching my fuel economy and seeing how high I can go with out conversion. At 10% I get better fuel economy.

My main concern is with the generator as I am expose to the pollution it produces regularly also looking to reduce the pollution the chainsaw makes.

And with the generator have to run with some choke but the exhaust gas and engine temperature are a lot cooler.

I’m a computer geek so just running with some choke solves my problems. In the Book has a whole chapter on carbie modification.

Later on I plan to make my own dual fuel car running on natural gas or 100 alcohol with compression ratio of 12.5 to 1. With compressed air instead of using a turbo or super charger.

But have to make methane first.

By the way I have a friend that runs a carbie lean and use ethanol with water injection to reduces the temp with good results, He’s got my book.

Regards,

Chris.