A/F for Alcohol
02-04-2010, 04:14 PM
#6
It depends greatly on what type & concentration of alcohol, but here is a list of the stoichiometric air-fuel ratio's for different fuels to give you something to look at now. Typically the ratio will be between 7.1 to 9.1 for alcohol. Also pre-ignition can be problem unless the mixture is kept well on the rich side. The reason for this is that if the mixture is on the weak side it burns slowly and can still be so doing when the exhaust valve has opened which then becomes overheated. This in turn ignites the next charge before the correct time, the whole process becoming a chain reaction causing even more rise in temperature and so it goes on until the piston holes and other damage then follows.
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Butyl Alcohol: 11.2
Ethanol: 9
Methanol: 6.4
Hydrogen: 34
Hexa-Decane: 15
Diesel: 14,6
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Butyl Alcohol: 11.2
Ethanol: 9
Methanol: 6.4
Hydrogen: 34
Hexa-Decane: 15
Diesel: 14,6
02-04-2010, 04:17 PM
#7
It depends greatly on what type & concentration of alcohol, but here is a list of the stoichiometric air-fuel ratio's for different fuels to give you something to look at now. Typically the ratio will be between 7.1 to 9.1 for alcohol. Also pre-ignition can be problem unless the mixture is kept well on the rich side. The reason for this is that if the mixture is on the weak side it burns slowly and can still be so doing when the exhaust valve has opened which then becomes overheated. This in turn ignites the next charge before the correct time, the whole process becoming a chain reaction causing even more rise in temperature and so it goes on until the piston holes and other damage then follows.
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Butyl Alcohol: 11.2
Ethanol: 9
Methanol: 6.4
Hydrogen: 34
Hexa-Decane: 15
Diesel: 14,6
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Butyl Alcohol: 11.2
Ethanol: 9
Methanol: 6.4
Hydrogen: 34
Hexa-Decane: 15
Diesel: 14,6
Trending Topics
02-04-2010, 04:26 PM
#8
TECH Senior Member
Thread Starter
iTrader: (45)
Join Date: Jun 2005
Location: Hennessey, Oklahoma
Posts: 9,439
Likes: 0
Received 11 Likes
on
5 Posts
lol better than yours..
yea i know what stoich for methanol is.. like for gas it 14.7 and we like to run 12.8 wot, when i go to strap this on the dyno what do I want to run wot?
It depends greatly on what type & concentration of alcohol, but here is a list of the stoichiometric air-fuel ratio's for different fuels to give you something to look at now. Typically the ratio will be between 7.1 to 9.1 for alcohol. Also pre-ignition can be problem unless the mixture is kept well on the rich side. The reason for this is that if the mixture is on the weak side it burns slowly and can still be so doing when the exhaust valve has opened which then becomes overheated. This in turn ignites the next charge before the correct time, the whole process becoming a chain reaction causing even more rise in temperature and so it goes on until the piston holes and other damage then follows.
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Butyl Alcohol: 11.2
Ethanol: 9
Methanol: 6.4
Hydrogen: 34
Hexa-Decane: 15
Diesel: 14,6
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Butyl Alcohol: 11.2
Ethanol: 9
Methanol: 6.4
Hydrogen: 34
Hexa-Decane: 15
Diesel: 14,6