Re: air - fuel ratio

Tegger wrote:
> "HLS" <nospam@[EMAIL PROTECTED]
> wrote in
> news:avKTj.1755$ah4.341@[EMAIL PROTECTED]
 
> 
>> "Tegger" <tegger@[EMAIL PROTECTED]
> wrote in message
>>> That's the answer I was looking for.
>>>
>>> If volume is the determining factor, I'd guess MTBE would have a
>>> similar effect on stoichiometric as ethanol, since it's added in
>>> concentrations up to 15%.
>> I dont think so, Tegger... Methyltertiarybutylether has a different
>> ratio of hydrogen to
>> carbon to oxygen..  It should not have the same stoichiometry as
>> ethanol. 
>>
>> Ethanol is almost 35% oxygen by weight. MTBE is only about 18% oxygen.
>>
>>
> 
> 
> 
> Then MTBE is about twice as efficient as ethanol, so the mixture can be 
> leaner?
> 
> 
Some more fuel blend data.

  ****** MBTE ******
%MBTE    Stoich A/F
0         14.6
5         14.42
10        14.25
15        14.07
20        13.91
100       11.69

****** Methanol ******
%MeOH    Stoich A/F
0         14.6
5         13.73
10        12.96
15        12.27
20        11.65
55        8.61   (most energy per unit mass of air)
100       6.45