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IWETHEY Home / IWETHEY Board / Regional/World Conflict Forum / ~14.5:1 air / fuel ratio for gasoline, semicolon...
Post #47,513
by jb4
Picture of jb4
7/30/02 4:30:54 PM
Reply
New ~14.5:1 air / fuel ratio for gasoline, semicolon...
...at what compression?

In the 70's, we had a doohikus that would inject some small amount of water vapor into the mixture. Supposed to increase compression. Increased mileage about 10-15% if memory serves.
jb4
"I remember Harry S. Truman's sign on his desk. 'The buck stops here.' Strange how those words, while still true, mean something completely different today." -- Brandioch
Post #47,548
by Another Scott
7/30/02 11:45:07 PM
Reply
New Are you serious? :-)
The [link|http://www.straightdope.com/classics/a3_150.html|Pogue carburetor] and water injectors and the like aren't magic. The Pogue carburator was a fraud.

It's easy to get 30+ MPG out of a 330 HP 428 CID Mustang Mach I. It's easy to get 40+ MPG out of a Ford Expedition. You simply have to restrict the fuel available to the engine and you have to accelerate very slowly. E.g. in the Mach I the owner wired the secondaries of the 4 barrel carburator shut and soldered up the jets in the primary circuit then drilled it out with a smaller orifice. It ran like a turtle, but got much better mileage. It also blew a head gasket shortly thereafter (probably due to detonation).

The best air/fuel ratio is set by the chemistry of gasoline combustion. It has nothing to do with the compression ratio. Emissions are lowest and efficiency is highest at [link|http://www.forparts.com/emission.htm|14.7 to 1] (by mass). Power in a gasoline engine is limited by the amount of oxygen in the cylinders, so for more power lower ratios (e.g. 12.5 to 1) are used to make sure all of the oxygen is used.

Water injectors work in engines that suffer from premature buring of the fuel (pinging, detonation, etc.). It cools the input charge and makes the fuel more likely to be ignited at the proper time by the spark plug. It doesn't increase the compression (increasing compression make premature buring more likely). Water injection isn't terribly effective in engines that don't suffer from pinging. And water injection introduces various corrosion issues, possibly increased emissions, worries about oil dillution and increased wear, etc., etc.

TANSTAAFL.

My $0.02.

Cheers,
Scott.
     Time article about Saudi Arabia - (SpiceWare) - (26) - July 29, 2002, 11:20:02 AM EDT
         Even prior to 9/11, have occasionally wondered if - (Ashton) - July 29, 2002, 05:25:27 PM EDT
         Re: 'If we sort out Iraq ' - (dmarker2) - (5) - July 29, 2002, 08:54:45 PM EDT
             Now Doug..__ we don't want it for ourselves! - (Ashton) - (3) - July 29, 2002, 09:16:32 PM EDT
                 Re: Yup, I forgot - silly me - its the New World Order .. - (dmarker2) - (2) - July 29, 2002, 11:26:25 PM EDT
                     Interesting Idea. - (altmann) - (1) - July 29, 2002, 11:51:38 PM EDT
                         "The Warfare State" - - (Ashton) - July 30, 2002, 01:10:49 AM EDT
             just because some arabs breed on top of it - (boxley) - July 30, 2002, 10:45:45 AM EDT
         Yeah, and Pigs will fly on alternate Tuesdays... - (jb4) - (18) - July 30, 2002, 10:32:38 AM EDT
             Re: Hmmm - 1/2 pig already flying then :-) - (dmarker2) - (17) - July 30, 2002, 10:49:12 AM EDT
                 If cars go hydrogen... - (admin) - (2) - July 30, 2002, 11:09:14 AM EDT
                     Re: If cars go hydrogen... - (wharris2) - (1) - July 30, 2002, 11:22:34 AM EDT
                         Re: Fuel Cell Vehicles - recent links & activity - (dmarker2) - July 31, 2002, 01:31:13 AM EDT
                 Fortunately, oil can be manufactured - (Andrew Grygus) - July 30, 2002, 11:46:39 AM EDT
                 We've also got proven 100mpg carbs, too. - (jb4) - (12) - July 30, 2002, 01:34:52 PM EDT
                     Right. - (wharris2) - July 30, 2002, 02:15:53 PM EDT
                     ~14.5:1 air / fuel ratio for gasoline. Period. - (Ashton) - (10) - July 30, 2002, 03:03:33 PM EDT
                         Well...we've had several cars - (Simon_Jester) - (7) - July 30, 2002, 04:06:49 PM EDT
                             Steam works also - (boxley) - (6) - July 30, 2002, 04:39:01 PM EDT
                                 Well, if you want to go external combustion... - (Simon_Jester) - (4) - July 30, 2002, 06:38:33 PM EDT
                                     Re: Stirling Engines - Still on the boil (links) - (dmarker2) - (3) - July 31, 2002, 02:17:06 AM EDT
                                         Damn, I was LOOKING for that link! - (Simon_Jester) - July 31, 2002, 02:08:10 PM EDT
                                         Since this topic came up in another thread... - (ben_tilly) - (1) - July 31, 2002, 10:30:19 PM EDT
                                             Boffo sig________fer a Perlmonk_________Aauuuummmmm -NT - (Ashton) - Aug. 1, 2002, 02:46:46 AM EDT
                                 Steam is unusable . . - (Andrew Grygus) - July 30, 2002, 06:56:22 PM EDT
                         ~14.5:1 air / fuel ratio for gasoline, semicolon... - (jb4) - (1) - July 30, 2002, 04:30:54 PM EDT
                             Are you serious? :-) - (Another Scott) - July 30, 2002, 11:45:07 PM EDT

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