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Old 11-12-2011, 03:40 PM   #11 (permalink)
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ik some of this is old tech. the only way to figure out how to move forward is to see what went wrong in the past. ur right about it condensing as it gets cooler. just playing around with ideas and others' concepts before i go blowin up my daily driver. another idea is to use a coil/converter to heat the fuel to 350 or so *F and bench test at what pressures it will vaporize. any insight would be welcome to avoid brick walls. flaming without proof will be ignored.

the propane thing is because the price of lpg around here is less than $2.50/gallon while gasoline is over $3.50. even with the lowered btu/hr the cost savings justify it for me. also with bio-propane being captured from bio-mass production, bio-propane and DME will soon be sustainable fuels.

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Old 11-12-2011, 04:30 PM   #12 (permalink)
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sounds like the OP is just looking to use the waste vapors from the tank. fortunately, it's already been done, quite a few years back.

it is the charcoal canister under the hood. the vapors are absorbed by the charcoal and then released into the intake under vacuum when the engine is running.
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Old 11-12-2011, 04:32 PM   #13 (permalink)
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Quote:
Originally Posted by villain.ind View Post
im currently trying to make my hour drive to school a bit less fuel consuming.
move closer.
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Old 11-12-2011, 04:38 PM   #14 (permalink)
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You're a what?

Thanks for making me laugh, Frank. I needed it.
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Old 11-12-2011, 05:40 PM   #15 (permalink)
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so you want to add a geet reactor to your car?
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Old 11-12-2011, 08:09 PM   #16 (permalink)
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Quote:
Originally Posted by pete c View Post
move closer.
"thanked," that solves my problem completely!

the problem with plumbing the vapor directly into the engine is that it is isnt metered. the engine would run rich. unless it isnt enough to make a difference, in which would make this mod useless.
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Old 11-12-2011, 11:13 PM   #17 (permalink)
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isnt this just an evaporative emissions system were talkin about here???
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Old 11-13-2011, 10:03 AM   #18 (permalink)
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Quote:
the only way to figure out how to move forward is to see what went wrong in the past.
Well that's what they did. They looked at what was wrong with the wick-type evaporative carburetor and came up with the pitot tube and nozzle-type. Then they looked at what was wrong with that and came up with TBI, then thay looked at that and came up with PI, and after yet another round they went with DI.

Now you come here and you want to ignore all that looking at what was wrong and go back to the stone age? And you've already started to add a bunch of epicycles in the form of heating and cooling to make it work.

I say instead look ahead, and put the injectors right back there at the very end of the tail pipe! /jk

No, but maybe look at what you can do to make DI doable for the home tinkerer.
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Old 11-13-2011, 10:32 AM   #19 (permalink)
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Since you already have the evaporative emissions purge circuit, the question becomes, what would happen if you introduced another fuel supply through the purge hose connection to the manifold?

The fuel management system would reduce the gasoline supply through the injectors to compensate for the additional fuel supplied through the supply circuit you have created.

Ultimately the oxygen sensor would trim the total fuel supplied to maintain stoichiometric mixture.

I see it as a possible way to use an alternative fuel supply for lower overall cost per mile.

Questions would still remain concerning the location, plumbing, and safety in a collision, when adding something like a propane bottle to your vehicle. I don't think it would be easy to make it cover all operating ranges of your engine, but when cruising at sustained higher speeds, adding a metered amount of propane or another fuel might be a viable option to just gasoline delivery.

As far as a home brewed Direct Injection system, that's a serious stretch, since most DI systems have engines using higher compression to utilize the advantages of DI as far as the direct cooling of the combustion chamber by the fuel injected directly into the combustion chamber itself.

Compressed Natural Gas might be another pathway, but then you have the issue of the CNG fuel containment vessel and the additional cost.

Better vaporization of the propane could be accomplished by using some cooling system heat to preheat the propane, on it's way to the induction point.

Sure would be nice if the same effort at slamming an idea would be directed more constructively.

regards
Mech
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Old 11-13-2011, 10:39 AM   #20 (permalink)
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Quote:
Originally Posted by villain.ind View Post
another idea is to use a coil/converter to heat the fuel to 350 or so *F and bench test at what pressures it will vaporize.
Please don't. See Boiling liquid expanding vapor explosion - Wikipedia, the free encyclopedia

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