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Old 09-09-2006, 10:48 AM   #126
hippy
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Quote:
Originally Posted by PeteDucati View Post
.... "..how does it not ignite immediately during spray into the throttle body".
Could be partly because positive might(I think it does, but I'm havin a rough morning) increase the temp at which the alc lights. It's also because alcs flashpoint is not the temp at which it ignites without a spark.

peace
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Last edited by hippy; 09-10-2006 at 09:52 AM.
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Old 09-09-2006, 12:39 PM   #127
dibblejr
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My bottle temp stays costant 118 deg F, it sits right under my SPT intake.
I did have a recent developement though, the cheap Autozone tank I bought rupyured and my meth ran out. The tank I had purchased from Autozone had a wire bracket it sit in. I think that with my JIC coilovers that the bouncing help cause the rupture.
For the fix I cut off one side ( mounting bracket) on the heavy duty tank that came with the kit. It is a big difference in the thickness of the plastic in comparrison to the Autozone cheapo. I bolted the other side bracket right to my SPT heat shield. My new temp is exactly the same 118 f.
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Old 09-09-2006, 12:42 PM   #128
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I have tried to answer this question before and everyone got bent out of shape. I will say this today to keep it simple.
The temp of the alky running through the lines may be enough to cause it to ignite, but you have to have an ignition source. ie; you cant make a fire without a spark. When the juice meets the TB it is cooled down by the air, then it is consumed into the combustian chamber, thats why it doesnt ignite in the TB.
Hopefully that explains it even easier than the first time a week ago.

Jay-R

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Originally Posted by hippy View Post
Could be partly because positive might(I think it does, but I'm havin a rough morning) increase the temp at which the alc lights.

peace
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Old 09-09-2006, 01:08 PM   #129
dibblejr
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Yes they all have different FP's and BP's.
Here they are;

Alcohol FP 140F, 60C, BP 78.3C
Methanol FP 51.8F 11C, BP 149F 65C

Here's a helpful chart with mixing fuel and water



Quote:
Originally Posted by PolarisSnT View Post
I run 100% denatured alcohol and I havnt run into this problem yet. I use my washer tank as theh storage tank and my pump is stored in my driver fender. Does the denatured alcohol have different properties as Meth or am I just lucky?
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Old 09-10-2006, 09:02 AM   #130
hippy
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Originally Posted by dibblejr View Post
I have tried to answer this question before and everyone got bent out of shape. I will say this today to keep it simple.
The temp of the alky running through the lines may be enough to cause it to ignite, but you have to have an ignition source. ie; you cant make a fire without a spark. When the juice meets the TB it is cooled down by the air, then it is consumed into the combustian chamber, thats why it doesnt ignite in the TB.
Hopefully that explains it even easier than the first time a week ago.

Jay-R
You can make fire without a spark. That's exactly how diesel engines work and how knock, pre-ignition, and afterfire occur(as far as I know). You do need oxygen for fire, but alc has that build in. Not saying that alc is igniting on the way into the engine, because it would need to get MUCH hotter then its flashpoint temp for this to occur without a spark.

As far as I know, the autoignition temp(temp at which it will ignite without a spark) is higher then 700F. This would mean that the chances of it igniting inside the intake track(like at the throttle body) are most likely pretty close to nil, but it could easily happen if the alc was being injected into the engine compartment(because of things like a hot turbo and exhaust parts).

peace

Last edited by hippy; 09-10-2006 at 10:00 AM.
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Old 09-10-2006, 11:26 AM   #131
dibblejr
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Diesel engines do have an igniter, it's called the " glow plug". We are not talking diesel engines here, that is a totally different operating platform.
If your alky/meth is hot enough to burn on it's way into the engine then your entire car will be on fire because the plastic tanks would melt. I include a copy of some of the Plastics properties for review.



jay-r



Quote:
Originally Posted by hippy View Post
You can make fire without a spark. That's exactly how diesel engines work and how knock, pre-ignition, and afterfire occur(as far as I know). You do need oxygen for fire, but alc has that build in. Not saying that alc is igniting on the way into the engine, because it would need to get MUCH hotter then its flashpoint temp for this to occur without a spark.

As far as I know, the autoignition temp(temp at which it will ignite without a spark) is higher then 700F. This would mean that the chances of it igniting inside the intake track(like at the throttle body) are most likely pretty close to nil, but it could easily happen if the alc was being injected into the engine compartment(because of things like a hot turbo and exhaust parts).

peace
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Old 09-14-2006, 05:15 AM   #132
PeteDucati
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Quote:
Originally Posted by hippy View Post
As far as I know, the autoignition temp(temp at which it will ignite without a spark) is higher then 700F.
It's some where in the mid 800's.. gasoline is a couple hundred degrees less.

Diesels only use glow plugs for cold starts - and that's only on very light duty diesels, tractor trailers don't have glow plugs.

The 147 degree boiling point of methanol has nothing to do with it's ignition point. And the air/fuel ratio also plays a huge role determining this, too.
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