Author Topic: Water/alcohol injection system. Give me your opinion. (Read 12499 times)

HarryMann · « **Reply #15 on:** August 31, 2007, 06:38:43 am »

Quote from: "Hill'n'folk"

this is my "jet",,a pitot tube from an airplane

Splitting hairs maybe, but unless 'twas you that brazed over the end and put the point on it, that's a static tube, with holes in the sides

Could equally have been a combined pitot-static tube. Pitot tubes have a hole in the front, to measure Q, dynamic head. Static pressure is taken from the side holes and the two differenced in the ASI...

Always wanted one of them, should have grabbed one when I could...

Anyway, how much methanol d you reckon is in that Blue stuff? 'cos I can't get much of an effect at all with straight water sprayed into the inlet pre-compressor...

Any idea how much you're injecting per minute? 60~150 ml/min seems to be the given figures for small diesels, 250ml/min overkill maybe.

You seem to be getting a very good effect, though can't see how it increases boost pressure itself...

HarryMann · « **Reply #16 on:** August 31, 2007, 06:39:50 am »

Dupe post

gnavs · « **Reply #17 on:** August 31, 2007, 09:16:27 am »

i think alot of the blue washer fluid is pretty near 50/50 mix of methanol and water.
smells good too

HarryMann · « **Reply #18 on:** August 31, 2007, 11:16:58 am »

Wouldn't that make it pretty toxic?

Not that I'm intending drinking it :roll:
...but neat methanol itself is dangerous even on the skin.

gilligan5000 · « **Reply #19 on:** September 02, 2007, 08:34:24 am »

Methanol MSDS

Sierra94 · « **Reply #20 on:** September 09, 2007, 11:47:11 am »

Pic of tank in place:

Some pics of the intake and pump:

AudiVWguy · « **Reply #21 on:** September 09, 2007, 05:33:04 pm »

One thing to consider about methanol, it has 127 octane. Opposite of what diesel is (cetane). You may want to choose just distilled water or water and a little alcohol for the winter. For gas cars straight meth is best.

HarryMann · « **Reply #22 on:** October 07, 2007, 04:38:00 am »

I've heard that methanol has a slight advancing effect, which nicely counteracts any igntion retardation from water injection...

90/10 water/methanol was quoted as sufficient

Sierra94 · « **Reply #23 on:** October 07, 2007, 06:39:34 am »

Here in sweden the washer fluid is ethanol which I´ve also tested. But I had better results with methanol.

Black Smokin' Diesel · « **Reply #24 on:** October 07, 2007, 06:52:39 pm »

I would use distilled water in summer and washer fluid in winter, both are 2$ a gallon here.

I don't know how the system is activated but here's how I'd set it up: I'd use the WOT switch on the injection pump to activate the water injection but I'd have a switch inside the car to turn off the whole system when I don't want to use it.

Sierra94 · « **Reply #25 on:** October 07, 2007, 07:35:18 pm »

My system uses a adjustable pressure switch mounted on the intake manifold. I´ve also mounted a switch in the container so the pumps shuts off and a light goes on when the fluid is out.

jtanguay · « **Reply #26 on:** October 07, 2007, 10:35:49 pm »

it would be nice to have a two stage setup. have a small nozzle and a larger nozzle. get two hobbs pressure switches and set them for 12 psi and one for 16-18 psi.

by 18 psi it should flow a lot of liquid!

nice looking setup!

Sierra94 · « **Reply #27 on:** October 08, 2007, 05:33:19 am »

My system can handle that kind of setup. I can get a progressive controller for it that allows the water pump to pulse or go for full speed. That with using a larger nozzle would be just the same.

If it can handle a big Cummins diesel without any problems pushing 500 HP it can handle our small "toy" engines :lol:

silvertdi · « **Reply #28 on:** October 10, 2007, 06:22:57 pm »

I always thought water/alcohol injection was not good for diesel engines. Something about the latent heat of fusion and reducing the charge temperature too much.

OM617 · « **Reply #29 on:** October 11, 2007, 03:50:27 am »

There is no such thing as reducing the air temperature too much.

Author Topic: Water/alcohol injection system. Give me your opinion. (Read 12499 times)

AudiVWguy

OM617