Alcohol injection under SC, not turbo

[AverageJoe]

I have a few questions for you alcohol experts. I've been around GNs for prolly 3 years, and know my way around one quite well. I'm also rather privy on the subject of alcohol/water injection.

I know how well the power injection works under a turbo system, but here's what i want your thoughts on. How well do you suppose it would work on a high boost centrifigal super charger setup? Same basic setup, its just a difference in how the compressor is driven. Since the SMC kit doesn't tap into anything except power and boost, would it know any difference between a turbo setup and an SC setup?

Like I say, give it your thoughts and let me know what you think. A friend of mine wants to try it out when he puts a 12psi ProCharger on his 98 GT.

 

[blackbuick87]

Lots of guys use alky and superchargers.

Yellow95 on this board has a SC 95 Mustang with alky

Go through the posts in this section you will find a plethora of info

 

[MEAN LT1]

Alky works very well on any force inducted application. Im goin to use it on my ati prochargered Z-28. It should work just fine with my application, the only reason im using the alky is for an extra level of protection against a blown head gasket. I do have a front mount intercooler but its only a two core wich is fine but I think with the addition of the alky injection it'll run alot cooler than with just the front mount on there. The alky is activated by a ceratin boost level that you decide on where it comes on at. Im having mine come on at 5psi. I'll pbe pullied for 9psi but i dought i'll see that through the intercooler since it takes away a little boost.

 

[Turbo__Tim]

OK, using 'roots' as a search word I came up with this. I have to admit that it is a very clever system, cheap, and well thought out.

I have to wonder if one were to use a PWM (use that as a search word) valve would assist in that system. This way alchy delivery would increase with rpm's. This would elliminate low end bog, and high end starve-out.

5 or 14 psi doesn't sound like enough pressure to atomize the mixture, but apparently the heat of the blower, and all them spinning blades do that part of the job. Anyway here it is....

wilkinshc
Some Throttle More Bottle

Registered: May 2001
Location: Rio Rancho NM
Posts: 355
Davbrucas,

Something to consider also is to run a line from the boost side of the blower thru a 5psi (or what ever level boost you want it to come on with)one way valve to a sealed tank (top end of tank) then a line coming off the bottom of the tank with a 5psi one valve to the carb to spray in the water/alky mixture. No pumps to worry about. Easier to get the jetting right no matter what boost level you run. What happen is when the boost level reaches 5lbs it pressurizes the tank and pushes the mixture to the jet. The more boost you run the more the psi in the tank and the more the mixture. By run 2 one way valves you double the insurance on the only thing that can break. I made this same setup for about $60. The best mixture is 50/50 with 50% being the most you want to run as you can promote detonation with a higher level of alky then that. Not that you can't run 100% alky but you should get more out of 50% or a little less.

Chuck

 

[AverageJoe]

Thanks for the input guys. How about this, would it be possible to spray it before a roots type SC, or would that ruin its effect and/or damage the blower? Any other thoughts on the subject?

 

[blackbuick87]

You want to inject after the blower so the pressurized charge can atomize the alcohol

Dont think the charger would like injecting before it, especially over the long term

 

[JDEstill]

Since it is typical to put carbs before a Roots blower, I would think a little alky/water injection there would not be too much different...

Chuck, I've been thinking how great it would be to have a modulated system like you mentioned. Increasing water/alky flow with rpm would be great, to maintain some kind of control over the air/fuel/water ratio. I was pondering the use of a separate ecm of some kind, like a MegaSquirt, to run a couple of throttle body injectors that would be injecting alky/water. MAP and rpm are the only inputs it would need, and it could give you the perfect amount of alky every time all the time. Gotta be better than the current systems, albeit more expensive. Just my dream. Someday I'll make it reality.

John

 

[1badTTA]

Since it is typical to put carbs before a Roots blower, I would think a little alky/water injection there would not be too much different

Just remember that gasoline has much better lubrication properties than water and alcohol, shouldn't be a problem with a little marvel mystery oil though.

 

[iamjeff]

it is my understanding that turbos and centrifugal superchargers are essentially the same. they have very simular designs, except the one is driven by a belt and one is driven by exhaust gasses. but maybe i am mistaken....

-jeff