water/alky injection on high compression big block

[shiftless]

Hi guys, I know this isn't a Buick question but you seem to be the subject matter experts when it comes to water/alky injection. I'm building a Caddy 500 big block for my Cutlass and I would like to run 12.5:1 compression on the street. So, I thought water injection would be the ticket.

Has anyone here had experience with water injection on a high compression N/A motor? Do you think I will be able to run 93 octane and keep timing at or near stock, if I tune the kit correctly? When I want it to really scream I can always pour in a few gallons of toluene and bump the timing up.

I was looking at this kit:

http://becooling.safeshopper.com/31/175.htm?816

which seems to be a pretty good deal, I will be able to trigger it with a vacuum signal (using a 0-5V sensor), and adjust the rate at which the spray comes on, etc. I can also mount it in my trunk with the reservoir of my choice.

Can you give me some tips on reservoir selection? One person on the Cadillac forums suggested that I look into outboard marine fuel tanks. I think that might be a good idea since there would be provisions included for baffling and a fuel level sender.

Thanks for any insight you can provide.

 

[1badTTA]

I have not heard of anyone being able to run 12:1 or higher with water injection on an NA engine, but it may be possible. Another thing you might look into is propane injection, since Alky helps cool the incoming air and propane helps with the actual combustion process it may work better for you. Just something to look into. HTH

 

[Razor]

I havent done any NA systems yet. I do know there are 1 bar MAP sensors that work on vacuum. So trigger it when vacuum goes under 3 inches?

I dont know how it will work for you. I too have systems that will trigger off of the MAP..

For containers I use the GM overflows with great success. The shorter the lines, the happier the system.

The outboard marine tanks fuel sending unit may not be compatible with alcohol.

HTH

 

[ITSAV6]

propane

You could just convert over to propane. Then you would have high octane all the time as well as the cooling of the intake tract too. Hell i even had a propane carb that fit a quadrajet intake a few years ago but threw it away.

 

[turbo buicks]

http://www.wps.com/LPG/LPG-book-final.html

 

[shiftless]

I've already studied up on LPG years ago, and while it's promising, it's just not an option on daily driven street cars in my area. Premium fuel is much more common and easier to obtain. Water injection is a better alternative to me.

The reason I was avoiding an overflow tank was due to the small capacity. I was looking at injecting 20-25% water per volume of gasolune. That would require a larger (3-5 gallon) storage tank for safety and convenience.

Thanks for the MAP sensor idea; I thought of that as well and I have a GM 1-bar sensor laying around I can use. In order to keep the system from running when the ignition is turned off (no vacuum) I will set up an ignition switch-triggered solenoid as well as a hand toggle switch to control it.

Thanks for the tip on the marine tanks. I may just use a 5-gallon bucket, with homemade baffles, and then once I get that working I can rig up some sort of fuel level sender. The system I'm looking at features a 100psi pump that will be trunk mounted with the tank, and the solenoid will be upstream right at the spray nozzle.

 

[shiftless]

Ok, I broke down and started looking at propane again. Unfortunately, trying to find detailed information and pricing on the components needed is like pulling teeth. Anyone here done a conversion on a V8?