REFLECTOR: Water injection
Brian Michalk
michalk at awpi.com
Thu Apr 3 21:50:07 CDT 2014
There was a lot of NACA research that the Reno racers put to use.
Google in that area.
I believe water injection would be very helpful, but mostly as an octane
booster. That alone should help CHT's. And I don't think you'll need a
five gallon tank.
Assuming you'll only use it for high power settings, like takeoff, then
you may only need about a one gallon tank. I seem to recall about 30%
water to fuel ratio would be effective for octane boost. I believe that
up to 50% would still make a lot of power, and also aid in the phase
change cooling.
There are a lot of ricer kits out on the market that use windshield
washer pumps. If one is just experimenting, that's what I would try
first. I wouldn't use it on takeoff though until you have the kinks
worked out.
This is probably something I will try in the future when I'm looking for
more work to do on the plane.
On 04/03/2014 09:41 PM, Geoff Gerhardt wrote:
> Guys,
>
> I've been considering using water injection to keep cylinder temps
> down on climb. Seems like a better idea than running full rich all
> the way up. It looks pretty straightforward, but I'm wondering if
> there's a reason why others don't use it more. For those who are not
> familiar with water injection, essentially, you spray water (or a
> water/methanol mix) into the intake (typically before the fuel servo).
> The large heat of vaporization of water pulls a lot of heat out.
> Plus, you get a bit of a performance boost both by lowering the inlet
> charge temperature as well as the steam expansion during the power
> stroke. Another nice benefit is that your pistons get a nice steam
> cleaning with every stroke.
>
>
> I figure a 5gal tank would do more than enough for a few trips if only
> used on climb. I have had some high temps when cruising at high
> altitudes as well, which it might help with.
>
> I'd welcome any
>
>
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20140403/54de240a/attachment.html>
More information about the Reflector
mailing list