On Jul 27, 9:33 am, wrote:
On Jul 26, 2:54 am, wrote:
I plan to run N2O into the air/fuel injector of my Aprilia SR50 Ditech
scooter at 5 bar, around 75 PSI.
Will it blow up--that is my question.
If it will, I will try propane. If not, I'll work it out and do a
nitrous run on this tiny scooter.
The air line is contaminated by "spooge", an oil-water mix generated
by the onboard injection air compressor operated by crankshaft cam and
processing engine air which is mixed with an oil mist at the reed
valve intake, after the throttle body. "Scootnfast" has outlined a
spooge filter; I have one and the engine runs cleaner and better with
it in place. I drain my filter every time I have a SLOP (Sudden Loss
of Power). I should do it more often than that.
I get 96 mph driving hard, and well over 100 mph on cruises. Synerject
invented and provides the components for Aprilia's Ditech
impementation of the direct air injection technology, which atomizes
gasoline to 8 microns. I hope to build a direct air injection
airfcraft engine one day, because the economy would be world-class;
aircraft economy is a real big factor in air travel for light air and
some for experimental, not so much for ultralight.
Sure, if I ran O2 in this line, it would explode very likely, but how
"strong" is N2O as an oxidizer at 5 bar?
If I disassembled all lines and the injector body, and cleaned out the
oil traces, would N2O injection then be safe? You see, if I did that,
I could run an onboard oilless electric powered air compressor and
have some fun switching between air and nitrous oxide.
Always some fun to be had around here.
Doug Goncz
Replikon Research
Seven Corners, VA 22044-0394
I'm assuming you mean 96 and 100 MPG, there...
Anyway, when you introduce nitrous oxide, you must also introduce more
fuel. The N2O breaks down into N2 and O2, and that O2 is gonna make
you lean.
Dave- Hide quoted text -
- Show quoted text -
Riiight. And lean mixtures knock, right? So, um, that would mean a
holed piston crown? Yuck. I only have one SR50 piston and it's already
inside the engine! Maybe propane is the thing to try; at 135 psi at
ambient temperatures, it is easily regulated to the 7 bar design
pressure, around 75 psi
Thanks to Dennis, Eric, Jim, Louis, Stan and Terry, too,
The SR50 atomizes fuel to 8 microns (revoulationary surface to volume
ratio) by co-injecting air at 7 bar through an injector designed and
marketed as a component by Synergect, who recently opened a pant a few
hunderd miles south of hear in Norfolk. It's amazing. My mileage is 96
driven hard, over 100 mph at cruis (near 50 mph) , the muffler is
always clean, there is no visible smoke at all, even on cold idle, and
it uses much less oil as well.
The problem is the engine air with oil mist is compressed to run the
mixing injector which fires only when all ports are closed, so there
is no unburned mixture scavenging and associated waste. Well, Aprilia
forget that water vapor doesn't compress without limit. I call the
result "spooge" and just drained an ounce today from my miniature
Norgren filter. That was first suggested by a user called Scootnfast
on the AF1 Aprilia board where I am user name DGoncz. See the board
for more. I was thinking a reed valve on the injector air compressor
crown would allow fresh air in and then there'd be no spooge, but how
would I keep the injector compressor piston lubed properly then? You
see, this engine has two pistons; there is a small one for injector
air, and the usual setup for combustion and power.
Here's Synergect's definitive paper on the system:
From
http://www.apriliaforum.com/techtips.htm
at the bottom is
http://www.apriliaforum.com/techtips/sr50/orbital.pdf
Doug Goncz
2007 Smithy Super Shop
P.S. Nice to be back here in rcm.
Doug