Nitrous anyone?

[audijunky]

Kinda bored, so figured I would ask. Anyone got it? Seen it on an 11? Just figured I throw it out there. Can you use it with carbs?

[Snow]

I'd suspect there are a few XS11's out there with nitrous - you could probably route it in through the carb boot vacuum nipples I'd suspect

[audijunky]

The boot between carbs and head I presume. Is that possible. I know with fuel injection the nitrous is mixed w/ the air before being mixed w/fuel?

[Snow]

The NOS instructions for a Harley kit have a wet kit that joins extra fuel and nitrous oxide in the boot:

http://www.mpsracing.com/Instructions/NOS/Wet_Kit.pdf

[HobbyMan]

If you put NOS in the air before the carbs, you would have to mix some extra O2 to make up for the displaced oxygen from the nos. It would make the mixture too rich without it. If you added it after the carbs, before the intake, you wouldn't have any problems. Would the pistons/etc.. get damaged?

[Douglas Money]

A property of nitrous oxide is that at about 565 degrees F., it breaks down into nitrogen and oxygen. When it is introduced into the intake tract of an internal combustion engine, it is sucked into the combustion chamber and, on the compression stroke, when the charge air temperature reachs 565 deg., a very oxygen-rich mixture results. If we add extra fuel during nitrous oxide injection, the effect is like a super charger or increasing the compression ratio of the engine. Automotive nitrous systems work like the automotive eqivalent of a jet's "afterburner" and is used for short duration extra bursts of power.

Nitrous oxide has this effect because it has a higher percentage of oxygen content than does the air in the atmosphere. Nitrous has 36% oxygen by weight and the atmosphere has 23%. Additionally, nitrous oxide is 50% more dense than air at the same pressure. Thus, a cubic foot of nitrous oxide contains 2.3 times as much oxygen as a cubic foot of air. Just do a bit of math in your head and you can see if we substitute some nitrous oxide for some of the air going into an engine than add the appropriate amount of additional fuel, the engine is going to put out more power.

[HobbyMan]

oic



Ha, I beat a 1 word post

[mainlylinux]

insert beavis and butthead remark about "nipples".

:-)

Originally posted by Snow
I'd suspect there are a few XS11's out there with nitrous - you could probably route it in through the carb boot vacuum nipples I'd suspect

[mro]

nitrous oxide

The flat slide carbs on my Hot Rod XS are set up with ports for nitrous on the head side. (capped off now)

Return throttle cable broke.
Let off and NO slow down...
Just glad was not in a turn at the time


mro

[Pat Kelly]

Nitrous was originally used on internal combustion engines in WW1 aircraft. The oxygen injected via nitrous allowed the aircraft to fly at higher altitudes where oxygen wasn't as plentiful.

It's basically chemical supercharging, stuffing more O2 (and fuel) that a normally aspirated engine could on it's own.

[goldcoastguy001]

Pat and Douglas are right....good one pat to remember bout the planes too...Nos was also used in the hospitals refered to as laughing gas(different content, so dont go robbing your local ER Ward).......dont go putting a Nos kit on your xs without adding the right amount of fuel...you can port inject the Nos thru the vavuum boots but you'll have to play with the right amount of fuel to go with it.....if you dont you'll lean you mixture immediately when you hit the button or trigger however you set it up and risk melting a hole in a piston or two....experience from my drag car, but i would start by using a bike kit for a similar size bike and over size the fuel injection jets to ensure your mixture is really rich when you hit the Nos, then you can down size to suit without too much risk.....

If you intend to home make the kit I would look at port injection just for the extra fuel too standard pistons should be ok....but i'd make sure you have a good head gasket and upper cyl seals...much bigger bang means way more pressure on those stock items.
I like the term "Throttle in a Bottle!", had lots of Exp. with Nos on carsa but never fitted it to a bike..I like to know how you go should you chase the idea all the way.

Does it really need Nos you need to ask youself.....lol..

[Pat Kelly]

Since two solenoids activate 1) the Nos and 2) fuel, you would need fuel feed to the carb boots.
Drill and tap for two lines to each carb boot. Nos line to each boot.
Have one petcock feed all the carbs. Have the other petcock feed a pressure regulator and electric fuel pump that is activated by the fuel solenoid.
Hit the button and the solenoids increase the O2 (Nos) and fuel at the same time. Same set-up they'd use on a 4 cyl car.

I don't want or need it on either of my XS's....... but it would sure be fun. Either the back tire will smoke or you'll wheelie over.

If I wanted a faster bike I'd buy one rather than pushing a lead weight faster that it's designed for.

[audijunky]

Yeah,
probably not going to do it just thought I would put it out there for discussion.