LOL!! I wonder what she's going to teach the teacher! /o:?

Actually that could be a very cool experience for a lot of the kids, and if handled correctly it could be an excellent method of generating interest on their part while in the class.

Then towards the end of the year, like the last day of school maybe, so the poor teacher didn't have to put up with any influence it might have upon all of the students, she could bring Darrin for show and tell! (o;?

I must Say Rock Very good explanation.  :wink:  

Well that's sorta what it all boils down too, I just left out all the sordid little details. Feel free to use it next time this one get's asked George! LOL!!

I believe that was misinterpreted -

B/P: All overhead valve, and two-cylinder 4 stroke engines, 20hp and under. 42” minimum unaltered wheelbase. Mid engine frames are not allowed. 6” minimum front wheels. 8” minimum rear wheels.

The key points there being  "All two cylinder 4 stroke Lawn Mower Engines 20hp and under. The OHV Specification is added to include those in the BP class as they are expressly prohibited in other prepared classes...

CLASSES DEFINED: (based on OEM BLOCK designation)
A/P: Valve-in block 4 stroke engines 8.5hp and under. ( The largest Briggs block allowed is the Model 19). 34” minimum unaltered wheelbase. 4” minimum front wheels. 6” minimum rear wheels.

Crankshaft must be in original orientation. Engine plate may be welded to
frame rails in as close to the original location as possible.

S/P: Valve-in block single cylinder 4 stroke engines over 8.5hp . 39” minimum unaltered wheelbase. Mid engine frames are not allowed. 5” minimum front wheels. 8” minimum rear wheels.

Contact G-Team Racing

Tire page.

I could be wrong here, but I'm thinking that just shortly after that NOS hits the cylinder and it fires, your either gonna blow the head off, or blow the rod out the side of the motor. A lawn mower engine simply isn't designed to handle the forces created in the utilization of Nitrous.

George??

http://home.stny.rr.com/nosplus/Nitrous%20Theory.htm

How to Make Horsepower

An engine operates by burning fuel, which then expands and pushes the pistons down. Want to make more
horsepower? Burn more fuel so it will push the pistons down with more force. Sounds pretty simple. But, it's
not quite so easy. While there are any number of factors that make increasing power a complex engineering
problem, we will deal with three of the most basic ones here.


What Nitrous Oxide Is and What Nitrous Oxide Isn't

To your engine, nitrous oxide is a more convenient form of normal air. Since we are only interested in the
oxygen the air contains, nitrous oxide provides a simple tool for manipulating how much oxygen will be
present when you add additional fuel in an attempt to release more power. The power always comes from
the fuel source. Nitrous oxide is not a fuel. Nitrous oxide is a convenient way to add the additional oxygen
required to burn more fuel. If you add only nitrous oxide and do not add additional fuel, you would just speed
up the rate at which your engine is burning the fuel that it normally uses.

This, more often than not, leads to destructive detonation. The energy comes from the fuel, not the nitrous.
Nitrous oxide simply allows you to burn a greater quantity of fuel in the same time period; thus, the overall
effect is a tremendous increase in the total amount of energy, or power, released from the fuel and available
for accelerating your vehicle.

These are just excerpts from the article in question, it's an interesting read in it's entirety, you may want to look it over.

Likewise, Alcohol is a very dry burning fuel, and I think you're probably going to run into problems with the engine over heating with alcohol. A little bit maybe, inject too much and you're going to melt it down. See the warnings on many 2-Strokes, use of Alcohol or even many ethanol blened fuels will lean the fuel mixture out to far, causing detonation, and you'll score the piston.

Well.... how about a Briggs and Stratton link or two!

Locating your model and type number
Briggs Model Numbering System
Search by application here
Vanguard V-Twins

Once you find an engine there that looks interesting, click on it's link and that will take you to a Features and Benefits page. Top of the page there next to that title, click the Specifications tab and it'll give you all the info you seek on Dimensions and Weight!

Once you find a model and type number, you can go to Illustrated Parts List and find a complete parts break down, by plugging in the model number and type in the little search box top of the page. Then click the view .pdf link to the right of the little picture of the blank page and the complete parts breakdown for that motor group will pop up and you can save it to your computer for future reference!

But by all means keep coming back here anyhow; you never know what sort of fun and games is going to turn up around here.

As for good places to find used motors, pop up a want ad here - http://www.heymow.com/viewforum.php?f=17 . Most folks around here run verticals, but that doesn't mean they might not have a horizontal stashed someplace. Best source I know of otherwise is E-Bay. You can find some pretty sweet deals there. The Mad Machinist over at G-Team Racing has picked up several new, in the box, complete, motors for less than half list price.

On determining your CID on Briggs motor see the following pages on the Briggs website nor66

Locating Model & Type Number
Model Numbering System

16hp Opposed won't handle that many RPMs from what I've heard. Word is they have a tendency to disintegrate at much more than factory designed Rs.