[SEL] horsepower formula

[jbcast at charter.net]

> > http://engines.rustyiron.com/rig/horsepower.html
> 
> Hi Rob,
>     Thanks for this formula! Five years ago I bought what I thought was a 16
> HP Galloway. (See:
> http://www.oldengine.org/members/rotigel/trailer/16_GallowayTrailer/index.html)
> Even Ted Brookover thought it was a 16 HP (see the last several pictures in
> the above.)
>     Now however (using your formula) I find that the engine that George Best
> located for me 5 years ago is a 6.9 HP engine. I'll never be able to show
> the engine again and think that I may just sell it. Do you have any idea
> what a 6.9 (likely only a 6) HP Galloway is worth?
>     I arrived at the 6.9 HP by using your formula--8.25 (bore) X 3.14=
> 25.905. 25.905 X 16 (the stroke)= 414.48. 414.48 X 225 (RPM)= 93,258. 93,258
> divided by 13,400= 6.959552238 HP.
>     I'm so ashamed! I've been telling people for the past 4 years that the
> engine was a 16 HP. Now I know that I'm wrong. I intend to put a FOR SALE
> sign on the engine at the show this weekend and the first person that wants
> a 6 HP Galloway can have it. I'll be looking for a 16 HP Galloway as soon as
> I can unload this DOG!
>     Dave
Dave, what you should be ashamed of is your math, I came up with 14.35hp, not to bad for a generic formula. If you need some help figuring the area of the piston contact me off list.
J.B. Castagnos
Belle Rose, LA