Alberto,
Check out this website for engine information. They have some good
dimensioned drawings of the engine as well as HP and Torque curves.
http://www.briggsracing.com/model20engine.html
As for tubing, we have used 1.25"*.065" A36 steel. This tubing far exceeded
the minimum set it the rules. There are other tubing dimensions as well, for
example, we have used 1.25"x.049. I would not recommend this tubing because it
barely met the equivalence. It was strong enough, but it tended to dent
locally far too easily. I would recommend that you work the equivalency
calculations your self, you will sleep better at night.
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