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K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Car
Satisfied Customers: 2510
Experience:  AA in automotive Technology, 15+ years in the trade
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Preview before question: I am going to modify a small 6HP

This answer was rated:

preview before question: I am going to modify a small 6HP gas engine 4 stroke to see if it changes to a more efficient engine on gasoline..
Question: what can I measure on the engine before the modification and after the modification so I can tell if the engine is more efficient?

The easiest way would be to add a quantity of gasoline, say 4 ounces, start the engine and time how long it runs before running out of gas. This will give you an idea of efficiancy before and after the modification.

Customer: replied 1 month ago.
should I keep the RPM's the same before mod and after mod?

Yep, keep it at the same speed. This way the only variable is the mod.

K. Wiggins and 3 other Car Specialists are ready to help you
Customer: replied 1 month ago.
for an example: before mod rpm is at 2,000, 4 oz fuel, 30 minutes it ran.
after mod rpm is at 2,000, 4 oz fuel, 1 hour it ran.
would that mean friction was reduced by 50%?

Correct