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K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Car
Satisfied Customers: 2963
Experience:  ASE Certified Technician, Associates Degree 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 11 months 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 other Car Specialists are ready to help you
Customer: replied 11 months 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