High Horsepower Dyno – Hewitt Inertia Dyno

This is a dyno for someone who wants to dyno engines from 4 hp up to 100 or more. It uses just a simple mechanical coupler to add one or more of the flywheels. I have four of these dynos in the U.S. We normally install a larger axle to eliminate axle flex of the higher horsepower engines. This machine also had a electrically controlled hydraulic system which could be controlled out side of the dyno room to heat the engine head temp up to 300 degrees or more.  All data systems come with a S.A.E. weather correction system. Most customers order head temperature and some use a exhaust sensor in the crankcase oil to make sure engine is up to temp. Air/fuel ratio is now available as an option.  Questions?  Want to purchase? Call me…

Torque & Horsepower in Relation to Engine RPM

Here’s a multiple dyno graph overlay that includes torque & horsepower in relation to engine rpm. You can compare up to 6 graphs at a time, click on any part of the graphs to compare horsepower or torque at an exact rpm and see that number in 1/100ths of an increment on the right side. This also works when dynoing clutchs.  Do a graph overlay and compare in time to see which clutch locks up first with the least amount of slippage. Very handy when testing and comparing headers, cams, pipes, clutches, etc. or any internal or external part that affects horsepower or power to the ground.

Sling Shot Inertia Dyno – Hewitt Inertia Dyno’s

Used on v-twin briggs engines on dirt type race cars. We made a quick change #40 chain two piece split sprocket so he can change from 3-to-1 or 4-to-1 ratio. This engine has electric start so he just hooks up battery, starts engine, turns on the data system and hits the gas. This dyno is accurate to 1/10th of a horsepower & also is a clutch dyno. Measures engagement rpm, slippage ratio and also measures where total lock-up of clutch occurs.  Interested in a Sling Shot?   Give me a ring.  Stan