Torque & HP Rating from gas & electric motors...

[Jeremy]

Can anyone explain the difference?
I know 5 hp electric is stronger than 5 hp gas which is stronger than the same 5 hp motor converted to propane...

What is the ratio/conversion/correlation?

 

[The Cleaning Artist]

5 hp is 5 hp
The torque is what is different

An electric motor runs at peak power continuous. The more load the more amps.
A gas motor can operate with variable power levels. IE 1000 rpm or 2000 rpm ect

If your looking at what hp does it take to spin a blower then you need to look at the engine rating at the rpm in which you intend to use it.

 

[Larry Cobb]

Jeremy;

The difference in HP is due to the rating system.

A 5 HP electric motor is designed to run @ the 5 HP power level.

A gasoline 5 HP engine will deliver 5 HP for short-term usage. For continuous power, most manufacturers would rate it @ 75-80+% of that maximum HP.

This % has increased in the last few years as engineering has improved on the gasoline engines.

With our most popular TM engine, the water-cooled 31 HP Kohler, the maximum continuous output is 26 HP or 84% of the rated HP.

The #4MP blower on that model requires 16.7 HP at maximum rated output. The pump adds another 1-2 HP.

Total HP required is about 70% of that available continuously.

Larry Cobb
Engineering over SOA Standards

 

[MerCrewser]

HP is RPM x Torque divided by 5252. Engines make a maximum torque at a certain RPM, thus Max HP at a certain RPM. Electric motors can make maximum torque at 0 RPM.