Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Why no HP ratings on new engines?

Andrew's Avatar

Join Date: Apr 2003
Posts: 925

02-23-11, 05:03 PM   #1  
Why no HP ratings on new engines?

I have noticed that new power equipment, and new engines seldom list the horsepower any more. Instead, they are simply listing engine size in cc's. Why is this? I would think it would make it harder to compare and select replacement engines. Is there a cross-reference chart somewhere?

Sponsored Links
goldstar's Avatar
Forum Topic Moderator

Join Date: Oct 2002
Posts: 4,286

02-23-11, 05:38 PM   #2  
Probably because some company, I think it was Kohler but don't quote me, over stated the HP of their engines and got caught up in a class action law suit. Just CYA on the manufacturer's part.


You can trust your car - and a whole lot more - to the man who wears a star.

lawrosa's Avatar
Super Moderator

Join Date: Dec 2010
Posts: 17,607

02-23-11, 06:46 PM   #3  
There is a formula but its not linear. A 150 cc engine could be from 3hp to 6 hp. Its how its tuned. Take a 350 chevy motor. There are 200hp versions and there are 600 hp versions. Same 350 motor. Or same cc's

Mike NJ

indypower's Avatar

Join Date: Jul 2006
Posts: 754

02-24-11, 06:05 AM   #4  
The law suit removed horsepower ratings. Don;t know who file the law suit or why (probably an engine maker against another engine maker). They really screwed up everything. Consumers know horsepower as that rating has been around for ever. No one knows torque and cc's are not a real measure of anything. Cars used to and are now coming back to advertising horsepower. The insurance companies put an end to horsepower on cars by driving up the rates on the 60's muscle cars. Here is a link to approximate horsepower/cc.


cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,570

02-24-11, 09:54 AM   #5  
It's pretty crazy, I think most of the major manufacturers had some part in overstating the hp rating. More than one got in trouble over it. They would do all sorts of things to the engine (take off exhaust, remove charging system, remove air filter, rev engine to destruction) then the highest amount of hp they got before the engine blew was considered in what hp that engine was. CCs are a bit harder to exaggerate about. It is what it is and you and I can measure it in our backyards to keep them honest if we wanted to. I guess that's why they list cc's now.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

Andrew's Avatar

Join Date: Apr 2003
Posts: 925

02-24-11, 01:33 PM   #6  
Wow, what a mess! Thanks everyone for the info, and the link. Things are clearer now

Search this Thread