Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Something that I have been wondering about for sometime

Take for example the B&S Quantum engine. It is 190cc capacity, but comes in various HP outputs from 4? to 6.5.

 What do they do to alter the power output without changing capacity? Cam profile, Ignition timing ??????

Probably a really stupid question, but anyway... Have a great Christmas all.......

I'm assuming its the stroke.

Yeah, but that would change the capacity of the engine from 190cc

yes it would, I was just testing you... you passed
I guess the only thing left is cam profile and jetting
They probably fatten the carb up a bit.

     all the engines are the same !!!!!  it has to with  marketing. for example certain  oem's  only want a 5hp engine.   there is no way the can make an individual engine for each rated horsepower.    if you notice  most manufacturers  now or next year are no longer putting horsepower ratings on engines.  it wil be only  cc's output.

seems to be as of this year(20070 they are putting the torque rating on there. the valve size and compression ratio may be a part of it aswell i would guess that the reason for various outputs for the same capacety is proably the fact that they are rated at different rpm's. they proably limit the lower output motors throttle to give it less power even though it is capable of more.