Brmorgan
Addicted to ArboristSite
That's SAE horsepower, an obsolete rating system now. It produces about the same amount of BHP as an 088 But the torque advantage of the 090 is huge - from a little over 5 ft-lbs to around 7. Probably helps that the 090 flywheel weighs about as much as a modern 50cc saw...
Anyway I saved the following nifty torque/horsepower chart from another thread on this site quite a while ago. I take no credit for it, and I'm not even sure who is responsible for it to give credit to. Hope they don't mind me reposting it.
PS - check out the 090G's torque rating compared the 070, which is the same engine. And some have built 090Gs with the big 137cc top-end so I can't imagine where the torque on one of those would rate.
Anyway I saved the following nifty torque/horsepower chart from another thread on this site quite a while ago. I take no credit for it, and I'm not even sure who is responsible for it to give credit to. Hope they don't mind me reposting it.
PS - check out the 090G's torque rating compared the 070, which is the same engine. And some have built 090Gs with the big 137cc top-end so I can't imagine where the torque on one of those would rate.