Ive got a 80/66 cc engine. Does anyone know the standard horepower these engines get? Or how I can find out how much they have stock
Getting compression up a bit helps some alright, but most important thing with and engine is getting it to breathe as good as possible, some cleaned up ports and a well tuned carb along with an unrestricted exhaust is key to getting a nice performance boost with these little engines.Thank ya. I knew it couldnt too much but i wasnt sure exactly where it was at. Ive ported my engine a little bit and got some more compression on it but i doubt it makes too much of a HP difference.
That's a bit overgeneralizing. It depends on the expansion chamber. An "off the shelf" exhaust can give more average power than a supposedA well designed expansion chamber will give better top end, an off the shelf expansion chamber is more likely to give better low to mid.
HP is a number derived from the solution (torque * RPM / 5252). HP is not derived from revs, it is derived from torque at any RPM.Real HP increase is through revs, HP = torque x revs.
I had a Grubee GT5 (66CC) with a factory badge stuck on it with date of manufacture that claimed it was 2.75HP @ 5x00 RPM (forget the exact RPM it said).
Might have been about accurate with the stock kit gear it came with. That one had one of the black cat pipes. Seemed to have less power than 2 of the Dax 66 I had.
From my experience, the power varies widely with the bigger chinagirl engines. You might get a crappy one with lots of gear noise that struggles to rev, you might get an eager, quiet engine that runs easily and revs over 7K. Lots of in-between. There's 5 days in a week and only one of em is a Wednesday lol
2.5-3.5HP is about the range I'd guesstimate stock. There is no "standard" because build quality varies so much with them.
IMHO the important thing to consider with the 66 is the torque. They can make great torque without revving high.