I did a search to try and find a formula or system to determine how much horsepower is gained from losing rotating weight but had no luck.So far i have lost 11 lbs of rotating weight by switching to lightened hubs and buffed tires and light wheels and i may do the 520 conversion as well.It just makes sense that i will gain performance from this but i would like to know just what i have gained in terms of horsepower,any ideas.

 

For every 1 lb you take off rotating its equivilent to taking about 8 lb off the bike. So 11 lb of rotating might be like taking 80-88 lb off your bike. I might be a little off.


Also, For an HP guess I would say it could be the same as gaining 4 -5 hp. Based off 11lb dropp.

 

rotational weight = the rotational acceleration * the mass of the rotating object * .9 (Friction Co-eff)

 

That would help me to off set my 230 lb weight in a drag race.The 520 chain conversion is looking like it would be worth the trouble and cost as well.This will be a fun project and with enough effort it should produce good results.

 

Dragon i will show those numbers to a friend that is way better at equations than i am.I am one of those who is not well versed in mathematics.I guess in a couple of weeks you can try my stock bore for yourself and give me your opinion.Are you still going to Florence on the weekend of the fourth?

 

We seen approx 3hp gain on the dyno with the 520 driveline and jj&a aluminum axle/hubs and of course the lightweight wheels on my stock engine. [img]i/expressions/face-icon-small-wink.gif[/img] Its pretty huge. The best part about it is the fact that is total reliable...unlike engine parts that tend to break. [img]i/expressions/face-icon-small-happy.gif[/img]

 

Yep, we will be there that weekend, and I cannot wait. I would do the math portion, but don't know what all the numbers are to plug in...I would really like to run them against each other to see where I stack up. I was really hoping to pull of some cams by this trip, but they may just have too wait until DSDays...

 

I showed a 1 to 2 length gain by going to the 520. You will notice a difference. Going full on axle, 520, buff's in huge. The problem is finding the gearing. The motor revs way faster. Its over 20lbs less mass.

What time are you gonna be at Florence and what color is your bike?

 

I would have to agree with that. 22 lbs feels like 8 to 10 hp seat of the pants! Another benefit I would guess is that your clutch is going to last longer due to the less force it takes to hold it.

So by your calculations 22 lbs is like taking 160lbs off the bike? Wow thats like me weighing 45 lbs gotta dig that![img]i/expressions/face-icon-small-wink.gif[/img]