[jadleybray]

Just my $.02 on dynos and tires:

I know on street drag bikes we see up to 8 hp difference between a normal street tire and a Shinko ultrasoft drag tire. This is with the same bike on the same dyno - you just gotta take that into consideration when talking dyno numbers. Oring vs non-oring chain makes a tiny difference too.

What do you mean by take it into consideration, the street tire was slippin on the drum, and the motor made the same hp just couldn;'t get it too the dyno. As long as your tire stays to the drum, no slippin, its doesn't matter what tire your using.

 

[johnnycrash]

What do you mean by take it into consideration, the street tire was slippin on the drum, and the motor made the same hp just couldn;'t get it too the dyno. As long as your tire stays to the drum, no slippin, its doesn't matter what tire your using.

Nope, neither tire was/is spinning - we strap them down. The heavier and softer drag tire has more parasitic loss than the harder street tire. I would think that's pretty easy to understand.

If you want apples to apples you need the same tire and the same dyno.

 

[johnnycrash]

Run the same setup, tires and gearing, everytime you make a pull, thus eliminating inconsistencies. One dyno to another is not comparable.

So right here you agree with me but two posts later you don't? :blink:

 

[370]

what do you use for dyno tires? around here the dyno owners all use american racer 10/10/18 sd33's at 10 psi and the only thing i have seen break 60hp are big banshees(425-525) and the highest of them was 78 hp

big banshees only making 78hp? def something wrong there.. 421cc shees are easily breakgin the 100hp mark on alky.. and more than a few are gettign there on gas.. .

 

[370]

(It don't take much to get 60 out of a Banshee...)

yep yep.. i've gotten it done with fmf fatties, a midrange port, and left everything else stock.. the guy was short on cash and didn;t even do any headwork... still had the stock carbs and airbox too.. pulled 62hp..


60hp is a trail banshee around here..