check the power this made

Ive been banging on for ages about cam timing and the gains that can be had  just do not go 109/110 :-( , also well worth looking at velocity stacks the rotax can be sensitive to them .......Damn makes me almost want an RSV again.

You defo need back to back runs on a sealed dyno to ensure a baseline and consistant results but they will only be consistant for that dyno.

Johnboy wrote: Wow, impressive, cam timing is key obviously 👍

it is when you consider the differences across the same bike ,as per Scotts comments a couple of years back this is why some bikes make great power with a few mods and others dont as the cam timing is so far out.

Johnboy wrote: Oh yes, do they have angle markets on them as well? Just to help setup?

no no no you need a degree wheel and a dti

The other great thing about cam timing is that is a relatively cost free mod if you do the work yourself.

kiwi_rsvr wrote: Ive been banging on for ages about cam timing and the gains that can be had  just do not go 109/110 :-( , also well worth looking at velocity stacks the rotax can be sensitive to them .......Damn makes me almost want an RSV again.

Mmm I'm at 110/110 with mine , I wouldn't read too much into those dyno numbers , unless you put several rsv onto the same dyno to get an average of what bikes are making what , dynojet are well known for their optimistic readings and can be manipulated to show even more power , fuchs dyno are pretty close to real term figures , the dyno they use at af1 reads low , maybe someone should sort a dyno day in the uk some time .

kiwi_rsvr wrote: also well worth looking at velocity stacks the rotax can be sensitive to them .......Damn makes me almost want an RSV again.

I'm definitely going to have a play with velocity stacks on the new to me engine...seen some double decker stacks I want to try....and I'm sure you will have another one day.

If your interested in buying the favaretti kit you better sell a kidney or rob a bank, they wanted €700 for the ti clutch plates a few years ago.

Are you lot using fixed stacks already?

Any benefit?

MountainMan wrote: All the twins used fixed stacks. Variable length only came in with the RSV4. The question with the twins is long or short. Long helping with midrange but losing top and short being the other way round. Variable length should be best of both worlds.

How are they setup if retro fitted? Rolling road time I assume? And on Gen1 and 2 there's no functionality within the ECU to provide feedback control or engine mapping which I presume the RSV4 does? Or is it a separate module that controls the movement, just depending on engine revs or something?
Sounds quite a job for someone !

MountainMan wrote: Johnboy wrote: MountainMan wrote: All the twins used fixed stacks. Variable length only came in with the RSV4. The question with the twins is long or short. Long helping with midrange but losing top and short being the other way round. Variable length should be best of both worlds. How are they setup if retro fitted? Rolling road time I assume? And on Gen1 and 2 there's no functionality within the ECU to provide feedback control or engine mapping which I presume the RSV4 does? Or is it a separate module that controls the movement, just depending on engine revs or something? Sounds quite a job for someone ! Well the Favoretti stacks use a separate module which takes it's actuation from the intake flapper valve on the gen2. Not aware of a gen1 version. On a gen1 it would need a control module taking a feed from rpm. How you would do that is beyond my engineering knowhow. No rolling road required as it would actuate at a set point in the rev range. Though a dyno session to see how effective it is would be useful.

I suppose if you actually managed to get it all working, you could have a variable map to match your riding style.
Obviously on the road you wouldn't want it set up for maximum power, more maximum torque.
This is a bit like Hondas VTech technology offering an almost split personality of an engine, in terms of max torque low revs, and max power above say 4k rpm. Obviously I could be talking a load of bollox 😳

These are the ones I'll be using
http://postimg.org/image/7g4qwrr07/

redratbike wrote: These are the ones I'll be using http://postimg.org/image/7g4qwrr07/

Shame to hide those too. How are they actuated?

Diggs345 wrote: Gabro had the faveratti ones and then sold them , if they were worth much power he would have kept them for sure , or maybe I'm wrong

think you are right .."if they did work he'd be singing their praises I'm sure

MountainMan wrote: Keeping it simple. Interested to see what effect they have.

probably have some dyno sheets somewhere but have a look on af1 its "stepisenti" on there that makes them or gabro has posted about them