2v SBK build thread

[TAftonomos]

Confirmed....hyper motor = SBK width. 

Will order the 08' hyper S motor Monday morning, complete with electronics, ecu/keys

[TAftonomos]

So I have a few sets of triples, trying to figure which set to use.

749R triples, cast lower, adjust to 30mm offset

Section 8 billet 27mm offset triples.

The 749R triples are 1.2lbs LIGHTER than the Section 8 ones.

Any reason NOT to use the OEM/749R triples?  Sure they don't look as cool.  Do 749R race guys swap out the triples for aftermarket ones for stiffness reasons?

[Raux]

I would go with the 30m R triples.
I think a lot of superbike guys go to the 30mm to slow down the steering a bit and make it more stable. I think that's what i read on the superbike forum

[Speeddog]

More offset = less trail.

Generally, that means quicker handling.

Dunno what the racers are running, if they're swapping them out it's usually to change the geometry.

[TAftonomos]

I'm mainly interested if the racers have had issues with the case lower on the 749R triple.  I don't see the point in adding 1.2 lbs to the front end unless it's going to benefit the bike somehow ie: stiffer front end.

[junior varsity]

I am seeing lots of people running at or under the magic number "30mm".  My Ducshop triples are 30mm, but now they are doing 28mm.

I put a new design top triple from IMA on my Monster - the new "MOD4" style - it has eccentric bushes so the user can change the offset to their liking from 25-31mm, and is skeletonized up top, and has reliefs on the top as well to reduce chattering. Cool stuff - way more tech than my M900 really can use, but in a track-oriented SBK it would be really great. Also, they are lighter than the Section 8's for sure.   Not sure if you are in a 'buying' mood, or a use-what-you-got mood... but the test riders for the IMA triples said the improvements were noticeable, and one broke the lap record during a test (not sure if it was on Ledenon in France, or on Lombardore in Italy)

[TAftonomos]

I'd love to commission the build of a set of mag triples from the ingots I already have....but for the time being I'm going to use what I already have. 

[TAftonomos]

No realy updates at the moment.  I've got to finish putting the monsters heads and jugs back on after it munched on something.  That will be this week.  Once that is done I will be freed up to go all out on the 2v sbk project.

I went with the triples from the 749R.  They are a full pound less than the aftermarket billet pieces.  Gotta save where I can!

[junior varsity]

[desmoworks]

Sounds like you've got a project similar to mine going on. I've got a 999R with 749R geometry and 1100DS motor in it. Here is my solution to the pivot issue on right compared to the original on the left. Other than that the Hyper motor dropped right in... well after cutting the cross bar out of the frame where the throttle bodies sit  

[TAftonomos]

Sounds like you've got a project similar to mine going on. I've got a 999R with 749R geometry and 1100DS motor in it. Here is my solution to the pivot issue on right compared to the original on the left. Other than that the Hyper motor dropped right in... well after cutting the cross bar out of the frame where the throttle bodies sit  

Yup, made up a set (actually a bunch) of those as well.

My TB's seem to fit in there with the cross bar in place.  I removed the stepper/idle motor though.

[desmoworks]

Interesting. I couldn't get them to fit at all so I just cut it off. Thinking about doing a removable carbon support instead, but it probably isn't even needed considering the power is being reduced enormously from what the chassis is designed for.

[TAftonomos]

I think you are over complicating it with a removable carbon support.   


I wouldn't leave it out though....The thing is going to still have a ton of traction/load on it in the corners, who cares about the missing 30hp on the top end/straight.

[desmoworks]

I think you are over complicating it with a removable carbon support.   


I wouldn't leave it out though....The thing is going to still have a ton of traction/load on it in the corners, who cares about the missing 30hp on the top end/straight.

Top end is no worry, but the R motor has quite a bit more torque than the 1100 so the loads on the chassis are going to be far different. I have no way to calculate what is or isn't needed though so it is all speculation until I can feel the chassis flex or not on the track!

I had a custom carbon monocoque tail made as well as a Falcon dash reprogrammed with custom software so it will run with the single direction CAN of the 1100 system. This bike is all about over thinking! That's what makes it fun though.

[TAftonomos]

errr...749R motor has more torque than a 1100?  Last I checked a 999S with a full system makes about 4 ft-lbs more than a near stock 1100 motor.  (edit...I see you removed a 999R motor...no clue on that as I've only built/ridden a 999r that had lots of motor work)

Sounds like some impressive parts you are putting on it.  I'm just going to use a tach that works, probably a nemesis, and get down the road