103 Supertrapp Supermeg 2-1 - amount of discs?

[Finn]

What is the amount of discs you typically use on a 103? This is with closed end cap.

If I recall correctly Supermeg is delivered with 20 discs and I would need to know if I need more for approaching workshop and dyno session.

[Hillside Motorcycle]

Bring extra with you.
We have seen even our High Output 80" Evo's in the 28-30 plate zone

[Finn]

I'll tell them to order an extra 12-pack of discs to start with. Thanks! 

[scoopfraser]

It might be worth having an extra closed end cap that can be drilled for the air/fuel probe as well.  If you end up running more than ~26 discs you'll need some longer screws (#12-24 aka 3/16-24 cap screws).

[kd]

It will also depend on the size of the discs (3", 4" or more ?).  SuperTrapp's "tuning manual" states that the open end cap has a value of 8 to 12 discs. I suspect that would depend on engine displacement, cams and compression effect.  A while back (2 years?) someone on this site mentioned that their testing or measurements gave a value of 3 discs to a 3/16 " lock washer between the discs.  The spacing is very close between the discs when mounted as directed by SuperTrapp.  I was hoping to do some dyno testing with my Burns pipe fixture but that's on hold now with this virus epidemic. I wouldn't go to the dyno without enough components to go the full distance if necessary.

[Deye76]

The 2004 bagger I had, 113", 10.5:1 CR, 13 discs open end cap.

[Hillside Motorcycle]

In some cases, an open end cap is needed.
Yeeears ago, Supertrapp shared their drawings with us for the XR baffles.
We replicated those on a couple bikes.
Low end torque loss, but exposed the hidden hp, for which was the intent of their design.

[Deye76]

I was surprised, this one I referred to, didn't do to bad for the cam used (not considered a TQ cam) was only 186psi CCC. Broke 100tq around 2250rpm. Was in a bagger. The ST did better than the Thunder Header that was on it. The SAE version was 2 tq & 3 hp less.

[Hillside Motorcycle]

I was surprised, this one I referred to, didn't do to bad for the cam used (not considered a TQ cam) was only 186psi CCC. Broke 100tq around 2250rpm. Was in a bagger. The ST did better than the Thunder Header that was on it. The SAE version was 2 tq & 3 hp less.

SAE averages at best that.
Not the 15-20% of Greek mythology/sewing circle lore.