New to me RGS (aka the big bus)

Hmm, well back then horsepower was measured at the filler cap or was a figure plucked out of the air over a liquid lunch.  Just looks too skinny to flow much gas (OK, I know that's not the only important thing in exhaust design, a notoriously inexact science from what I can tell).  I'd only believe a side by side dyno test.
 
I believe that the left one is standard for the RGS and is supposed to be better for these. But my system is apparently
from a 180 and has the larger bore collector on the right. I doubt if changing over would pull my arms from their sockets.




 
Being seam welded at the sides the RGS/Corsa collector was claimed to flow better because there were less welds and awkward join angles for the individual sections that made up the collector.
Does look slimmer overall though, and more fragile. I had to have my last one welded up as it was perforated, and the welder said it was a right mare to weld up.
 
Kiwi Laverda said:
When you have done the ignition, cam chains and the merc primary, there is always.........
- Mikuni RS36's
- GSXR wheels
- Emulators in the forks
- New rear shocks
Click to expand...

I have weapons for the twisties already  :D This is not going to be my money pit.

 
That white thing's taken a beating with the ugly stick, hasn't it?
 
Says he with a fugging BM with girders holding up football pitch floodlights...  :P :-* :D
 
Reggie3cl said:
Hmm, well back then horsepower was measured at the filler cap or was a figure plucked out of the air over a liquid lunch.  Just looks too skinny to flow much gas (OK, I know that's not the only important thing in exhaust design, a notoriously inexact science from what I can tell).   I'd only believe a side by side dyno test.
Click to expand...

Reggie,

The left collector would have been standard factory fitment on all 120? RG series bikes.  The big bore collector doesn't really work on a stock 120, many will now cry otherwise... reckon they haven't been on a dyno yet. :D  Did a lot of testing and experimenting with 120 systems on the Moto Witt dyno, always came back to the stock collector, and silencers!  Overall, a very efficient system, even with a fire breathing 1180cc  engine.

The production method using 2 pressings is a) cheaper, and b) more accurate (in that it flowed better) than a component welded up from short bits of tube.

piet
 
The left collector would have been standard factory fitment on all 120? RG series bikes.  The big bore collector doesn't really work on a stock 120, many will now cry otherwise...
Click to expand...

Interesting, I did know that there was more to it other than volume (both types!)

Reminds me, I must run my bike up on a dyno before I start spending money on the engine- Keith was up here a day or so ago and we discussed him redoing the head (has suffered major catastrophe at some time) and giving it a rebore so it would be nice to know how the engine progresses as I have it refurbished, although those collector boxes must be rare.

And as my local dyno is next door to a brewery, there are two reasons to get along there...
 
It was on the Corsa when I bought it.
You could try Wolfgang, Slater, OCT, Wagner but I think they will be thin on the ground.
 
They are indeed very thin... only got one in stock, my own spare, hanging on to that! :D

There's a lot more to it, Reggie.  Actually, we ended up with a ugly, awfull looking system that looked very similar to what Triumph fits to their "little" triple trailies these days.  Short primaries ending in front of the cylinders with a loooong collector branching into 2 silencers in the normal position.  Gave best results through the entire rev range, we felt the world wasn't ready for it yet!

piet
 
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