Laverda RGA Jota 3 into 1 Exhausts

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Retroman

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Hi Laverdaysts,
Anyone out there know if there is a 3 into 1 design that works?
I am told that 3 into 1s don't work on the triples and that the only practical replacements to the standard black Lafronchis, which make it sound too civilised is to fit earlier Jota types upside down, which don't really suit the style of the bike.
I could get a straight through system made up that replicates the original and jet up but any ideas and experience from those who have no doubt gone through the trials and tribulations of exhaust tuning etc. would be much appreciated.
Thanks,
Nigel.
 
D&D Exhausts (Ft Worth,TX) used to sell a 3-1 for the RGS / RGA models. I had a set on my RGS and it worked quite well. I upped the main jets one size and kept the stock air box setup. The sound wasn't overly loud but with authority, I likes that  :D

I don't know if they have the patterns or are making the system anymore but you should check with them.
 
I do have a fairly good one on my 1000 SFC, but it is a one-off and the company seems not to be existing anymore... It gained 10HP and even more torque in midrange with this system. That said, most of the 3-1 I have seen so far were worse than the original system though.
 
Laverdalothar said:
,, but it is a one-off and the company seems not to be existing anymore... It gained 10HP and even more torque in midrange with this system.
Click to expand...
hey Lothar,  can ya forward me a complete set of the detailed drawings for that 3-1 system ??
reckon that mob won't mind if they've gone bust, ay.

ok,, a few photos and tube diameters will probably settle me curiosity for now. 
  inquisitive Mark  ;)
 
Hi Mark, I think the owner just retired, not went bust...

I don't have the bike with me currently, but I can check next time I'll visit her...
 
thanks Lothar, but i don't want ya going to any inconvenience.  it ain't critical.

also me memory kicked in, and i searched for the last time i bothered you for some details before.
http://www.laverdaforum.com/forum/index.php/topic,89087.msg262813.html#msg262813
but you have a few "i think" comments thrown all about in that reply ??  ::)

so yes, a good photo of that collector plumbing would be of interest.
  cheers,  Mark

 
and while i was wearing me 3-1 search hat, a couple of other comments were rediscovered.

reckon Robjota's 3-1 system must have been working ok?
http://www.laverdaforum.com/forum/index.php/topic,89999.msg279135.html#msg279135

& maybe Keith can report back on his 3-1 system?
http://www.laverdaforum.com/forum/index.php/topic,82154.msg169930.html#msg169930

& in a few weeks, i hope to have Clyde back on the dyno again, with the 3-1 Corse system.
the last dyno run it didn't pull above 7,500.  maybe was an ignition issue?  ho-hum.
 
I very much liked the look of Bevelman's new 3-1 system on his race bike. It appears to have been designed and built by someone who knows exhaust systems, and the welds are very neat. It's pretty much exactly what I would have made if I'd made my own - except for the neat welds!  :-[

I inherited his old 3-1 system. It's on my bike now exactly as it came off his, but I suspect it'll need a bit of trial and error modifying to make it work well. According to my sums it'll have good mid-range but power will flatten out at high revs (well, TBH, not my sums but those of A. Graham Bell in his book on 4-stroke tuning). If Mr Bell is correct, the headers will need shortening and the orifice at the end of the reverse cone will need opened up quite a bit. 
 
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