180 deg triple exhaust

andre g

andre g

Hero member
Hi,
for my cafe racer I?m locking for a good exhaust system.
The photo shows it with a 120 deg SFC engine but now I have fitted a 180 deg 1200 engine with small head 32 mm inlet and standard cams. 4C? don?t know exactly but nothing special.
I just want to use it as a street bike and enjoy the high torque at low revs.

I have a set of 120 deg SFC down pipes and the collector as well. Could I use it or would it be better to use other down pipes ans an other collector as well? I have heard collectors are different.
Which exhaust pipes would fit? Jotas in this combination, that  would be easy. I do not know a lot about the 180 deg exhausts because the other bikes all have 120 engines, RGS and SFC?c.
I more would like to have a good 3 in 1. Any idea and where would be a good source.
Also need the flanges.
Thanks for any idea.
Andre
 

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Hi Andre,

As the pulses in a 180? configuration are a bit different than in a 120? configuration, I am sure the best would be to have a system taylored for 180? engines. However, if the engine sits in the same position in the frame as the 120? before and we are talking about a MK2 180? engine, physically the 120? headers should fit.

To state what exhaust is best needs some more information about the engine itself. What displacement, what head, what cams, please?

I run a 3-2 configuration (not a 3-1-2 but really 3-2) on my Jota which runs very sweet. search for my nickname as the author and "collector" as the key word, for sure some pics come up.

I will test my 120? SFC SR 3-2-1 Exhaust on the Motoplast as soon as I can, but that will take another year or so before I get her on the road. Maybe to late for you...
 
Andre,

Run the headers into a big, fat collector a la Jota and you'll be fine for starters.  Will give you all the grunt you want/need on a road bike.  The stock 120? collector is useless on a 180?... and vice versa!

Really don't know which sound I prefer, a thundering 180, or a screaming, spine-chilling 120. I think they both do it for me. :D

Cheers,
piet
 
sfcpiet said:
Andre,

Run the headers into a big, fat collector a la Jota and you'll be fine for starters.  Will give you all the grunt you want/need on a road bike.  The stock 120? collector is useless on a 180?... and vice versa!

Really don't know which sound I prefer, a thundering 180, or a screaming, spine-chilling 120. I think they both do it for me. :D

Cheers,
piet
Click to expand...

..and here I was thinking you were primarily a Zane aficionado...

Yogi
 
Hi,
Thanks for reply.
Questions are not solved.
Piet, we also could discuss it at the pone as well as Lothar but lets continue.
Lothar, as I have told 1200 cc which means 80 mm pistons, high comp 10:1, Cam, don?t know, but nothing special. Do not know the spec but was was installed in the 80th.Will not open the head covers.

What I wanted to know is what is the best experience with this spec. What would work fine?
I don't won't to calculate with exhaust gas speed of 500 M/sec and puls frequencies of 30 to 60 Herz.... That I did in my two stoke times...

Piet, as you said the collector should be big. How big? Could I modify a 120 deg collector which has a  approx. 200-300 cc tube to a 500 cc or bigger tube. Would that be the solution? How big? 1 liter ?
Ok , you said, I should use a Jota collector, I could look for one. Will ask you and the other suspects.
Tschau
Andre

Jota Pipes, which one, Keihans, Malcom Cox? Had some Cambells which were  different to others, bigger end diameter and shorter pipes inside, any similar on the market? ( sorry smashed they on a race track).
Thanks
Andre

 
Hi Andre,

I can only talk about my experience with the Jota. The Keihan collector is crap, as are the factory ones (compared to modern knowledge of gas flow requirements).

I would use 37 - 40 mm downpipes (outer diameter, inner not below 34mm!). For the Collector, we used the Keihan one and cut almost everything off except the 3-joint. Exhaust guy then welded 2 pipes in with 34mm (inner Diameter)each (which totals up to a 50mm diameter collector box roughly. These pipes gently bent to the rear of the bike where they end into 2 Campbell Jota pipes with a 32mm exit tube that protrudes into the exhaust can roughly the same 2 cm as they reach out of the exhaust can.

Works quite well on a similar setup as yours (80mm pistons, 10,5:1 compression, SFC spec head, 4/C cams). See:

Jota-Sammler01.JPG


all "tailed" collectors (which I had before...) are producing a back-draft that kills revs (at least that was the case on my bike...).

Malcom's Jota can's - I think - are copies of the Campbell's one. Customers said they are high quality, which I trust they are. However, the downpipes are copies of the standard ones which had 32 inner diameter and the collectors is also a copy of the factory one, wich my exhaust guy wasn't really impressed with (talking about the shape of the original ones, not of Mr. Cox's products here, please!).

HTH
 
Andre,

the current evolutionary stage of 180?  - 3 in 1 - exhausts in Austria,

Bernhard Zojer's race version in the last row and Gerts street ( ;)) version in the fourth-to-last row:

http://www.laverdafreunde.at/English/2015Spring.html

Jens
 
Yes, he hasn't used fresh header pipe gaskets so that's where he lets the oil out.
 
Paul Marx said:
Hey Lothar, is that an o?l drain plug on the collector?
Paul
Click to expand...

Na - this is where the Turbo can be linked to the Exhaust... As the bike puts out more power without the turbo already than most people can handle, I left it off... :P

:D :D :D

(not sure I won the pi-ing competition now, but was worth a try...).
 
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