What are the differences between the AF Clubmans?

[coaster]

I ......So don't hold out hope for the new version as I cant see it happening...

I really hope that is not the case, I've been holding out since they were first mentioned, I'd have one in a heartbeat if they were available

[Noddabodder]

Hmmmm, found this from a few years back.

http://www.scooterotica.co/forum/viewto ... 0&p=210508


Sad to see.

[Dimitrios_231]

This looks quite promising
The u-bend is 52mm I/D,main box entrance 55mm I/D

[Captain Pugwash]

What ratio is the tailpipe to U pipe diameter ?

[dickie]

Looks nice, what is it?

[Dimitrios_231]

Tailpipe is 20mm I/D,the u bend is 52mm at the end but as you can see it is tapered (i.e no constant diameter),it also comes with a muffler.
Take note that the volume of the exhaust is much bigger than other clubmans so in theory it needs a smaller tailpipe diameter to maintain a certain EGT.
(the Avanti and the Stratos both had the bigger tailpipe with 25mm,MB BGM and Gori 50mm Racing had 20mm tailpipe I/D diameter)

It is the new GORI GP50,
it is advertised as a high revving engine exhaust,I asked Mr.Gori about the tuned length,I didn't get any answer
it will go to a 184 ex 130 tr and 164 inlet Rapido 252cc,Mr.Gori said that these are almost perfect timing durations for this exhaust
they sent me the wrong ubend,this one is for a TS1,so I won't be able to test it soon.






This is my baby

[dickie]

I was going to use a bgm clubman I have spare for the ts1 I'm building. But now I've seen that I'm thinking about putting the bgm on my gt186 and buying a gori gp50 for the ts1. I really wanted to fit an expansion but i can't stand the look of them.

[Dimitrios_231]

If this is the case,I would first wait for a dyno graph comparison,
I have used a BGM clubman and it is a good exhaust.

Mark had done a Gori 50mm with a MB BGM comparison,
MB red - green (Left) / Gori dotted lines (Right),
Gori 50mm had slightly better results.

[dickie]

Thanks, very useful. That graph shows me that the difference is so small that I don't care.

I'll stick with the bgm.

I change my mind like my wife changes outfits when we're going out!

[Dimitrios_231]

This graph is from a standard 50mm Gori,NOT the GP50.

This is the standard Gori 50mm

[johnnyXS]

apologies for the hijack but could someone please tell me the difference in performance and running characteristics between the 42mm and 48mm Rayspeed ?
I thought that the 48mm was a typo when I recently bought what I thought was a 42mm Rayspeed. its flippin huge ! I was hoping to use it on my LiS small block 150cc

[Dimitrios_231]

If I remember correctly,
both have the same emply (without baffle plate) main body,
48mm has obviously the bigger 48mm u-bend plus stub,the tailpipe diameter of 48mm is also bigger (one inch),when it first came out,AF was quoting 500 extra revs.
48mm will rev better at higher speeds,42mm will have better torque at lower revs.
48mm was intended for bigger cc motors,
once I was building a Rapido classic 225,Ben advised to use the 42mm on this,not the 48mm.

[johnnyXS]

thanks Dimitrios thats very clear
I hadn't realised that they were made with 48mm bore I assumed wrongly that the seller was either mistaken or measuring the exterrnal diameter rather than the internal .

Sounds like this exhaust would really suit someone with a 200+cc engine whose riding is predominently touring, rallies and club runs . I wanted something with a bit more oomph for low rpm blasts around the windy twisty country lanes.!


Anyone want a 48mm rayspeed ?

[Warkton Tornado No.1]

Dimitrios

Why are you using Permatec Muffler & Tailpipe Sealer on a sprung slip joint?

Isn't the point of a sprung joint to allow for movement, specifically the high frequency movement that expansion chamber type exhausts work best with?

Perhaps the rest of the exhaust is rigidly mounted, I don't know?

[a.lo]

always liked the gori pipes and the new one looks good, but have been put off by the lack of the extra mounting underneath, seems a retrograde step. anybody confirm that they hold up well?

[Dimitrios_231]

Dimitrios

Why are you using Permatec Muffler & Tailpipe Sealer on a sprung slip joint?

To stop leaks,it works great.
It cured this.



The Avanti tailpipe has 22.75mm I/D,u-bend is 46.5 O/D

[Warkton Tornado No.1]

To stop leaks,it works great.
It cured this.

That much I sussed out!

I'm sorry, my question should have been specific to the mounting of the exhausts in general.

I believe that expansion chambers (& 'Clubman' type exhausts that are designed to behave more like expansion chambers) benefit from being mounted in such a manner that they are free to resonate. The advantages are supposedly in performance of power/torque delivery but definately in making the exhaust less likely to crack, fracture, split, call it what you will.

I hadn't realised that 'Clubman' type exhausts were still being fixed rigidly. The slip joint is only there for free orientation then, not to encourage resonance.

My mistake!

[Dimitrios_231]

You are 100% correct

I painted it black today,barbeque black,my favourite one
I removed the badge (sorry Mr.Gori)







Good day today,managed to get from my painter the powder coated short forks for the lowline.

[johnnyXS]

You are 100% correct

I painted it black today,barbeque black,my favourite one
I removed the badge (sorry Mr.Gori)

wow that sure is impressively poor welding on that bracket ...no wonder the things fall apart . there is no penetration whatsoever its what we used to call chickensh** welding

Nice paint job Dimitrious !

[Captain Pugwash]

You could easily use a soft pad on an angle grinder to clean up the excess a little, then run a tig or oxy/acetylene torch over the welds to get a little more adhesion and a smoother looking weld.

I think Original box exhaust brackets were spot welded into place prior to assembling the body of the exhaust, spot welding is usually more reliable.

But that's a decent looking exhaust you have there, let me know how it runs on the big block engine it's going onto.

Cheers, Mark.