Siggy Manx and dual IDF Carbs

Don Giovanoni · Post by **Don Giovanoni** » Fri Aug 15, 2008 6:26 pm

I have been gathering pieces to add dual 40 IDF carbs to my Signature Manx. I had the carbs rebuilt/set up by ACE, so they are ready. I need to get linkage and air cleaners. My question is about body and linkage clearance. If you are running dual IDFs can you share your set up? I have straight manifolds now but am worried that the CB Performance cross bar linkage will hit the body on the right side. CB sells off set manifolds - would they provide more clearance? I was originally going to use CSP linkage, but ACE set up the carb with the CB Weblink that moves the carb arm, so I would like to run a stout crossbar linkage. Sharing your experience with Webers and Manx bodies (especially Siggy) would be greatly appreciated.

Siggymanx33 · Post by **Siggymanx33** » Mon Aug 18, 2008 3:21 pm

Don, I have had everything ready to do the switch myself, however I haven't had the time nor willingness to risk prime buggying season should something not go as planned. I have freshly rebuilt 44s and from what I gather, (with the Siggy) you are going to need to use the lower type 3 manifolds as well as the CSP linkage. As you may know, the back of the Siggy hangs a few inches lower than the original Manxes. I have everything purchased, just need to do the switch. I'll be doing it shortly after labor day.

mstokes · Post by **mstokes** » Mon Aug 18, 2008 5:13 pm

Don, I installed dual Weber 48's on my original Manx without any problem. I purchased everything as a kit with "Tayco linkage" (whoever that is). No Weblink. The linkage is not top of the line. Its a simple chrome plated crossbar and one of the mounting plates is offset to align with the opposite side. I hope this helps Mike

GotManx · Post by **GotManx** » Mon Aug 18, 2008 5:13 pm

When I first put my Siggy together, I had dual 40 Dellortos on it. I was using the offset manifolds and a C.B. style cross bar linkage. The linkage was real close to the body and I had it adjusted down a little bit so that it wouldn't rub. With the offset manifolds there was no problem with clearance of the carbs or the standard aircleaners, it was just tight at the linkage arms. The CSP linkage with definitely solve that problem.

Siggymanx33 · Post by **Siggymanx33** » Mon Aug 18, 2008 5:56 pm

I will be using the weblink with the CSP Linkage. Does anyone know why you can't link to specific pages if your reading through the main website? This should help a bit. http://www.manxclub.com/forum/showthrea ... ers+siggys

Don Giovanoni · Post by **Don Giovanoni** » Tue Aug 19, 2008 1:57 am

Thanks to everyone that answered, you are all a great resource! Jon, when you say tight with the linkage arms, did that mean you got it to work ok but it was just real close? [QUOTE=GotManx;12953]When I first put my Siggy together, I had dual 40 Dellortos on it. I was using the offset manifolds and a C.B. style cross bar linkage. The linkage was real close to the body and I had it adjusted down a little bit so that it wouldn't rub. With the offset manifolds there was no problem with clearance of the carbs or the standard aircleaners, it was just tight at the linkage arms. The CSP linkage with definitely solve that problem.[/QUOTE]

TMc2548 · Post by **TMc2548** » Tue Aug 19, 2008 4:16 am

When I first installed my IDF's I had issues with the crossbar linkage hitting the rear apron. I've since switched to a CSP bellcrank linkage and love the fit. I tried installing a weblink but I do not like the way it fit or operated.

GotManx · Post by **GotManx** » Tue Aug 19, 2008 5:10 pm

[QUOTE="Don Giovanoni;12960"]Jon, when you say tight with the linkage arms, did that mean you got it to work ok but it was just real close?[/QUOTE] I had to use shorter threaded shafts for the hiem joints so the angle of the arm off the crossbar was angled slightly down. The arm was pretty close to the fiberglass, but everything worked fine.

Don Giovanoni · Post by **Don Giovanoni** » Wed Aug 20, 2008 12:57 am

Thanks Dave, Jon, Tom, and Mike! Learning from each other will save all of us grief and bucks. The "shrinkage" of the rear apron on the Siggy has provided a few challenges...

Siggymanx33 · Post by **Siggymanx33** » Mon Aug 17, 2009 1:58 am

I was hoping that we could revisit this..... I am trying to put Weber 44's on my Siggy. I thought I was ahead of the curve be using type 3 manifolds and the csp linkage. turns out it doesn't work because I don't have clearance at the cylinder tin. http://i190.photobucket.com/albums/z271 ... y09001.jpg

I would like to know if I need offset manifolds or if someone sells something in between stock IDF and the type 3 shorty? If im reading the above properly, I should be ordering the offset manifolds?

TMc2548 · Post by **TMc2548** » Mon Aug 17, 2009 2:08 am

You could "persuade" the tin with a ball pien hammer to make room for the linkage.

Don Giovanoni · Post by **Don Giovanoni** » Mon Aug 17, 2009 3:44 am

I am familiar with the situation as I have been going through this myself. I can't speak of how manifolds/carbs will fit with your body; mine is a Siggy with even a little less rear clearance than the original Manx. I ordered the CB Performance offset manifold set. These ultimately fit but were a real pain. First, they were so big at the base that there was no way they would clear the original tin, I had to grind them down on the inside to get them to fit. Once on, the air cleaners fit but missed the body by about a tenth of an inch. Other problems - I couldn't fit the carbs on the intakes before installing them as there is not enough room to fit the ignition wires through the manifolds with the carbs on. Also, once on, there is no way to tighten the carb nuts as there is not enough clearance between the tin and the carbs. There was no way the cross bar linkage would clear the body so I went with the CSP linkage as well. Very happy with the CSP linkage - I also added the optional return spring. Just this weekend I changed out the CB manifolds with some used Weber manifolds. They are not offset but are spaced further out from the tin and are almost an inch lower than the CB manifolds, allowing a little more room. They are a dream to work with, can be installed and the carbs installed or removed without removing the manifolds. The CSP linkage barely reached the carbs but I was able to make it work. Good luck with your manifold selection. Don

Siggymanx33 · Post by **Siggymanx33** » Mon Aug 17, 2009 1:42 pm

Don, I am working with a Siggy too, I appreciate the response. Would you happen to have a link of the manifolds that you bought? (If you bought them online) Also, what size air filters are you using? Did you need the optional return spring or did it make it that much better? Thank you!

mstokes · Post by **mstokes** » Mon Aug 17, 2009 9:15 pm

I have dual weber 48's on my Manx. I have had no problem with clearance. I bought a kit from Moore's with short manifolds and I have plenty of room. I will send photo's

mstokes · Post by **mstokes** » Mon Aug 17, 2009 9:27 pm

here are the photo's i promised

Manx Club

Siggy Manx and dual IDF Carbs

Siggy Manx and dual IDF Carbs

Thanks Everyone!

My Experience

photo's