Expansion Chambers

jbird_710 · Post by **jbird_710** » November 17th, 2007, 7:04 pm

Sorry if this is in the wrong place; searched but couldn't find the answers.

Is it a common thing for pipes to crack where they make the 180 bend after coming out of the exhaust flange? I seem to be having this problem on my AF but not on the steel frame bikes. Is it common to one brand/model?

Also, I've always used ProCircuit pipes and never tried any others. Is there one particular brand/model that everyone prefers or is it dependent on how you want the power to come on?

Xylicon · Post by **Xylicon** » November 17th, 2007, 9:24 pm

I've always used the pro circuit pipe, never had any problems with cracking

britincali · Post by **britincali** » November 17th, 2007, 10:03 pm

Pipes are known to crack their thats why the FMF and stockers have extra meat welded in, my pro-circuit has cracked and been welded.

One of the big causes is lose or wallowed out engine mounts and the vibes.

M.F.D.B. · Post by **M.F.D.B.** » November 17th, 2007, 11:18 pm

britincali wrote:Pipes are known to crack their thats why the FMF and stockers have extra meat welded in, my pro-circuit has cracked and been welded.

One of the big causes is lose or wallowed out engine mounts and the vibes.

Yeah and worn out exhaust mounts...

jbird_710 · Post by **jbird_710** » November 18th, 2007, 2:41 am

Thanks; the PC pipe on the bike has been welded a couple of times and I found two major cracks last night when I pulled it off - one ran parallel to where it had cracked before. I've welded it up again but went ahead and ordered a new one. I noticed when pulling the pipe off, the connection to the exhast flange wasn't as tight as on my stock bike and suspect this may be part of the problem.

lewisclan · Post by **lewisclan** » November 18th, 2007, 7:51 am

I would just weld it up again we have out here and they work just fine .
what will also help is to use silicone as a bed over the exhaust flange it seals it and also helps with the vibs, we do both ends

jbird_710 · Post by **jbird_710** » November 18th, 2007, 8:28 am

lewisclan wrote:I would just weld it up again we have out here and they work just fine .
what will also help is to use silicone as a bed over the exhaust flange it seals it and also helps with the vibs, we do both ends

Thanks Jay; I used the Permatex Ultra Black the last time I worked on the stock bike and it worked out great. I'm going to use it to put this one back on today.

Post by **AlisoBob** » November 18th, 2007, 8:41 am

lewisclan wrote: What will also help is to use silicone as a bed over the exhaust flange it seals it and also helps with the vibs, we do both ends

X2

M.F.D.B. · Post by **M.F.D.B.** » November 18th, 2007, 9:42 am

AlisoBob wrote:
lewisclan wrote: What will also help is to use silicone as a bed over the exhaust flange it seals it and also helps with the vibs, we do both ends
X2

X3!!

I keep my mounts (rubber) fresh, the bolts tight, and I use ultra grey silly on both ends. Never have had a crack or a vibe problem...

99% of the time I have seen cracking problems its eitherone of 2 things. They are running way to lean, over heating the pipe or some (or all) of the mounts are missing or in bad shape.

dannygraves · Post by **dannygraves** » November 19th, 2007, 11:08 am

yup, I've never had a crack. use ultra copper on the ex flange and silencer. also good solid hangers and tight springs.

M.F.D.B. · Post by **M.F.D.B.** » November 19th, 2007, 12:43 pm

dannygraves wrote:yup, I've never had a crack. use ultra copper on the ex flange and silencer. also good solid hangers and tight springs.

Heres a tip on the springs. Go to a hobby shop that stocks Traxxis brand parts and buy the "silicone exhaust coupler". Its an 8" section of clear silicone tubing thats the perfect diameter and length for 4 exhaust springs. Putting tubing over the springs protects them from heat wekening and also quiets vibration.

dannygraves · Post by **dannygraves** » November 19th, 2007, 1:01 pm

yeah, I always used to use electrical heat shrink tubing on them.

M.F.D.B. · Post by **M.F.D.B.** » November 19th, 2007, 1:29 pm

dannygraves wrote:yeah, I always used to use electrical heat shrink tubing on them.

That would just burn off, no?? I have used rubber hose but it doesnt last long. Thats why I switched to silly...

dannygraves · Post by **dannygraves** » November 19th, 2007, 1:46 pm

the heat shrink stuff is pretty tough.

dannygraves · Post by **dannygraves** » November 19th, 2007, 1:48 pm

I only used it because my cousin does computer work for an electronics place and I went in there to help him once after hours and walked out with all sorts of goodies including the big bottles of loctite and heat shrink tubing and plenty of crimp-on connectors.

I mean...no, I totally paid for all of those items

M.F.D.B. · Post by **M.F.D.B.** » November 19th, 2007, 9:57 pm

dannygraves wrote:I only used it because my cousin does computer work for an electronics place and I went in there to help him once after hours and walked out with all sorts of goodies including the big bottles of loctite and heat shrink tubing and plenty of crimp-on connectors. I mean...no, I totally paid for all of those items

If it stands up to exhaust heat, how do you shrink it?? Blow torch?? HAHA

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Expansion Chambers

Expansion Chambers