exhaust differences

[LC_BOTT]

Any one know of any specific differences? last week I painted a few sets of spare exhausts I have, and noticed the early thin flange set weigh much less than some later pipes, (not cut open or gutted either) and they also have '4L0' cast into the flange as well (never noticed that before)

I've looked on Xavier's site but nothing noted that I could find, that mentioned internals apart from the extra holes. Possibly not many have the original exhaust still?

rd350lc.net/pageEXHAUST.htm

[steve63]

I have an early 250 set but no later ones to compare them with only some F2 ones I cut the silencers off, put a flange on and made a pair of stainless end cans for.

I know the later 4L0 pipes had reinforced collars around the flange end as well as the much thicker flanges but I wouldn't have though the weight difference was enough to be obvious when handling them.

Maybe a very skilled proddy racer/sheet metal worker took the mesh out and welded them up well enough so you can't tell?

Maybe some have a lot more carbon build up on the mesh?

I can't see either of those being the case to be honest so they could have changed the internals or even thickness of the metal along the way.

I told my mates that I could feel the weight difference between the standards and the Allspeeds when riding my LC. I'm sure they must be near to half the weight. I think they thought I was just full of sh@t.

[LC_BOTT]

Just weighed one, and it was approx 7.2-lb, will find a later one and weigh that when I can, just to see if I'm not going mad.
See if the pic works

[reedpete]

Never seen 4L0 on a flange before….and by looking at the non factory weld, I’m wondering if that’s has a little bit of a story all of its own.

Are you absolutely sure it’s not been opened up and all the sound deadening mesh removed? That was a classic proddy mod back in the day. More expansion chamber, less weight..

Alternatively I suppose there’s an outside possibility that is a pre production pipe or something.

[shaunthe2nd]

Last ones I decoked I got at least 1kg of carbon out of each pipe. Could feel the difference.

[midlifecrisisrd]

That's what I was going to suggest

The carbon and gunge soon adds up

Steve

[LC_BOTT]

You could be right about the carbon, but I usually blast it out with a heatgun before painting. Got several of these, and the above one has been badly welded as that was what the recall was for, the others are 'as new' with no cuts in the pipe section, (but with a few battle scars) will scrutinise tomorrow when the paints cured.
Also found the 4l0 flange fitted to 250 pipe with the green paint splash on the hanger. Gonna check which type of NOS one I have now.