65 S2 Silencer Mounts Where?

[Rodnok]

I'm in the process of completing a restoration/rebuild of a Seven basket case that I had purchased several years ago and was being restored by the seller. Much work had been done but no completion date was in sight so I picked it up this spring and hope to finish it up before the end of the year. It has a new factory paneled chassis and I finally took a leap of faith and cut the hole for the exhaust header. I was terrified but it turned out pretty well. Now I need to mount the silencer. There are a couple of mounting flanges on the can, but I have no idea what to mount it to. I don't like the idea of drilling into a frame tube to install riv-nuts but no other option is jumping out at me. I could easily put a couple of riv-nuts into the aluminum cladding, but the silencer is fairly heavy and would subject the thin aluminum to significant stresses. Unfortunately, I have never seen a complete S2 Seven in real life, found no clues in Tony Weal's book and find myself in need of knowledgeable support.

[SENC]

I'll be over in my shop this morning and grab a few photos for you, if someone else doesn't best me to it.

[Joe Petty]

Yeah, that's quite a thrill cutting that exhaust header hole in the nice fresh aluminum!

I recall mocking up the header with a coat hanger wire to see where to first cut and ten making 5 or 6 larger and larger cuts to get the pipes through with minimal "damage".

 

My frame was drilled horizontally through the bottom square tube in 2 places in the left side floorboard.

Just a hole through the frame, no welded sleeve or other reinforcement.

The aluminum is close to the side of the frame at the bottom, and I don't recall needing to fabricate any spacers to keep from pulling the aluminum against the frame.

Bolt from the inside through the frame holds the "vibration isolating" mount and the stud holds the muffler.

 

The rear brackets for the front clamshell fenders attach at the front of the foot well and those bolts use sleeves to keep from pulling the aluminum against the frame. 

 

Good Luck!

[SENC]

A few pictures of the attachm

ent on mine. Through the aluminum skin, frame, and inside skin.

 

Rear

 

 

Front

 

 

Hex/Allen key bolt heads inside.

 

As I recall, when I removed mine, the nuts were tack welded to the exhaust bracket.  After removing those during cleanup, I replaced them with jet-style nuts.

[Rodnok]

Thank you SENC and Joe Petty, Pictures help immeasurably. When I'm unsure as to which to way to go I tend to overthink things and then they get complicated. I need to keep "Simplify" foremost in my thoughts and actions!