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Author Topic: Homemade bigbore silencer  (Read 296 times)

Online The norm

Homemade bigbore silencer
« on: August 14, 2019, 12:21:09 AM »
I made a silencer a few years ago for my Hybrid Engineering 310. I learned a few things in the process that I put to use on the silencer for the 391cc engine that Pete put together for me.  The first thing I learned was the core should not be welded to the stinger or the end cap.
Second thing is the stinger and turn down bot should be welded to a "flange" that bolts to the end caps.
Third is that both ends should be removable and have "O"rings.
Fourth thing I learned is to machine a collar/sleeve for the stinger to head pipe connection instead of trying to expand the tube.

The first picture shows me machining 3/8" off the outer diameter of a piece of 4" ID aluminum conduit for the silencer body
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The next picture shows a finished end cap with the perforated core. I forgot to take a picture while machining it sorry



Then we have a picture of the silencer mocked up with both ends and the turn down....



Now this all took place months ago before I had the big motor done. I got the 391 and installed right before my last trip. I didn't have time to finish the silencer and went with the trx5 pipe and my first homemade silencer. Now fast forward to last Friday.... I decided that I must have the CPI pipe I acquired and the silencer on my R before the 250R Winchester bay meet!
So I buckled down and got it done...

« Last Edit: August 14, 2019, 12:44:44 AM by The norm »
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Online The norm

Re: Homemade bigbore silencer
« Reply #1 on: August 14, 2019, 12:39:29 AM »
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This shows the flange I wanted to have the turn down welded to.

And the flange that the stinger will weld to...
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Then mocking up the stinger...


And finally the finished product!


1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Online The norm

Re: Homemade bigbore silencer
« Reply #2 on: August 14, 2019, 12:46:12 AM »
I'm very excited to see how this combination performs this Thursday at Winchester bay with some old friends and some new friends.
See you out there,
Loren
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Offline Michael88R

Re: Homemade bigbore silencer
« Reply #3 on: August 14, 2019, 01:10:29 AM »
Nice.  Definitely like the o’ring seal.  I hate rivets that rattle loose and leak.

Offline havinnoj

Re: Homemade bigbore silencer
« Reply #4 on: August 14, 2019, 11:02:11 AM »
Sweet looking Loren!

Online Hawaiiysr

Re: Homemade bigbore silencer
« Reply #5 on: August 15, 2019, 12:16:58 PM »
the "LSS" looks great! give us a full report after the meet

Offline Tbone07

Re: Homemade bigbore silencer
« Reply #6 on: August 15, 2019, 06:18:04 PM »
Man that sure doesn't look homemade. That looks professional as hell. Well done sir.
LED Performance 350 Sphynx - XC Machine
Laeger's-Roll-GThunder-HLS-PEP-HiPer-GBC

RIP Laz

Offline broken1

Re: Homemade bigbore silencer
« Reply #7 on: August 15, 2019, 07:17:03 PM »
Man that sure doesn't look homemade. That looks professional as hell. Well done sir.

Loren does great work. Been riding on his pegs for a few years now & picking up one of his anti-vibe stems this weekend.
overkill is an often underrated achievement

Online The norm

Re: Homemade bigbore silencer
« Reply #8 on: August 15, 2019, 11:27:39 PM »
Man that sure doesn't look homemade. That looks professional as hell. Well done sir.

Loren does great work. Been riding on his pegs for a few years now & picking up one of his anti-vibe stems this weekend.

Awww shucks
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)