There has been a problem for a long time putting smoke on an engine running canister mufflers.

With stainless steel headers there is no real good place to install a smoke fitting. Some canisters come with a smoke inlet fitting, but when you introduce the smoke oil into the muffler you've lost a lot of the heat that makes the oil smoke, and from what I understand it can develop into a gooey mess inside the muffler.

I asked a machinist friend to make up some 3/8" thick aluminum flanges that are the shape of the exhaust port, we did it for the TOC-53/TMM-106 and also for DA-50 size ports.

Now, here is the embarrassing part. Somebody called me a couple days ago and I told him about this and he wanted one. The problem is he caught me while I was on my way somewhere and I failed to write it down. I have no idea who it was.

So if the guy who asked for a smoke flange reads this, please call me back.

TF

Tom,

What causes the stainless steel header not to be a good place to install the smoke fitting?

The walls are very thin, the fitting will almost certainly strip out in very short order.

TF

So the cure might be to weld a boss on the outside of the can that will accept threading?

If you inject the oil into the canister you don't get the high heat levels that you get at the exhaust port, that's the whole point of this thread.

TF

Sorry, I meant the pipe....

So what's harder, finding someone to TIG weld a plate onto paper-thin stainless steel or bolting a flange in between the geader and the exhaust port?

TF

I'll take the flange any day. I have a few of them 1/2" thick for some mufflers when they don't drop far enough to clear a firewall. Keeping the smoke inlet closer to the the exhaust port by having the inlet in the spacer/flange does produce better smoke than having the inlet farther out on the extended muffler. Bisson mufflers makes them for various versions of their muffler products. Drilled and tapped for a fitting.