Guijs

Hello,

I am installing a JTEC incowl inverted muffler on a OS 46AX engine, and I realized that it does not have the fitting for the exhaust tubbing that should come from the tank, so common on regular mufflers.

In the OS manual they say that the tubbing from the tank should be attached to the muffler fro the system to be pressurized. Should I drill a hole on the JTEC muffler and attach the fitting? What is the correct way to install it?

52larry52

My Feedback: (1)

Yes, you will need to drill and tap a hole in the muffler body for the pressure line fitting. Du-bro sells the brass fittings in assorted inch size threads (not metric). Being non metric threads makes it easier for some modelers to have the correct tap size, 8-32, 10-32. My local hobby store in Georgia (USA) has them in stock but that's a long drive for you in Brazil Now that I see you're in Brazil, metric taps may be more common for you. Check your local hobby store or mail order supplier.

Guijs

Does the fitting should be made of brass or can I use the fitting that comes with the original muffler, and just drill and tap a hole for it?

If not, I can find the Du-bro fitting here in Brazil, that should not me a problem.

Thanks

jetmech05

You can use a small tube and solder it in. The fitting does not have to be brass

aspeed

Yes you can use the original fitting. That would be the best. It is likely a metric thread. m 3.5 would be my guess.

Guijs

I found for sale at my local store the 8/32 brass fitting and the tools to drill and tap the hole. It will be easier to do this than drill a hole and solder a brass tube (which I have), since I don't have the soldering iron for this.

Thanks for the help!