6" SS EXHAUST STACK

[Kurt Horvath]

Here we are 6 weeks after our last posts on my exhaust build. I
should have some photos today rain permitting.

Some forum members brought up several points that I had not fully
considered or researched.

Some of the mods are a 90 degree turnout pipe up top, a 30 degree
miter cut with a rain visor and a drain tube on the necks bottom
inside curve of the turn out. This should keep most of the rain out.

Not being able to decide on exactly which type of exit I wanted I
have built, two types the 90 I just described and a straight stack
with a rain cap.

Yes David the same as on your JD, At least I polished it up.

If you look at your PT's exhaust it's a straight shot from the
exhaust opening straight into your motor. Systems with mufflers have
water traps and some have drains as well, small holes drilled into
the bottom of the muffler. I opted out of a muffler, for a straight
stack, so some sort of rain trap had to be created that would not
interfere with the exhaust gas flow and trap and drain rain
accumulation of any proportions. A 5" hole can accumulate a lot of
water in a daily south Florida afternoon rain, day after day sooner
or later your going to fill the block with water. According to
Detroit this is a problem. DUH!!! Detroit used the words Catastrophic
Failure several times.

This first post has a photo of the test drain trap. Look on the Home
Page for photo in Bumpersbird Album last pic. What you are looking at
is the drain section with the garden hose on full flow. 5 gallons per
min. As you can see it gets most of the flow. The section of tube on
the ground has been cut down to 6" long with a 3.5" electric exhaust
dump valve installed on a flange to open and close the water trap. At
this point it is manually operated by a rocker switch or a by a
remote key fob.

I'm working on a thermal activated switch that will close the valve
upon heating or a sensor that will open the valve if it detects water
in the trap. The surest method of operation is to open it when parked
and close it before you crank up the motor

Some of my modification will most likely raise some eyebrows, and the
commentary which when taken in the proper context may led to another
modification.

Most likely NOT a this stage, unless of course someone spots a
glaring defect or error in my build.

I'm ready to install the new pipes and go somewhere in the coach,
she's been in the barn since Aug. On the up side I have gotten
several large fix's and rebuilds done on her since I knew she would
sitting for a while.

Comments, criticism, suggestions, jokes, remarks, welcomed.

Currently this is a prototype for my coach, a direct replacement for
the 95-96 PT42's is in the works. It will be built Stainless Steel
and will be a direct bolt in application, to replace the OEM parts.



Kurt Horvath
95 PT 42
10AC