Copper Pipes 2.5"

Copper Pipes 2.5"

Joined: October 15th, 2007, 8:14 am

March 27th, 2018, 2:50 pm #1

Hello Everybody,
how are you doin'?

I'm still struggling to find a suitable engine / trans / V-Drive for my XK19 but I WANT to install a V-Drive for sure so I'm searching for various ancillaries.

For example I'm looking for the 2"5/8 copper pipes (nominal size 2"1/2) that run port and starboard from the bulkhead to the transom but I've found various thiknesses, which one I should buy? Type K, L or M?

Thanks a lot!!!

Marco
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Paul
Paul

April 6th, 2018, 4:30 pm #2

Hey sorry for the delay, I've been out of town and have had a lot of issues to tend to lately.

My recent use of copper in my 1966 Sea Skiff repower project used hard copper pipe that could not be bent, so I used fittings to accommplish what I needed, and the fittings were roughed up with sandpaper, flux was used, and they were sealed with sliver solder, with a safety screw of stainless steel put in to be sure they never moved out of place. I found the physical dimensions of copper available today does not match up with the dimensions Chris-Craft used in the past, so be careful if you are planning on using chrome hardware around the copper pipe at the transom because the new stuff may not fit with the old hardware. You could always use a section of exhaust hose to transition from one size to another if it was a close match.

It is my understanding that K,L,M, ACR & DWV are available in hard. K,L & ACR are available in soft.

Since the original copper exhaust on a v-drive boat is actually bent with a big curve, exiting the motor toward the front of the boat and then curving back to exit out the transom, I would think "soft" would be the best choice if you were going to have someone put a curve in one for you. The designations also have to do with thickness of the pipe, and I would probably go on the heavy side if it were me.

Good luck on that, let us know if you need any details.

regards,
Paul
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Joined: October 15th, 2007, 8:14 am

April 16th, 2018, 1:03 pm #3

Your precious advice will be useful very soon.
I think I've seen many engines use some rubber hose to accomplish the curve behind the bulkhead and it's what I'd go for, too much of a trouble finding someone to bend the pipes for me...

Last week I have received the new dashboard (Thanks Dan!), Taco aluminum rubrail, formica sheeting and I'm going to work on the boat soon...
As far as copper pipes I've found a couple of genuine trim rings for the exit on the transom that have a 2 5/8 bore, I'll have them rechromed soon...

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Thanks again and have a nice day,

Marco
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Joined: April 23rd, 2016, 11:23 am

April 28th, 2018, 8:03 pm #4

Hi Marco,
Good to hear that you are making progress.
While trying to re-create the original copper exhaust on my 23 Commander I was unable to find anyone that could bend the 3" copper tube needed for the job. I purchased standard 3" DWV plumbing pipe and like Paul I used 2- 90 degree fittings to create the 180 return bend required. The previous owner had replaced the original copper with rubber wet exhaust hose which worked but I wanted original. Interesting to note that the copper pipe and fittings cost less than the rubber hose would have.
Just to take everything to the extreme I polished the copper pipe to a mirror finish.

Craig
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