Header drain tubes?
 

What is everyones thoughts on using overboard dumps on your headers, so they drain when the engines are tuned off? I've read pros and cons to this. Con is that the water drains out and may not allow the header to cool properly when the engines are off. Pro is obvious, if there is ever a leak, the water drains out the back of the boat, not into the the engine.

I drain not permanet as the heat probs and when start after short time again cold water will go to heatet headers.Dont like this. After the run is over real i drain then.Michaelhttps://cimg2.ibsrv.net/gimg/www.off...d01673e114.jpg

I agree, that is a good point about cold water in a hot pipe. I was thinking about adding a solenoid system, so I can just flip a switch at the end of the day, and dump the water. Are the ball valves that you have mounted on the front or the back of the header?

At the backside.I drain them in the V from underwater exhaust as i have mounted this in my boat.
At single engine no problem ti drain so.
At 2 Motors maybe an electric vent is easier.Michael

I fitted a time delay to a solenoid valve for a guy, we had a N/O 12 volt valve that was closed as soon as the ignition was switch on and the timer was set for 120 mins after ignition was switched off. Got the parts off amazon for a grand total of $60 CAD. I mounted the timer in a small plastic box and potted it, that was over five years ago and still working.

Just google timed relay and they will show up in your search.

I might be interested in that. How much would you want per kit?

And what material are the vents?
At time i found no ones that work long in saltwater!Michael

I used a setup much like this a while back but for restricting the water flow in the header to try to keep the 02 alive

Is this like a saltwater thing or something?? I'm just thinking that if you have good headers what would the point of this be other than winterizing?? Maybe I missed something :boat:

I boat in freshwater, the only reason I am thinking about this is incase a header develops a leak. If a leak develops during the season, most of the water will drain out vs draining into the engine. Outside of that, there is no point in it for me. Even then, I'm not sure there is a point in it, which is why I was asking what other do or don't do.

I gotcha...I was just confused lol...to me I wouldn't do it because in my simple mind you would just be masking a problem with this wouldn't it?? Not trying to start an argument or anything like that...just seems to me if a header was leaking it should be fixed or replaced instead of limping it along with this?? Idk maybe I'm way off base here??

I would def ad the header drains. I drained my headers after I flushed the engines every time I used the boat. If anything, its piece of mind knowing that when you turn the key after weeks of sitting, the engine isn't going to be siezed up or hydro lock from water sitting in a cylinder.

It's not for a header you know is leaking, it's an insurance policy IF a header leaks and you are not aware of it.

I agree, header leaks will happen, fresh water or salt water. Leak testing the headers is still important to do from time to time. So if you happen to spring a leak between checks and are draining them religiously, you may make it to the next leak test without engine damage. If a header leaks into the engine enough to cause hydrolock, there are a number of serious issues that could result.

My concern with an automatic drain is having a fail-safe or some kind of feedback to know water isn't draining while running the engine. I assume the easiest method is using a solenoid that normally closes the valve and only energizes to hold it open. For those that have figured this out, what solenoids are reliable? I'm interested in a time delay kit and would like to implement this winter on mine, just need to understand what the failure modes are.

I like the idea of draining just so water isn't sitting in the bottom. My issue is how can you go overboard since it is LOW in the bilge. I would have to just dump in the hull and let bilge pumps handle as I couldn't put through-hull low enough?

I totally recommend for winter storage NOT to have anti freeze or any fluid or any water in the exhaust system / headers / manifolds / risers apps. They can leak at anytime in return dumping AF into the cylinders. Had 3 last year and basically every year have a min of one.

In my area we have the craziest weather one day it can be 85 and the next day 15 degrees at any giving time during the winter months.