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Greetings! What you describe is quite common on most boats , but perhaps more evident in metal (steel / aluminium) hulls. (Ulysses had to be tied to the main mast of his boat to prevent him from getting enchanted by the songs of the sirens *) (*) today we know that the songs of the "sirens"...

Thanks to all for the interesting info. Out of business due to toe surgery a while ago. I'll do my best to reply to all tomorrow! Nurse is pissed off she will take phone away!

There are no baffles in these exchangers (nor where in the original casted aluminium ones). When fabricating the SS version, I copied as good as possible the original parts. By then I only had driven the boat just to get it on the hard. The previous owner was a jerk so he probably did not...

According to Transaxial´s information I made the following calculations: 1 sq foot every 3 to 5 HP (taking the worst scenario I will calculate 3 HP/Ft). 1 sq foot is 0.09 sq meters. My engines are rated @ 120 HP. 1 meter 2" pipe has an external surface of 0.17 sq meters. So 120 HP / 0.17 = 40...

The info you provide is really valuable to me. My engines are 5.7 liter. I sail the Rio de la Plata / Uruguay River / Parana River basins (there is also a large delta in-between these rivers). Raw water temperature ranges from 15ºC during (short winters), reaching 25 to 30ºC in summer. Now that...

your thinking is 100% correct. from the rear top end water flows trough a goose neck hose into a vertical SS cylinder / chamber That contains a sort of snorkel (to prevent water flowing int engine). There it gets mixed with exhaust gases prior to leaving via the 6´´ exhaust hose I prime / purge...

The coolant gets in at the front / bottom and leaves at the back / top trough the goose neck hose seen in the picture

Thanks for the explanation. Of course I am familiar with pyrometers, but did´nt know they were used for monitoring combustion (great application though) I will see if I can get required info from engine in order to built one in

Here are some pictures showing the completely clogged original heat exchanger (Aluminium), which also had some cracks and how the new one looked.

I agree with you: The cruising speed of this boat is 7.5 Knt @ 1800 RPM. And my brain is set to that speed :thumb: If I increase RPM´s up to 2500 ... fuel consumption skyrockets, while speed increases perhaps in 2 Knt (can´t recall exact figure right now) No idea on how EGT gauges info is...

Bedford 350 6 straight + Cooling Syetem HI there, I just found some images from the new cooling water tray I made to replace the corroded original which was casted aluminium. I built it in 304 SS in two halves: the inferior half contains the exhaust manifold and a "U" shaped radiator for...

My boat is in a German rowing and Yachtclub, so it will get a NEIN NEIN !

I got the idea and agree with you on applying a "scientific method" to diagnose the problem and find a solution. Unfortunately due to a surgery on my toe next Friday, this may have to be delayed for some weeks. I will be around as soon as my doctor sets me free.

Hi, sorry for the late reply. a lot has happened since. I have the feeling the props are ok or slightly under - propped. Nevertheless I will have this checked as well when on the hard quite soon.

Hi David, I will do this quite soon. So far, one engine is still down because gaskets were not delivered on time, on the other hand, walking around barefooted I broke / displaced mi right index finger toe and will have it straightened by means of a nail. Surgery is on Friday. Will be out tied to...

Good advise thak you!

Those engines were V8 and a complete nightmare for GM, for many years: The ones I am talking about are real indestructible workhorses !

Hi! you are right: these Bedford are straight sixes originally developed in the UK and later on mass produced in many counties. General Motors of Argentina used this engine (as it was designed) in 5 Ton trucks during the mid 60´s and later increased HP and performance by making a number of...

Very interesting! If I had to choose, I also would have gone for inverted "C" channels welded to the hull.... but it is too late for that (high risk of fire). I will start gather as much info as possible and when getting the boat on the hard (quite soon) I will flip a coin and decide the way to go.

Thanks a lot for your comment! and Yes, the boats name is great: When I bought it, it had a stupid name (put together using the two first letters of the previous owner´s children... or so), as the boat had been neglected for a quite long time it was a real mess: nothing worked, everything was...

Hi David! Just called the exhaust manifold gasket manufacturer (they are custom made) and there is a delay in the manufacturing.... may be next week. So I will spend the weekend doing some painting maintenanace and having some good SIESTAS !

Unfortunately this is not an option. High risk of burning boat down!

Lote of interesting information in your post. Thank you!. I had in mind to make the keel cooler using thin wall steel tubing as used in heating systems. It may not be as efficient as copper, but it is way cheaper, less electrolysis issues... and it will last longer than I will live!

The boat is 40 years old. The first owner passed away. The second is a jerk....:banghead:

Right!