Try locally first. You can get hands on and inspect. You don't want to be buying someone else's problem. Try a place that services them.

Good link with some info on what they are, and that cleaning is common. So getting them cleaned up from carbon clogging is a thing...and should be available. They seem to last about 80k miles.

https://www.roadwarrior-inc.com/what...-we-need-them/

There are other sizes as well, if you don't need the 1200hp cooling capacity.

Important to note, that 316L stainless is really only good for low temp salt water contact.

Heat exchangexchangem...using raw water as the cooling medium, would stay relatatively cool. The engine coolant would be gtg of course.

If hot water salt water contact if required, titanium is the preferred metal.
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304 stainless is good for fresh water lakes, but not that great for salt water, even cold.

Nice! what is the lenght/diameter of this?

Thanks T, that's great reading!.....my n/a efi 572's are just under 700 hp ...a lesser capacity than dd15 egr cooler would work...finding the right cooler(s) need a formula for that proper fitment.

I've been trying to get data on good simple formulas and rules of thumb for exchanger sizing. It's hard to do ..largely as the marine HE manufacturers don't use a BTU # for their various models.

I'm seeing putting oil coolers on that are 3"×22". Those would cool a SBC mIn coolant system. So pretty big, but if you want to run WOT continuously, you need some beefy BTU shedding systems.
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I'm trying to see if the EGR cooler housings are also 316. The cores typically are...but I've seen 304 for the housings.

Depending on costs, I was looking at 1/4" stainless tubing, and fabbing up my own. The EGRs use flat rectangular tubing, vs the round...so they have better surface area for conduction.

Keep us posted T on your move to fabricate.....I'm a Jersey ocean boater nothing would be more suitable than CC for my engines. I take it your from bc Canada?

Yeah, from Vancouver Island.
​​​​​My Formula 233 has a full system for the SBC, so I don't need to do that one, but the Cobalt will need 2 exchangers. Helps that I have lots of bilge room to remote mount.

Nice...beautiful part of the world!.... wish you were closer for a joint effort......What size engines in the Cobalt?

Yeah, there is not many go-fast boats around here.

I've got 454HOs with 420 Blowers power Arnesons.

Doing rebuilds, the blocks were frost cracked when I got it....and fresh water cooled.

Orig Owner mentioned chine walking issues, so I'm not even sure I can use all the 650HP they were making before. I'll be porting the 088 heads and doing some basic cleanup.

I'll for sure document my process here with lots of pics.

Reviving this... I read through here and it doesn't seem like anyone found a good commercially available solution. I've been looking for a closed cooling system for an 1100hp marine engine with no luck. I called Perf Pro Tech a few months ago and they no longer manufacture their solution, which would have been perfect. The DIY setups many have made here are incredible but I have no problem admitting they're outside of my skillset and I don't want to risk ruining my engine investment doing it myself. Did anyone find a good solution here, even something that can be easily retrofitted from another application?