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Full FWC sys on VP 350 Gi using Merc parts

J

jon_allen

Regular Contributor
"Hi Guys'
Has anyone ever

"Hi Guys'
Has anyone ever converted a 5.7 Gi to full FWC by using Mercruiser parts? I can't find a kit to supply the manifolds with FW, only the block. I think I might be able to make it work with Merc manifolds. What do you think?

Thanks, Jon Allen"
 
"A full system,mans and block,

"A full system,mans and block, requires a larger heat exchanger and larger sea water pump flow. You say you have a 5.7GI...as in Volvo 5.7GI? If so then the crank mounted sea water pump will support a full system but you will not find one as Merc does not do a full system for thier 5.7s. We may have a FWC kit that will do what you want but I need to know if this is a Volvo set-up,the year,if it is a straight inboard or an I/O application and if it has power steering.You may e-mail me direct [email protected]"
 
"You are correct in that the V

"You are correct in that the Volvo Penta exhaust manifolds were not intended to be included in the Closed System loop.
If you were to use the Merc manifolds, you may possibly have Riser-to-Y pipe alignment issues. You may be able to make things align....I am not sure, as I have not done this!

Now, you used the word "Converted", so may I assume that this is a retro-fit?

If so, there is an issue that you may not be considering or aware of:

**Converting a previously Raw Water Cooled engine to a Closed Cooling system poses the risk of potential water jacket "rust scale" and Heat Exchanger contamination!

The rust scale that will eventually come loose (certainly not over night), will settle in/around the outside of tube bundle and eventually hinder the H/E's abiltiy to remove heat from the engine coolant! Again, it won't happen over-night.... but keep an eye on this.

Unfortunately, this side of the H/E's tube bundle is inaccessible by the average Joe!

So, a prior engine chemical flushing and neutralizing of the block/heads may be a good start!
A serviceable screen system of some sort in the coolant return path would be another good thing.

Believe me, I'm all for the Closed Cooling systems! I will not own a marine engine without! Just don't want you to have trouble with yours.

."
 
"Robert, for quite a few model

"Robert, for quite a few models, it was the exhaust manifold in/out ports that were considered too small for a Closed System coolant flow capability, as I understand this.
That, and no available man/riser block off plates.
The kit that you show perhaps includes these???
I did not see them!

."
 
"Hi Gang,
This motor would&#3

"Hi Gang,
This motor would'nt be converted as is. A repl long block is in the works. I really would like a full FWC sys. as the boat is in salt water tied to a mooring for 6 mos. Why V/P does'nt offer a full sys. is beyond me. This motor has a belt driven sea water pump.

Thanks Again,
Jon Allen"
 
"John, honestly.... I'd do

"John, honestly.... I'd do the half system and not try to re-design the system. This way you are not mixing/matching manifolds, etc.
You will still get a fair amount of life from your exhaust mans.
Risers??..... it makes little difference.

Go to Martec's site and look at some of the SJE kits.
http://www.martec.se/html/V112.pdf

Don't forget that you stat temp rating will now change for the Closed Cooling system."
 
"re: "That, and no availab

"re: "That, and no available man/riser block off plates.
The kit that you show perhaps includes these???
I did not see them! "
The picture shown is for the partial kit. The full kit includes the gaskets. Then again these parts are manifold dependent.."
 
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