Another closed cooling question.
I tired getting this figured out earlier but still have questions.
Thermostat bypass. It looks like water will still flow to the water pump to prevent cavitation. So can I eliminate the bypass line from the thermostat housing to the water pump? Merc keeps this place for either open or closed cooling but it may be more for convenience in building vs real need. Pics https://cimg9.ibsrv.net/gimg/www.off...bdc69cb48.jpeg Incoming from below thermostat. This goes into the flow toward the circulation pump. https://cimg0.ibsrv.net/gimg/www.off...6612f4d29.jpeg Necessary? It would appear the same function is handled by the set up below. https://cimg5.ibsrv.net/gimg/www.off...20239eb52.jpeg Showing connection from below thermostat to connection on heat exchanger. I need to make some final decisions on this. I’d really like to close off the second bypass. My brain says it will work but I still question why Merc did it this way. I really wish none of it was needed really. |
Sorry to beat this to death but I think I figured it out. I did a lot of picture searching on the site and found some really good pics of an install done by VinnyP from back in the day. I'll hook up the bypass at the thermostat to the heat exchanger, and plug the circulation pump bypass. A temp sender will go in the thermostat housing with the alarm sender installed in one of the ports on the manifold.
I'm almost done with these things! |
Originally Posted by TomZ
(Post 4790971)
Sorry to beat this to death but I think I figured it out. I did a lot of picture searching on the site and found some really good pics of an install done by VinnyP from back in the day. I'll hook up the bypass at the thermostat to the heat exchanger, and plug the circulation pump bypass. A temp sender will go in the thermostat housing with the alarm sender installed in one of the ports on the manifold.
I'm almost done with these things! |
Well, now I'm confused. I know I have that hose going up but Now that I'm thinking about it I think it goes into another Barb fitting on the intake manifold.....
https://cimg5.ibsrv.net/gimg/www.off...bf845438f.jpeg |
a question for seafordguy......how much hp can your closed cooling handle?......been looking for a full CC system for my 572's roughly NA 650 hp a piece.....sorry for the hy jack.
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Originally Posted by scippy
(Post 4791004)
a question for seafordguy......how much hp can your closed cooling handle?......been looking for a full CC system for my 572's roughly NA 650 hp a piece.....sorry for the hy jack.
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Originally Posted by seafordguy
(Post 4790991)
Well, now I'm confused. I know I have that hose going up but Now that I'm thinking about it I think it goes into another Barb fitting on the intake manifold.....
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Originally Posted by TomZ
(Post 4791057)
Eric, Merc appeared to double-down on the bypass routing. I'm thinking it had more to do with design flexibility than need because the connection from the manifold to the circulation pump does the same thing as the connection going from Merc's special bypass thermostat housing to the inlet of the circulation pump. The bypass on yours is done at the intake manifold/circulation pump connection I'd think.
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Thanks Dave. I eliminated the bypass on mine. In fact, I might even plug the nipple on the heat exchanger and use thermostats with a couple 3/16 holes drilled to allow coolant to pass during warmup. I haven’t quite made up my mind on that, but that’s the way I’m leaning.
Are you cooling the block only or block and manifolds? And what’s considering running hot? I’m going to target 150 (140 stat) but it will end up being where it ends up being. My MPIs ran 175 even when it was 100 degrees out (but raw water cooled). I don’t mind some heat but I’m starting out conservatively because of them being 454/502 coolers in a 600 hp application. |
Originally Posted by TomZ
(Post 4791188)
Thanks Dave. I eliminated the bypass on mine. In fact, I might even plug the nipple on the heat exchanger and use thermostats with a couple 3/16 holes drilled to allow coolant to pass during warmup. I haven’t quite made up my mind on that, but that’s the way I’m leaning.
Are you cooling the block only or block and manifolds? And what’s considering running hot? I’m going to target 150 (140 stat) but it will end up being where it ends up being. My MPIs ran 175 even when it was 100 degrees out (but raw water cooled). I don’t mind some heat but I’m starting out conservatively because of them being 454/502 coolers in a 600 hp application. Mine is the full cooling system. Block and manifolds. I don't mind a little heat either, but it was holding just short of 210 degrees. Something isn't right. I'm going to use the laser thermometer today and see if I can find it that way. Everything is a pretty tight fit so it's tough seeing what's what. https://cimg8.ibsrv.net/gimg/www.off...e900427096.jpg https://cimg1.ibsrv.net/gimg/www.off...5b6d900037.jpg |
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