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Mod Motor Cooling System
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<blockquote data-quote="SlowSVT" data-source="post: 14851765" data-attributes="member: 20202"><p>Moving on to the cylinder head things get a bit more interesting. Since I'm running a Boss block with the 3.700" bore I wanted the best head gasket available since the reduced land between the bores won't seal as well as a stock bore 4.6 under big boost. I decided on a Titan copper gasket with an internal stainless steel ring imbedded around the bores and a silicone bead around the water passages. They are suppose to be rated for +30 lbs of boost if you need to seal better than that your O-ringing the block which brings it's own set of problems. Normally I don't think much about gaskets other than their ability to seal but the changes I'm making to the cooling circuit had me looking at both the stock OE 4.6 cometic gasket and the Titan gasket comparing the distribution of coolant transfer holes punched in the gaskets.</p><p></p><p>Here are both gaskets side by side</p><p></p><p>[ATTACH=full]642187[/ATTACH]</p><p></p><p>If you look closely you can see how the coolant feed holes get progressively larger toward the rear cylinders which one would expect needing to balance the cooling on the cylinders furthest away from the source of coolant. What I found interesting was the balance side-to-side between both banks of cylinders. Not only that but the openings in the Titan gasket differed from the Ford gasket. Thinking about the stock cooling circuit and seeing how the drivers side head gaskets rear passages especially on #8 were the largest opening between both gasket you can tell Ford was cognoscente of the fact there no exit path for the coolant to escape where they opened those passages the most to compensate. The passages on the Titan gasket are a little more balanced between both sides which to me means they considered the fact who ever uses these gaskets will have fitting to allow coolant to exit from the rear of both heads and this helps to even the cooling both banks of cylinder heads with a cooling mod.</p><p></p><p>This is the front section of the Titan gaskets overlaying the OE gasket and visa versa</p><p></p><p>[ATTACH=full]642188[/ATTACH]</p><p></p><p>[ATTACH=full]642189[/ATTACH]</p><p></p><p></p><p>The rear</p><p></p><p>[ATTACH=full]642190[/ATTACH]</p><p></p><p>[ATTACH=full]642191[/ATTACH]</p><p></p><p>The passages in the front and tiny where the flow would almost be nonexistent where the majority of the coolant would be traveling forward from the rear cylinders before exiting out the front of the head. I mapped out coolant opening distribution in CAD between all 4 gaskets a while ago but my computer was swapped out and the file went with it. That data provided exact numbers I will make an attempt to regenerate the CAD models but it was a bit time consuming.</p><p></p><p>Both my cylinder heads have 5/8" coolant taps that have independent feeds to the front crossover which is pretty much a 50/50 balance cooling on both sides. Most cooling mods connects the driver side to the passengers side which means both side are sharing the same line which reduces the flow out the passengers side by half! With this in mind I am considering opening-up the water passage on the passenger side Titan gasket to balance the flow 100% in both side and making it flow like the drivers side. Once I start to assemble my engine I will looking into this in more detail and make a few phone calls. Playing around with coolant distribution can be a risky thing if you are not careful. The thing is if I were to run the stock OE gasket with the factory coolant distribution and a 5/8" evenflow rear coolant tap would favor the drivers side having larger opening in the rear than the passengers side............ that's not right!</p><p></p><p>If your rebuilding your engine and you have made changes that affects the coolant flow on both cylinders take a look at the hole pattern on the rear of both gaskets as outlined on this post. I might be worth while opening up a few holes to balance the flow. Leave the front holes alone the rear is where the change took place and don't do anything radical be very conservative.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 14851765, member: 20202"] Moving on to the cylinder head things get a bit more interesting. Since I'm running a Boss block with the 3.700" bore I wanted the best head gasket available since the reduced land between the bores won't seal as well as a stock bore 4.6 under big boost. I decided on a Titan copper gasket with an internal stainless steel ring imbedded around the bores and a silicone bead around the water passages. They are suppose to be rated for +30 lbs of boost if you need to seal better than that your O-ringing the block which brings it's own set of problems. Normally I don't think much about gaskets other than their ability to seal but the changes I'm making to the cooling circuit had me looking at both the stock OE 4.6 cometic gasket and the Titan gasket comparing the distribution of coolant transfer holes punched in the gaskets. Here are both gaskets side by side [ATTACH=full]642187[/ATTACH] If you look closely you can see how the coolant feed holes get progressively larger toward the rear cylinders which one would expect needing to balance the cooling on the cylinders furthest away from the source of coolant. What I found interesting was the balance side-to-side between both banks of cylinders. Not only that but the openings in the Titan gasket differed from the Ford gasket. Thinking about the stock cooling circuit and seeing how the drivers side head gaskets rear passages especially on #8 were the largest opening between both gasket you can tell Ford was cognoscente of the fact there no exit path for the coolant to escape where they opened those passages the most to compensate. The passages on the Titan gasket are a little more balanced between both sides which to me means they considered the fact who ever uses these gaskets will have fitting to allow coolant to exit from the rear of both heads and this helps to even the cooling both banks of cylinder heads with a cooling mod. This is the front section of the Titan gaskets overlaying the OE gasket and visa versa [ATTACH=full]642188[/ATTACH] [ATTACH=full]642189[/ATTACH] The rear [ATTACH=full]642190[/ATTACH] [ATTACH=full]642191[/ATTACH] The passages in the front and tiny where the flow would almost be nonexistent where the majority of the coolant would be traveling forward from the rear cylinders before exiting out the front of the head. I mapped out coolant opening distribution in CAD between all 4 gaskets a while ago but my computer was swapped out and the file went with it. That data provided exact numbers I will make an attempt to regenerate the CAD models but it was a bit time consuming. Both my cylinder heads have 5/8" coolant taps that have independent feeds to the front crossover which is pretty much a 50/50 balance cooling on both sides. Most cooling mods connects the driver side to the passengers side which means both side are sharing the same line which reduces the flow out the passengers side by half! With this in mind I am considering opening-up the water passage on the passenger side Titan gasket to balance the flow 100% in both side and making it flow like the drivers side. Once I start to assemble my engine I will looking into this in more detail and make a few phone calls. Playing around with coolant distribution can be a risky thing if you are not careful. The thing is if I were to run the stock OE gasket with the factory coolant distribution and a 5/8" evenflow rear coolant tap would favor the drivers side having larger opening in the rear than the passengers side............ that's not right! If your rebuilding your engine and you have made changes that affects the coolant flow on both cylinders take a look at the hole pattern on the rear of both gaskets as outlined on this post. I might be worth while opening up a few holes to balance the flow. Leave the front holes alone the rear is where the change took place and don't do anything radical be very conservative. [/QUOTE]
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