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SVTPerformance's Chain of Restaurants
Road Side Pub
"Genuine Ford" part= trash. A rant
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<blockquote data-quote="SecondhandSnake" data-source="post: 16637386" data-attributes="member: 116684"><p>Man we would get our ass beat if we didn't design for those kind of conditions plus margin. Not to say it doesn't happen at certain OEMs, but rule of thumb is it's usually designed for above and beyond what it will see. Plus the surge tank is on the cold side of the radiator, and ECT is measured at engine out. Radiator out is usually 10-15F cooler than reported ECT.</p><p></p><p></p><p></p><p>It has to be pressurized as that's critical to its function. That volume of air in there acts as a spring and keeps a more constant pressure on the water pump inlet, preventing cavitation.</p><p></p><p></p><p></p><p>It's a pretty common thing in the industry- victims of a "cost reduction" project. Either someone is looking to get noticed by management or they even get solicited directly by a Chinese supplier that says they can make it at a fraction of the cost. Everything goes well for the couple prototype units they furnish. Patting each other's backs over the cost savings. And then a year or so later they wonder why there's dozens upon dozens of failures in the field.</p><p></p><p></p><p>That's one of the reasons I seldom buy OEM. If you buy from their tier I supplier, it's usually a little better- less likely to be cost reduced and without the insane markup that happens internally to pad every divisions margins. And of course, you can usually go with something more robust than the OEM design for the same price. OEMs aren't infallible.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 16637386, member: 116684"] Man we would get our ass beat if we didn't design for those kind of conditions plus margin. Not to say it doesn't happen at certain OEMs, but rule of thumb is it's usually designed for above and beyond what it will see. Plus the surge tank is on the cold side of the radiator, and ECT is measured at engine out. Radiator out is usually 10-15F cooler than reported ECT. It has to be pressurized as that's critical to its function. That volume of air in there acts as a spring and keeps a more constant pressure on the water pump inlet, preventing cavitation. It's a pretty common thing in the industry- victims of a "cost reduction" project. Either someone is looking to get noticed by management or they even get solicited directly by a Chinese supplier that says they can make it at a fraction of the cost. Everything goes well for the couple prototype units they furnish. Patting each other's backs over the cost savings. And then a year or so later they wonder why there's dozens upon dozens of failures in the field. That's one of the reasons I seldom buy OEM. If you buy from their tier I supplier, it's usually a little better- less likely to be cost reduced and without the insane markup that happens internally to pad every divisions margins. And of course, you can usually go with something more robust than the OEM design for the same price. OEMs aren't infallible. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
"Genuine Ford" part= trash. A rant
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