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Intake manifold inlet

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Old Jun 5, 2018 | 04:34 PM
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Intake manifold inlet


Does anyone know the purpose of the extended tube on the water inlet on the intake manifold. Ive attached a picture for reference. The tube extends beyond the threaded section and ends up deeper into the intake. Its strange and would cause more machining or processing of a part vs just using a brass pipe, so there must be a reason behind the design.

Any theories?
 
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Old Jun 5, 2018 | 09:53 PM
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If the inlet opening is close to the casting it would act as a filter, not letting stuff large enough to clog to pass.
 
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Old Jun 5, 2018 | 10:01 PM
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Also, since it's the feed for the heater, it likely pulls hotter coolant from the bottom surface of the supply area.
As well, there may be some siphoning effect going on.
Not sure about any of that of course. Just conjecture. But they've been that way for a long time and the engineers almost always had a good reason for doing strange things!

Paul
 
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Old Jun 6, 2018 | 12:17 AM
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True or not, these both make good enough sense to me. Thank you both .
 
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Old Jun 6, 2018 | 01:12 AM
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Hah! Yeah, making up engineering sounding stuff can be fun!
All I know for sure is that the siphon tube thingy rusts out really quickly!

Hey, maybe it's made of zinc? Hmm, I wonder...
If it is, then it's also a sacrificial anode!
Cool. Another guess to add to the list.

Paul
 
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Old Jun 6, 2018 | 09:13 AM
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Ooooh, I don't know if the original was zinc, but I'll be looking for one that is.
 
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