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By charliemccraney - 8 Years Ago
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I was just thinking, on engines that use a valley pan, and therefore the intake is not important for that seal, wouldn't it be a good idea for aftermarket intakes to be cast in a way that provides an air gap between the coolant passage, and the front runners? It looks like it would be a reasonably easy thing to do with a Y intake and it would help to keep the intake runner temperature more consistent front to back. The most significant clearance issue would be the stock oil filler and I realize that it probably would not be possible to keep it entirely separated from the front runners with a one piece design.
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By miker - 8 Years Ago
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Good thought Charlie. This is a picture of Doane Spencer's original 55 bird with the highly modified heads, although I don't know if the water passages were involved. I first saw this picture with a note that the upper and separate radiator hoses were a one off NASCAR experiment, but that link doesn't appear to be up anymore. No t-stats, and a dual opening upper tan. Goes beyond your thoughts by picking up the rear water passages also. I never did see a shot of how it cleared the dizzy on the right side.
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By charliemccraney - 8 Years Ago
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I looked at intakes for other engine, and most single plane versions do incorporate a separation between runners and coolant passages. The simplified port layout of a single plane does make that a lot easier. Many dual plane air gap style manifolds also use that.
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By DryLakesRacer - 8 Years Ago
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Certain GM engines, we are not allow to speak of, are similar as they do not allow the rear of the heads to have anyway to relieve coolant. The photo of the Doane Spenser engine does this as does most aftermarket of brand "C" by putting bosses, whether drilled or undrilled, for lines to lead forward for better cooling. If I were racing a Y-block I guarantee I would tap both of the rear holes on the cylinder heads and run lines to the front at the thermostat housing. Today it's a possibility that this might be a good idea since there are more cooling problems than in the past and we take our temp reading form that spot. It might be more accurate to take the temp reading right close to the thermo housing.
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By Ted - 8 Years Ago
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Total agreement on separating the water passages on the front of the intake manifold so that they are not in direct contact with the front intake runners. Most conventional engines only have the one runner for each bank contending with this but the Y actually has two runners on each bank in contact with the water passage. Here’s a picture of the intake on my Y which separates the front water passage from the intake ports.
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