martanke Posted January 22 Report Share Posted January 22 I'm rebuilding the straight 8 Chrysler Royal marine engine in my boat, using a 1950 industrial IND-12 block as base. It's pretty much identical to the C49 block. I'm a litlle confused about the hole placements in my new water distribution tube. Laying it on top of the engine I had expected the holes to align with the exhaust valves. But as seen in the attached pictures they don't. The hole spacing is the same as the exhaust valve spacing but they seem to be offset. If I line up the holes perfectly with the valves the tube won't fit inside. Is this the way it's supposed to be or should I open the holes to improve coolant flow towards the valves? Thanks Quote Link to comment Share on other sites More sharing options...
Sniper Posted January 22 Report Share Posted January 22 I suspect the offset is there because if it was directly aimed at the valve center line it would be obstructed by the valve pocket casting. I suspect the offset is to allow the coolant to flow around the valve pocket casting , carrying off the heat and then unto the water outlet and ultimately the radiator. 1 Quote Link to comment Share on other sites More sharing options...
Sam Buchanan Posted January 22 Report Share Posted January 22 That will be one cool sounding boat! The little Suzuki on my little ZIP runabout would run and hide....... ? Quote Link to comment Share on other sites More sharing options...
martanke Posted January 23 Author Report Share Posted January 23 That's a beautiful boat though! 1 Quote Link to comment Share on other sites More sharing options...
Ivan_B Posted January 23 Report Share Posted January 23 (edited) If you look at the same pipe for the in-line 6 engine, you will notice exactly the same configuration of the openings. I suspect that the openings are not aimed directly onto the exhaust valves, but are rather evenly spaced-out throughout the block to provide more even coolant circulation to the working engine in general. Later: actually, the above assumption might be incorrect, since the engine diagrams seem to show the openings directly where the valves are ? Edited January 23 by Ivan_B Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted January 23 Report Share Posted January 23 Tomorrow I can post a picture of an original factory water tube if you like? Quote Link to comment Share on other sites More sharing options...
martanke Posted January 23 Author Report Share Posted January 23 21 hours ago, Sniper said: I suspect the offset is there because if it was directly aimed at the valve center line it would be obstructed by the valve pocket casting. I suspect the offset is to allow the coolant to flow around the valve pocket casting , carrying off the heat and then unto the water outlet and ultimately the radiator. Maybe that is it. Quote Link to comment Share on other sites More sharing options...
martanke Posted January 23 Author Report Share Posted January 23 1 hour ago, Dodgeb4ya said: Tomorrow I can post a picture of an original factory water tube if you like? Yes please do! Quote Link to comment Share on other sites More sharing options...
Tired iron Posted January 24 Report Share Posted January 24 I used to own a seamule pusher tug with a pair of straight eight Royals in it. Great motors. I sent you a pm cause i've got lots of extra parts. Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted January 25 Report Share Posted January 25 Here is a picture of a tube out of a 1946-50 eight with mrasurements to the center line of each cooling slot...the arrows point to each exact measurement center line. Quote Link to comment Share on other sites More sharing options...
martanke Posted January 25 Author Report Share Posted January 25 2 hours ago, Dodgeb4ya said: Here is a picture of a tube out of a 1946-50 eight with mrasurements to the center line of each cooling slot...the arrows point to each exact measurement center line. Thanks! I will compare with my tube over the weekend. 1 Quote Link to comment Share on other sites More sharing options...
martanke Posted January 29 Author Report Share Posted January 29 The slots in my tube line up well with the measurements of the original one. So all good! 1 Quote Link to comment Share on other sites More sharing options...
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