Coolant flow mods.
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Junior User
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Coolant flow mods.
I noticed that the coolant passages between my block (D9TE) and heads (D3VE) were mostly fairly large triangles but there are a few that are just round holes about 1/4 inch diameter. These smaller passages are on the exhaust side which I would have thought should have an increased flow than the intake side. Before I get crazy with my drill and enlarge them, has anyone ever noticed this before or made any modifications along these lines.
A search on "coolant passages" didn't mention anything about the size of these holes. Any thoughts?
A search on "coolant passages" didn't mention anything about the size of these holes. Any thoughts?
Senior User
Joined: Jan 2006
Posts: 292
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From: Fort Worth,Texas
Before I got crazey with a drill I would look at the size of the holes in the headgasket. Do they match or are they smaller to restrict flow in certin areas. You may spend time opening up holes in the head and block that have bilt in restriction in the headgasket. On the outher hand I don't think it would hurt to clean up aney casting flash that might be blocking water flow.
Good luck
Bill
Good luck
Bill
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Junior User
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The gasket holes at that point are triangular so it would be pretty easy to get more flow. I thought I'd check to see if anyone new about any complex scheme that used restrictive passages to even out the temperatures within the heads and block. I know......I know, it probably isn't that complicated but automotive engineers are from a different planet and their designs may not be quite as they appear.
Thanks for the input Bill......anyone else?
Thanks for the input Bill......anyone else?
Post Fiend
Joined: Jul 2003
Posts: 11,945
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From: Spokane, WA
I have no definite answers for you one way or the other on the size of the passages in the heads. That being said, my experience with coolant is that you don't want it to flow too fast. Obviously too slow isn't a good thing either but when it circulates too fast it doesn't draw enough heat off the engine. When I went to a rear mount radiator with a high flow electric pump I actually had to slow down the coolant flow via a ball valve for proper cooling. So in my non-professional opinion, I would say there's no need to bother with the passages for increased flow. They tend to move plenty of coolant as is at a rate for mantaining a proper operating temperature.
Just my .02 cents.
Just my .02 cents.
Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
First off they are bleed holes and you DON'T want to open them up. If you do you may well end up with a overheat problem. The coolant is suppose to flow from the bottom of the radiator to the water pump into the front of the block then to the rear of the block, then up into the heads and forward to the front outlets into the intake and over to the thermostat, then back to the radiator. The blead hole are to makesure no air gets trapped to cause a problem.
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