Quote:
Originally Posted by Nevadan
Head gasket holes identified. Thanks for your knowledge v8volvo.
It's very visible what the head gasket is doing to the water flow. Your issue of overheating in subzero temps is another item.
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Yes, this shows what I was talking about.
On a D24T gasket it's even more visibly pronounced in terms of the disparity of hole size from front to back. I guess on the 6cyl version the rear of the engine is even farther from the water pump, so an even more dramatic difference is needed to keep the flow uniform throughout the engine. With the 5cyl the fluid dynamics task is proportionally easier I suppose.
Interesting to also observe that the holes are larger on the intake/exhaust side of the engine, where heat transfer from the exhaust ports into the head must be something they wanted to accommodate with extra coolant circulation on that side. I would have thought on an IDI engine they would want plenty of coolant flow around the prechamber area too since I think those create a lot of heat transfer, but maybe the exhaust area is still much greater.