Datsun Roadster Forum-311s.org

JT68 wrote: Sun Oct 29, 2023 8:05 pm There really isn’t a good reason to delete the passages on a street car. In the winter it warms the manifold and intake charge; in the summer it cools it (exhaust temp is way,way hotter than coolant temp).

On track cars you can get away with it because they are operating at wide open throttle most the time and for relatively short durations. The high airflow rate keeps things fairly cool.

Since street cars spend most of the time at much lower airflow, if you delete the intake cooling, everything gets much hotter in the summer which causes problems. The cars also take longer much longer to warm up in cold temps.

Overall, for street cars, it is much better to leave the intake coolant flow intact. Suggest you use the original intake.

Gregs672000 wrote: Mon Oct 30, 2023 11:00 am Mine were filled many years ago (done by a machine shop at my request) however, though I've had no known problems here in WA State weather, I agree with JT. So yes, it can be done, but unless you need to because the original is bad, I wouldn't just to run a newer part. Maybe a racer who runs SUs would want it.

Gregs672000 wrote: Wed Nov 01, 2023 12:13 pm I don't have any before and after data to say if the intake charge is hotter or cooler post water elimination. However, I can say something about heat. I have a ceramic coated header that also has a Heat Shield Products wrap material applied to the upper half of the header (not traditional header wrap, much better and does not cause damage). I do NOT have the traditional Solex heat shielding in place as it had cracked and in general has always made intake system installation a battle. Even with the ceramic coating and the wrap my throttle bodies were still hot to the touch, so I fabricated another heat shield from a thin sheet of aluminum with an added stick-on heat shielding product applied to it that screws onto the body and fits up under the TBs/intake manifold... wow, what a difference. They barely get warm now... I was more than pleased with this result, and it is easy to remove my shield and have access to all the manifold nuts. I can't say how something like this would work for other cars as I use velocity stacks with Ram Aire foam filters and not a stock air cleaner system so I don't know how well a shield would fit otherwise, but that's my experience.
I added a pic where you can see the shield and other methods I use to bring in cooler air. Understand that I have not been shy about cutting holes or moving things, and I DO NOT have a heater in the car though I think it would be easy to route water to one without the intake manifold being in the mix. Hope this is helpful to someone.
20220502_170703_copy_1632x1224.jpg
If anyone is wondering, I now use the empty and sealed water chamber in the manifold as a manifold pressure source that's plumbed into the Microsquirt ECU for my MAP sensor. EFI wasn't even a thought when I filled the water ports but it worked out perfect many years later