d89 Presents: How Long Should I Run My Block Heater? - Page 3 - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #25 of 27 (permalink) Old 01-08-2020, 10:22 AM
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Originally Posted by dauntless89 View Post
I am making this a sticky due to popular request.

A lot has happened in the last year. To bring everyone up to speed, I didn't get my old engine (12v 5.9) done in time to do any thermal studies on it last winter. The truck ended up sitting most of the summer as well and I didn't get a chance to actually fire it up until mid-August. The cam failed almost immediately and trashed the cam tunnel. My options being what they were, I opted to start from scratch and build a P-pumped 6.7 12v. The CR blocks use only the thread-in style of block heater (also found on the 12v and 24v STORM blocks) and due to the internal geometry of the block casting, the freeze-plug style heaters are a no-go on the 6.7. I did choose to thread the coolant freeze plugs on the driver's side of the block, and there's a possibility I can get a second thread-in heater in one of those ports, but most likely I won't be able to retain dual heaters.

When I built the Hamilton 12v head for the original motor, I moved the custom temp sensor port out of the coolant tube and into the front of the head, close to the thermostat. This will eliminate the false-low readings, and because I'm using this 12v Hamilton head again on the new engine, I'll still be able to experiment with selectively blocking the vent hose like I was talking about to keep heat in the engine.

I've got most of the big pieces of this build, just waiting on a crank to get back from balancing and then I can start putting it together. I'm planning to have the engine done and in the truck by Thanksgiving. Even with the predictable amount of snafus, I should have plenty of time this winter to play with the thermal imager.
Kinda wondering IF the heated coolant ever heats up the oil to any significance ( very cold weather )

Id like to think ? wish it does , but i remember one time it was pretty ignorant out and i put my hand on the oil pan .... it was cold. lol.

carry on ...


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post #26 of 27 (permalink) Old 02-17-2020, 11:30 AM Thread Starter
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Quote:
Originally Posted by dauntless89 View Post
I've got most of the big pieces of this build, just waiting on a crank to get back from balancing and then I can start putting it together. I'm planning to have the engine done and in the truck by Thanksgiving. Even with the predictable amount of snafus, I should have plenty of time this winter to play with the thermal imager.

It never ceases to amaze me how I manage to jinx myself every time I open my mouth. Snafu after snafu has resulted in the engine just getting set onto the mounts last weekend. Currently working on turbos and bending new injection lines. I also have a potential instrumentation headache and it'll be another couple weeks until I can fire it and break the cam in. It's still getting into the teens at night but it's normal to see 45-50+ during the day, so I don't know that I'll be able to produce any good thermal data this season. We'll see.


To answer your question, the warmed coolant never interacts with the oil until the engine is started. Sump temps will only get a few degrees above ambient (if that) from whatever thermal conduction can occur through the pan itself. Once the engine is started, heat immediately travels out of the coolant and into the oil through the oil cooler. It wasn't uncommon to see coolant temps drop ~30 degrees within the first minute of starting the engine.
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post #27 of 27 (permalink) Old Yesterday, 04:07 PM
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Thanks for posting this information. As I will most likely NEVER plug my truck in here in Central Florida, it's good to read and understand this stuff. We do like to travel, especially when the seasons change in other parts of the country. This info may come in handy for me somewhere down the road. I wish you the best of luck on your build dauntless89.

Chris
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