Fast warm up ideas: Oil to coolant heat exchanger

[gumby79]

I am planning to use the ehxsost from my diesel fired coolant heater (yet to be installed, got the parts gust have to finish the planning and will be out of town for 2more weeks). Problem is EGTs have been measured at 200°c witch is at or near flash point of the oil248°c.

[Stubby79]

Originally Posted by Daox

Completely correct.
This is exactly what I thought, but apparently its not really the case. Oil Pan posted a bit ago that his oil pressure doesn't drop until significantly after the coolant is at operating temperature. Temperature testing would be very interesting to see how oil temp lags behind coolant temp.

It might not be lagging behind. The oil might be as hot as the coolant when the coolant gets up to temperature. The oil might continue to heat up past that point, and it's not until it hits a higher temp that the viscosity starts dropping off noticeably. The oil has no way to shed it's heat, except through the engine itself. If you add a coolant to oil heat exchanger, your oil might never get hot enough for the oil pressure to drop much.

Whether or not there is any benefit to your oil being heated past ~200f, I wouldn't know. The downside being that it can break down at higher temps or just not give as much lubrication from having too little oil pressure.

Rather than flow the coolant through the oil pan and risk all your coolant ending up in your oil, you could always flow it around the outside of the oil pan one way or another. Not as direct, but safer.

A small electric pump could circulate coolant off of the heater core hoses. Find one meant for circulating solar hot water.

It doesn't have hot coolant flowing all the time (or often enough), but you could run oil through the cooling line that goes through the radiator meant for cooling transmission fluid. If there's any way to make that work for what you're trying to do...

[Daox]

That is a distinct possibility. I would imagine since Honda put it on nearly every fuel efficient model, that it will help fuel economy in some way. Perhaps it does help, but it also hurts? It just happen to help more than it hurts... Interesting ideas.

[Stubby79]

Originally Posted by Daox

That is a distinct possibility. I would imagine since Honda put it on nearly every fuel efficient model, that it will help fuel economy in some way. Perhaps it does help, but it also hurts? It just happen to help more than it hurts... Interesting ideas.

Do these Honda engines have oil squirters for cooling the pistons? They might be necessary on lean-burn engines, not just on high-performance ones. If so, it might be necessary to force-cool the oil to absorb all that heat the oil has taken in, lest it break down or thin out too much.

[Lemmy]

Those sandwich plates are designed to allow the oil to be cooled with the coolant, not heated. Good ones are thermostatic and won't flow any coolant until everything is up to temp.

[Daox]

If you check the link below, its called an oil warmer for the Insight:

https://www.hondapartsnow.com/genuin...2-phm-e00.html

[Lemmy]

The oil runs hotter than the coolant.

[ThermionicScott]

I thought it was pretty settled that the coolant warms up faster than the oil. Water is a much better thermal conductor than oil, and it flows through higher-temperature parts of the engine than the oil.

So that heat exchanger should get to function as both an oil warmer and an oil cooler, just at different stages.

(I'll welcome corrections if wrong.)

[Xist]

This is what Google showed me when I looked for an outlet oil warmer for the 2000 Civic HX:

Dorman 65230 Oil Drain Plug Standard M14 1 50 Head Size 17mm ...
Electronics, Cars, Fashion, Collectibles, Coupons and More | eBay › ... › Car & Truck Parts › Engines & Components › Oil Pans
Dorman 65230 Oil Drain Plug Standard M14-1.50; Head Size 17mm in eBay Motors, Parts ... 2001, Honda, Civic, GX Sedan 4-Door, 1.7L 1668CC l4 CNG SOHC .... today's Burkart Automotive represents two generations of family-owned and ..... Glade Plug-In Scented Oil Warmer Air Fresheners,; Febreze Plug-In Scented Oil ...

Strangely, it did not show the air freshener on the page of Dorman products.

[ThermionicScott]

I was searching for block heaters for my wife's Jetta, and discovered along the way that that heat exchanger is called an "oil cooler" when installed on watercooled VWs: VW Oil Cooler ::Oil Cooler: Many VW 4 Cyl. water cooled, Gas or Diesel, 83-05 - sku:15359 - - PartsPlaceInc.com