hot diesel

[SenorEye]

Is anyone else concerned about injecting hot diesel folowing a purge?

My temp gauge on the return side of my ip reads between 50 and 70 c for maybe 15 minutes following a purge (depending on driving speed) The pump is a big hot mass that is only/mainly cooled by the diesel, so clearly is a lot of hot diesel being injected during each purge.

I always make sure I have biodiesel in the tank, or at least stanadyne in my diesel tank for added lubricity and try to minimize how often I purge -
any thoughts?

[dana linscott]

The use of a lubricity enhancer for purge diesel is one I urge (and use) myself.

IPs tend to run at or near block temp and are designed to do so for long periods. Higher temps than this may cause excessive wear on VO or diesel.

Originally Posted by SenorEye

Is anyone else concerned about injecting hot diesel folowing a purge?

My temp gauge on the return side of my ip reads between 50 and 70 c for maybe 15 minutes following a purge (depending on driving speed) The pump is a big hot mass that is only/mainly cooled by the diesel, so clearly is a lot of hot diesel being injected during each purge.

I always make sure I have biodiesel in the tank, or at least stanadyne in my diesel tank for added lubricity and try to minimize how often I purge -
any thoughts?

[4dantheman]

Dana,

"IPs tend to run at or near block temp and are designed to do so for long periods."

I'm not sure that I agree with this statement. What data do you base this conclusion on? How do you substantiate this claim?

[Bobc]

Why exactly would you need lubricity enhancers for purge diesel?Also what temperature would you think IP's operate at being bolted to the block????

I'm sure they're designed to run at that temp for long periods of time,

Bob

[SenorEye]

I have read that diesel looses lubricity when heated. I dont know at what temperature, or how much it looses, hence my question.

I have yet to ever see my VW IP temperature greater than 35 degrees while running on diesel. When I switch to VO, the IP temperature rises to approximately between 70 and 80, the temp of the vo within 5 minutes.

after a purge, my feed diesel is room temperature, and my return diesel is ~75 degrees for 10 minutes, and is still 50 degrees 20 minutes after purge.

[Bobc]

I don't have an IP on my PSD but I have to admit I wondered about the temp thing because I have a mechanical fuel pump I'd hate to ruin because of high fuel temps.I know the diesel sitting in the fuel rails has to be in excess of 160 degrees F just due to the fact it is sitting in a hot engine.

Bob

[4dantheman]

Looks like they finally see the light. Altho I was hoping to find a response from Dana.

Indeed, one of the functions related to the lubricity of diesel is temperature. The HIGHER the temp of diesel the LOWER the lubricity!!

If one were to buy into the premise "IPs tend to run at or near block temp and are designed to do so for long periods." then that would put the temp of the diesel in the IP at about the same temp. Since some IP,s are lubricated by diesel, this premise simply doesn't stand up. IP's may be attached to the block, but not for the entire surface area of the IP.

Thermostats in most cars are the 80 degree C (180 degrees F) variety. That would mean block temperature would be at least coolant temperature. I'm thinkin block temperature is higher than coolant temp. Plus you have thermal mass to take into consideration.

If this premise were true, how is it that I can place my hands on the IP in my car (not a Dodge truck) & leave them on the IP after driving around for an hour? I certainly can't leave my hands on the radiator hose or valve cover. Why??? Because my IP does not run at or near block temperature.

If this premise were true, why does Chrysler warrant the chip on their turbo Cummins IP to withstand a max temp of 150 degrees F? Remember, this is a max temp. My guess is that their IP runs cooler that the max temp they warrant their chip for.

If this premise were true, why would fattywagons market their injector line heater product? They market this product because, chime in here class, IP's don't run at or near block temperatures.

The success of using SVO/WVO to fuel a diesel is a function of the temperature of the SVO/WVO being used. There exists a "window" in which this temperature needs to be. If it is too cold, things don't work well. If it is too hot, again, things don't work well.

I converted to run on WVO a couple of years ago. I recognized right off the bat that my conversion would be a continuing work in progress as other people came on board and technology was developed; there is more than one way to skin a cat & I'm not the sharpest knife in the drawer.

I don't have any fattywagons prodts as part of my system. I recently discovered their site & am interested in their injection line heater. I can see that this prdt has merit & addresses an issue hitherto not taken into consideration by me.

However, I do have some issues with this prdt & have questions concerning it. I've e-mailed them but have yet to receive a response.

[SenorEye]

I have to modify my last post. With closer monitoring, my IP does heat up under diesel under certain situations.
Under normal driving - say an hour or four on the highway, it is a temperature that I can touch - slightly warm and my engine runs at ~190f

This past weekend, I ended up climbing three steep dirt road mountain passes in freezing air temps. On all three occasions, my ip did heat up due to the increased load on the engine - ie higher engine temps of around 205f. the ip heated to about 120f. (granted that my radiator was completly blocked off). when I uncovered the grill, It droped and hovered around 100f on the steep climb.

looking only at engine temps, I would have never guessed that there would be such a large range of temps in the ip.

[Tim-HJ61]

4dantheman,

My Nippondenso Injection Pump on my 12HT HJ61 Landcruiser is at block temperature after normal running. Can't hold my hand on it for long, same at the fuel filter just above it.

Yours isn't. Mine is.

Tim

[tigman]

In light of have lost 2 IP's, I have been monitoring closely the incoming fuel temp, the return fuel temp, and I have a sensor mounted to the lower side of my IP... Dana is correct the IP even in COLD temps is at or near the temp of the block continually, but there is a distinct difference in temp of incoming fuel between WVO and Diesel, mine only mix in about 8" of line and the temp drops rapidly when switched from WVO to diesel, while the IP looses very little temp 10-15 degrees then regains that temp if i continue to drive!! Tigman