Common rail vs mechanical injection

[Jstpssng]

When it’s that cold I don’t care to start either.

 

[RickB]

So the -40 claim is unverified? Thanks.

 

[RickB]

When it’s that cold I don’t care to start either.

No doubt.

 

[CausticUrbanCoast]

5.9L Cummins Grid Heater Delete Information

Information regarding the purpose and operation of the heater grid on the 5.9L and 6.7L Cummins diesel, including the pros and cons of deleting the grid heater in favor of increased performance potential.

www.dieselhub.com

If extra time for the grid to superheat the intake air to 284F is unaided or that diesel antigel for winter is unaided.

Then I guess the heated garage and hot block starts are unaided too?

Those grid heaters are great for killing batteries where it gets cold. Almost 2kW at over 200A for 30 seconds is always a good time.

I am fairly sure you are better off using your block heater, then at least you still have a chance to start when the grid melts its power relay. Or at least extending its life somewhat.

 

[Hay Dude]

When it’s that cold I don’t care to start either.

No doubt and I’m glad I will never have to try.
Abuse and Cruelty to diesels!

 

[Hay Dude]

So the -40 claim is unverified? Thanks.

Yes,,,,but -35 IS verified and that’s pretty impressive!

 

[Fielding]

After -45C cummins really need to get plugged in or you are staying home.

I do not plug mine in unless its -20c. Synthetic oil is worth every penny.

 

[Hay Dude]

After -45C cummins really need to get plugged in or you are staying home.

I do not plug mine in unless its -20c. Synthetic oil is worth every penny.

Impressive video. Thanks for showing another reason to love my Cummins diesels.

 

[Fielding]

Its the reason I started loving cummins, a coworker on a pipeline job was starting his at -25C not plugged in….. but no grid heater, he did not realize you had to wait to start, he would just turn the key past. I figured if the engine lasted as long as it did with no special treatment and no repairs, that was the engine to get. Fleet trucks get fleet abuse unfortunately.

We also had another guy trip the Positive Air Shutoff at highway speed. Truck still lives.

 

[LouNY]

While they may well start unaided at those temperatures why be that rough on an engine.
Plug the poor thing in for an hour or two, get the frost out of the block.
The grid heaters and hi pressure common rail systems are good cold weather starters.
My little eco-diesel always amazed me at how good it would start in cold.
Of course the additives and blended fuel that the engines are fed with at those temperatures helps abit also.
But if possible I plugged all my diesels in for cold weather starts, they sound and behave so much better.
Those that don't wish too that's your business just don't tell me it's not needed because it may not be necessary.

 

[Boss 302]

Absolutely, plug it in that's what the block heater is there for.

 

[Hay Dude]

I think 99% of us know they’re supposed to be plugged in when very cold.
Fielding was trying to demostrate the rugged durability of Cummins Diesels.

 

[CausticUrbanCoast]

I think 99% of us know they’re supposed to be plugged in when very cold.
Fielding was trying to demostrate the rugged durability of Cummins Diesels.

Only in north America

 

[RoostersGarage]

I live in the south so we don't really get cold weather but I plug mine in when it's 20 or below. That's about the time the 15w-40 gets thick and the cranking slows down. That's generally like 15 times or less. The grid heater crapped out as the head gasket was getting swapped so I just deleted it.

 

[Jstpssng]

Even in a gas engine, a block heater will help cold startups in lower temps. No engine likes running metal on metal until the oil becomes fluid.

OTOH engines are generally the last thing to go up here, lasting long after the frame has rotted away to nothing.

 

[Smokeydog]

1996 dodge Cummins mechanical FI. Few times starting cold without preheat engine immediately starts. Just a little more white smoke. Think in the manual it mentions preheating for less smoke not as starting aid.

 

[RickB]

1996 dodge Cummins mechanical FI. Few times starting cold without preheat engine immediately starts. Just a little more white smoke. Think in the manual it mentions preheating for less smoke not as starting aid.

Who would accept that any preheating would not be a starting aid simply because of an error of omission or outright stupidity on the part of the editor of the manual?

 

[Boss 302]

Plug it in and it helps to shorten the time it takes to make heat for the cab.

 

[90cummins]

In the 80’s & 90’s I worked in engineering on the development of the hydro mechanical transmission in the Bradley fighting vehicle. We had 4 test cells with 600hp Cummins vt903 diesels as the power source for the transmission’s. The test schedule was 6 hours long and was repeated for 440 hours.
One test point required us to run at rated speed & hp for 10 minutes 2600 rpm/1212 torque. We found that doing a hot shut down from 50% to 100% of full load would cause piston scoring and ultimately failure sometime in a dramatic way with pistons, rod & block material scattered about the room. The cure was a five minute cool down prior to shut down. If the engine was stalled unexpectedly during a full power run the engine had to be immediately restarted or left to cool for 30 minutes to avoid piston scoring. We never had a turbo failure in spite of running them at red heat for hours.
A proper shut down is essential to long life.

Gas engines run hotter than diesels turbo or non turbo.
I went cross country with a Volvo XC60 2.0 liter turbo/supercharged engine rated 300hp & 300 lb/ft torque towing an enclosed trailer with my BMW in it.
I ran 70/80 mph across & back with no issues but I also didn’t shut it down hot.

90cummins

 

[Smokeydog]

Who would accept that any preheating would not be a starting aid simply because of an error of omission or outright stupidity on the part of the editor of the manual?

The grid heater is for emissions control as much as a starting aid. Same engine used in many other applications without a grid heater that have to operate in cold weather.

Grid heater begins operating below 60*F. Some speculate cold starting aid doesn’t become beneficial till below 0*F. Rarely see those temps. I have to be careful if I use the truck for short trips on the farm not allowing enough time charge the batteries back.
Always been a quick starter and reliable engine in 25 years of ownership. Only real problem being a weak fuel shutoff solenoid used in the Dodge application. Easily upgraded.