What size jump starter do you need for a 6.7L diesel engine?
A 6.7L diesel engine (the Cummins in Ram heavy duty trucks and the Ford Power Stroke) needs roughly 818 cranking amps at freezing and about 1145 at 0 F. Choose a jump starter its maker rates for at least 7.7L diesel, typically a 4,000 peak amp class unit or larger.
5,000A peak / 10L gas / 8L diesel
Rated by its maker for 10L gas and 8L diesel, which covers a 6.7L diesel engine with margin, the closest-sized match among the units that do, so you are not paying for capacity you will not use.
How many cranking amps does a 6.7L diesel need by temperature?
Estimated from displacement: 6.7L is about 409 cubic inches, and a diesel engine draws roughly two amps per cubic inch at freezing. Cold raises the load because the oil thickens, while it also cuts what the battery and the pack can deliver.
| Outside temperature | Cranking amps needed |
|---|---|
| 80 F | 613 A |
| 32 F | 818 A |
| 0 F | 1145 A |
| -20 F | 1472 A |
Which jump starters are rated for a 6.7L diesel engine?
19 units in our verified catalog state an engine rating of at least 7.7L diesel. The table lists the ten whose ratings sit closest to this engine, with the ratings exactly as each maker states them.
| Model | Peak | Gas rating | Diesel rating | Price |
|---|---|---|---|---|
| TREKURE Car Battery Jumper Starter Portable 5000A | 5,000A | 10L | 8L | $49.99 |
| Povasee Jump Starter 5000A Car Jumper Starter | 5,000A | 10L | 8L | $59.98 |
| HPBS H50 Jump Starter - 5000A Jump Starter Battery Pack | 5,000A | 10L | 8L | $59.99 |
| HPBS 5000A Jump Starter with Air Compressor | 5,000A | 10L | 8L | $69.98 |
| AstroAI P10 12V 5000A Lithium Car Jump Starter Up to 10L | 5,000A | 10L | 8L | $69.99 |
| TREKURE Portable Car Jump Starter with Air Compressor | 7,000A | 9L | 8L | $69.99 |
| Car Battery Jumper Starter Portable 5000A | 5,000A | 10L | 8L | $79.99 |
| JOLTEKON Car Battery Jump Starter with Air Compressor 45 | 4,500A | 9L | 8L | $99.99 |
| AUTOONE Car Jump Starter 6000A Battery Booster | 6,000A | all gas | 10L | $50.56 |
| WOLFBOX 4000A Jump Starter | 4,000A | 10L | 10L | $119.99 |
What else matters besides amps?
- Clamp and cable quality. Thick cables and solid clamps deliver the current the pack is rated for; thin ones waste it as heat.
- Safety protections. Reverse-polarity and spark protection stop a wrong connection from doing damage.
- Cold performance. Lithium packs lose output when cold. For a diesel in winter, keep the pack indoors until you need it.
- Extras. A built-in air compressor saves carrying a separate inflator, at the cost of weight.
More jump starters for a 6.7L diesel engine
Ratings are as stated by each maker. Prices change often.
AUTOONE Car Jump Starter 6000A Battery Booster, Portable Battery Pack for All Gas 10L...6,000A peak / 10L diesel$50.56Check price on Amazon
160PSI Jump Starter with Air Compressor, 12V Car Battery Jump Starter Power Bank(All...12L diesel / 160 PSI / air compressor$59.99Check price on Amazon
Jump Starter with Air Compressor, BRPOM 8000A Portable Car Jump Starter (All Petrol/12L...8,000A peak / 12L diesel / 160 PSI / air compressor$62.99Check price on Amazon
TREKURE Portable Car Jump Starter with Air Compressor, 150PSI 7000A Car Battery Jump...7,000A peak / 9L gas / 8L diesel / 150 PSI / air compressor$69.99Check price on Amazon
TREKURE Car Battery Jump Starter 8000A 26800mAh, Portable Car Jump Starter for All Gas...8,000A peak / 12L diesel / 26,800mAh$89.99Check price on Amazon
8000A Car Battery Jump Starter, Battery Jumper Starter Portable (All Gas/12L Diesel)...8,000A peak / 12L diesel / 27,000mAh$99.99Check price on Amazon
Other engine sizes
Frequently asked questions
How many amps does it take to start a 6.7L diesel?
About 818 cranking amps at 32 F, rising to roughly 1145 at 0 F and 1472 at -20 F. Diesels need about twice the current of a gas engine of the same size because of their high compression, and cold oil adds more. A jump pack needs margin over this because a flat battery absorbs some of its current.
Will a 4,000 amp jump starter start a 6.7L diesel?
Usually, if the maker rates that unit for at least 7.7L diesel. Peak amp figures are not measured to one standard, so check the engine-size rating in the listing rather than the amp number. Every product on this page states a rating that covers a 6.7L diesel engine with margin.
Can I use a jump starter rated for a smaller engine?
It may work on a warm day with a battery that is only slightly low, but it is likely to fail exactly when you need it: in the cold, or with a battery that is completely flat. Buy for your engine size with at least 15 percent margin, and more if you live somewhere with hard winters.