Quick Answer

Question: What size is a stock 12-valve turbo?

The stock specs for a 12-valve Holset HX35 will vary from year to year and whether the truck was a manual or auto, but the compressor inducer will be between 54 and 56mm. While popular upgrades for common rail trucks range between 64 and 67mm, a hot street 12-valve 5.9 needs to be a bit smaller.

How much HP can a 12v handle?

The forged-steel connecting rods found in the 12-valve 5.9L (and ‘98.5-’02 24-valve engines) are of an I-beam design and capable of easily handling 800 rwhp in stock form.

Will a 24v turbo fit on a 12v?

Premium Member. they are the same turbo(HX35) between all the 12v’s and the manual 24v. the auto 24v’s are the only ones with a smaller turbo(HY35). there is no advantage to a 12v turbo on a 24v unless the 24v is an auto.

What size turbo is on a 5.9 Cummins?

The turbo features a custom profile, 64mm (actual measurement 63.5mm) billet wheel perfectly mapped to a modified compressor cover and 65mm, 10-blade turbine inside the HE531’s 9cm housing. The Cummins Stealth 64 is one of the quickest spooling turbo’s we have tested for the 5.9L Cummins.

How much HP can you get out of a 12 valve Cummins?

Though it’s quite restrictive, the factory cast-iron 12-valve cylinder head will allow you to reach 500 hp, but that aged head gasket might not live at 35-45 psi of boost.

How much HP does a 12 valve Cummins have?

The Cummins 5.9-liter 6BT 12 valve has 230 HP, 440 lb-ft of torque, and a P7100 inline injection pump right out of the box. The 12-valve is also a popular engine swap choice, powering a slew of Jeep, rat rod, muscle car, and dragster projects.

Why are 12V Cummins so good?

What made the Cummins so popular was the fact that its peak power and torque was insanely usable—in fact, the redline is only at 3,000 RPM! The 12-valve was able to get respectable fuel economy while producing torque figures never-before seen in an ordinary pickup truck.

How much power can a stock 12V handle?

While the factory 12-valve rods can handle 1,000 hp, Scheid Diesel does recommend upgraded rod bolts anytime you’re in the neighborhood of 800 hp. Scheid offers these heavy-duty 12-point rod bolts, made by ARP, which are 23% stronger than the stock fasteners.

Is 24v better than 12V Cummins?

In summary, those looking to keep things stock or modest the 24v is the better street engine. If you’re looking for extreme power and performance the older 12v Cummins engine is likely the better choice.

How much boost can a 12 valve Cummins hold?

Yes, the rule of thumb is 40-50 psi of boost, but that’s more because of the increased drive pressures associated with more boost.

Are 12V Cummins reliable?

The Cummins 12v/6BT is widely regarded as the best and most reliable diesel engine ever produced. These engines are extremely simplistic, operating with mostly mechanical components rather than complicated electronic ones. The simplicity allows for massive power potential in conjunction with ultimate reliability.

What is a 12V Cummins?

The 12-valve Cummins, officially the Cummins 6BT, is the engine at the bottom of the family tree of diesel engines (at least in pickup trucks). Its simple, straightforward design is a symbol of reliability, solid engineering and tractor-style torque.

How much HP can a 5.9 Cummins handle?

The 5.9L inline-six mill’s factory rotating assembly from ’89 to ’02 is capable of handling 800 hp (1,400 to 1,600 lb-ft of torque) without breaking a sweat, and is often pushed into four-digit territory before aftermarket rods become a consideration.

How many HP is a 5.9 Cummins?


5.9L Cummins Specs 6.7L Cummins Specs
FACTORY HORSEPOWER 325 hp (2005-2007) 350 hp (2007.5-2012), 385 hp (2013-2016)
FACTORY TORQUE 610 lb-ft (2005-2007) 650 lb-ft (2007.5-2012), 850 lb-ft (2013-2014), 865 lb-ft (2015), 900 lb-ft (2016)

How fast does a turbo spin Cummins?

The turbine in the turbocharger spins at speeds of up to 150,000 rotations per minute (rpm) that is about 30 times faster than most car engines can go. Since it is connected to the exhaust, the temperatures in the turbine are also very high.

How much is a 12V Cummins worth?

How Much Does A 12V Cummins Swap Cost? Diesel Cummins conversions can vary widely, often reaching $5,000-$10,500 each.

How fast is a stock 12 valve Cummins?

Registered. Mine is about 120 mph.

When did Cummins stop making 12 valve?

The term 2nd generation Cummins refers to Dodge diesel pickups between 1994-2002. There are two variations of the 2nd gen Cummins though. 1994-1998 trucks feature 12 valves and are very similar to the previous trucks engines.

Does a 12v Cummins have glow plugs?

Cummins engines do not have glow plugs. Instead of glow plugs, Cummins engines are equipped with a single heater grid as their heat aid. These grids are more reliable and work by heating all the heat coming into the air intake. Both the 5.9L and 6.7L Cummins engines come with a grid heat system.

What year 12v Cummins is best?

1996-1998 has the best injection pumps (perhaps ignoring the 1989-1993 VE) and stronger automatics compared to earlier years. Look at the buyers guide section in the thread below.

Is the 12 valve Cummins a V8?

1989 – 1993

The Cummins engine had been successful in agriculture implements for a few years prior, so in 1989 Cummins and Chrysler introduced the 12 valve as an alternative the the V8 gas powered Dodge. It was a hit immediately for those that wanted double the torque and a better option for fuel economy.

How many cylinders does a 12v Cummins have?

All these Cummins diesel engines are inline 6 cylinders. You can find these Cummins engines in many Dodge Ram 2500, 3500, 4500 and 5500 truck models. The original design in 1989 to 1993 started with a 5.9l VE-Rotary pump and 12 valves. These engine produced 160 horsepower (HP) and 400 foot pounds of torque (lb-ft).

How much HP can a 24 valve handle?

Most will support around 1200 hp while only having a minimal pressure drop between the inlet and outlet.

How much HP can a stock Cummins handle?

How Much Hp Can A Cummins Handle? A forged steel rod connecting ’89-02 5 was found. Cummins 9L mills are stout to say the least. They are known to handle over 1,000 horsepower at near-stock compression ratios before bending, and we’ve even seen the block split before rods failed in several engines.

How much horsepower can a stock Cummins block handle?

Stock Block: Unofficially Rated For 1500 Horsepower.

How can you tell a 12v from a 24v Cummins?

If your looking at a 94-02 with the original badges on the doors of the truck a 12v will say “cummins turbo diesel” and a 24v will say “24v cummins turbo diesel”. Also 94-97 originally came with crome door mirrors which would indicate a 12v but the 98 12v and 24v’s all came with black plastic mirrors.

How many MPG does a 24v Cummins get?

All five trucks we own average 29 MPG highway, and 24 MPG in town. Cummins 5.9L has the fuel economy, speed, and the power to pull.

Why is the 5.9 Cummins reliable?

Outside of the fuel system, the 5.9 24v is a very reliable engine. The engine internals such as the pistons, rod, and crankshaft will last a lifetime and can hold up beyond 500,000 miles. Outside of the fuel system components, you should expect to replace common items like water pumps, hoses, belts, etc.