4 Stroke Detroits

[luvrbus]

I love my 2 strokes what really gets to me every time this comes up everyone compares the 6v92 a 9 L engine to the 11 L Cummins do apples to apples and the 6v92 will hold it own with the L10 or 8.3 Cummins ,hp,torque and fuel mileage now you know lol

good luck

[TomC]

6V-92TA with 90 injectors will put out 340hp and 1000lb/ft torque. The new Cummins ISC will put out 350hp and 1000lb/ft torque.  The Cummins L10 put out around 335hp and 950lb/ft torque-so yes-they are on par with each other power wise.  But- a mechanical 4 stroke will always get better fuel mileage then a mechanical 2 stroke.  An electronic 2 stroke will get the same mileage as a mechanical 4 stroke. The electronic 4 stroke will get the best fuel mileage of all engines.  Good Luck, TomC

[RoyJ]

I think people compare a 6V92 to an L10 or ISL because they are used in the same application (as is the Series 50) - transits and light coaches, and town tractors.

The 8.3 ISC is a lighter duty engine, typically used in school buses and 5 tons. I don't think it's the same class as a 6V Detroit.

Tom, you mentioned putting an ISL in your truck. I assume that's a truck conversion, and not an OTR? I'm gonna guess that ISL can't provide the power AND duty cycle for OTR use?

[TomC]

ISB, ISC, ISL are considered medium duty engines. Typically around 50,000 miles a year.  You can use them OTR, but be ready for an overhaul in the 4-500,000 mile range.  The big block engines have 1-1.2 million miles before overhaul. Good Luck, TomC

[artvonne]

You can use them OTR, but be ready for an overhaul in the 4-500,000 mile range.  The big block engines have 1-1.2 million miles before overhaul. Good Luck, TomC

  And so, where does a two stroke fall into that category?

  And, are there any mechanical injection 4 strokes we can use?

[TomC]

Detroit 2 stroke engines (series 71 and 92) are considered heavy duty engines. Mostly will last about 500k mi between overhauls.  I've seen some 12V-71N's go over 800,000mi, but that's pushing it.  2 strokes just need more preventative maintenance and don't last as long because of the rings going over the intake ports constantly.  If the 2 strokers were available with common rail electronic fuel injection, and particulate traps, we could see them at least get to 2002 if not 2007 engine certification.  Curious how they are still being used in EMD (Electro Motive Diesel [which is now owned by Caterpillar]) and the 2 stroke design is both the most fuel efficient engine and also the largest made (for ships).

As to mechanically injected 4 stroke engines you could use-In the power range of the 6V-92TA is the excellent Caterpillar 3306TA, and the Cummins L10.  In the higher 8V-92TA horsepower range is the also excellent 3406B or C up to 425hp (400hp with jacket water aftercooler [like I'm using in my truck], and 425hp with air to air intercooler), and the Cummins NTC 855cu/in engines up to 400hp (they made both a 444hp and a twin turbo 475hp which both proved to be less than stellar engines).  These engines will also get around 500kmi before overhaul.  Good Luck, TomC

[Busted Knuckle]

"(they made both a 444hp and a twin turbo 475hp which both proved to be less than stellar engines).

   

Worst engine I EVER HAD was a 444!
 BK