Do they still make 2-stroke diesels?

Question

Like the old 6-71 detroit diesels, or from any company?

Answer 1

You can still buy a 53, 71 or 92 series 2 cycle Detroit diesel for boat and industrial use. They come in anything from 3-16 cylinders.

The problems they had in trucks was:

1. They needed high RPM to develop HP (21-2300 RPM vs 15-1800 for the newer 4 cycle) Lower RPM= better fuel mileage. (My old 8V92 got 4 MPG on a good day vs 8 + MPG with my
C-12 Cat.)

2. A heavy truck runs on torque, which 2 cycles didn't have. My 8V92 had 1350 ft/lbs vs the 1550 ft/lbsin my C-12. (an example: the 8V92 dropped 5-6 gears on the climb out of L.A. on I-15 Cajon Pass while at the same weight, my Cat drops usually 1 and at most 2 gears. Faster to the top = less fuel used.

3. The power band was very narrow on a 2 cycle, needing many gears to keep the power in the 18-2100 RPM range vs 11-1650 RPM power band in the newer engines.

4. The 2 cycle smoked!! The newer engines don't. The black smoke was mostly carbon and water, but it looked nasty and people screamed "pollution"!

5. Longevity was a problem with 2 cycles. 500,000 miles was a long time between overhauls vs a millon + on the newer ones. (If they are taken care of!)

6. Weight and physical size was a problem. They needed larger blocks for proper cooling and thus were much larger and heavier than the newer engines. (smaller = shorter and more sloped hoods for better aerodynamics and thus better fuel mileage and lighter = more cargo can be carried and better fuel mileage.)

Answer 2

Dont know but They were soooooo cool! It would be nice to have a modern 2 stroke diesel In a American truck or car,(and set it up to run on waste cooking oil)

Answer 3

NO!
The primary reasons are---
1) Emissions
2) Noise emissions