Fuel milage I can expect from 3406E
Looking at buying and old Jevic truck. 1999 FLD with a 3406E Cat, 10 speed, 3.70 rears and 22.5 LP. Plan on driving this truck 60-62 mph which will put me just above 1400 rpms. Anyone have any experience with these motors that can tell me what kind of fuel milage I can expect. Will be pulling vans a reefers mostly from Iowa to Pa.
The 3406E was a very reliable engine and the fuel mileage, when tuned right, can be pretty decent. I've got the exact same truck/specs except with a Detroit Series 60.
I would absolutely recommend a FASS system and Pittsburgh power balancer/damper for that 3406E. The Crankshafts weren't balanced as well as some others, and for some reason, the transfer pumps like to suck in small amounts of air. The 3406E is easy to work on. I would rather have the 3406E than an N-14 Cummins.
I've never owned one myself, but have worked on TONS of them. I cant give you exact fuel mileage numbers, and don't want to throw any guesses out there. I try to stick to facts. Any maintenance questions on that engine, please let me know.
I am currently running a 1998 W900 with a 3406E (475) & a super 10,3.70 rear ratio. I have removed the external breathers and went with a t-600 unit,fleet air filter,pittsbur
Have a 550hp 3406e 18speed. run 65-68 mph. 9 car auto hauler. new inframe and I'm getting little under 6mpg. I was getting 6.15-6.25 before inframe. ceramic coated intakes exhaust, pittsburg power mufflers, ECM is turned up and tuned. Oversized turbo. super single tires. These motors burn head gaskets 5-6 cyl. also had exhaust sleeves go through turbo , over 600k I would replace them. 750k a lot of inframes get done on these motors. Higher torque motors vs detroits. That 10 speed is the draw back to me. It might not be that bad till you get into PA. Reg setup you should get 6.5-7 if you can drive.
I have a 1998 3406E (550 hp) in Volvo 770 with a Super 13 speed tranny, 3.36 gears and 455/55R22.5 X-One Energy Drive Tires.
I averaged 9.2 mpg in January and 9.05 mpg in February driving 57 mph.
I highly recommend replacing the stock exhaust manifold and turbo with the Pittsburgh Power ported/polished exhaust manifold with larger turbo including blanket and exhaust wrap that picked my fuel mileage up 6/10ths with that change alone.
I also have the PP Box, PP Balancer/dampne
I highly recommend MicroBlue treatment on wheel bearings, tranny and rear ends to pick up between 1.7 to 2.0 mpg. Well worth the investment.
The Cat 3406E motor is a better fuel mileage motor than it is given credit for once the crappy stock exhaust design and small turbo is replaced with the PP ones.
Cat Cummins Detroit . Might as well argue chevy foRd dodge. I currently own a 5EK 435 3406E and spent five years prior to that working on caterpillar engines. In my humble opinion it is one of the best truck engines ever made. They do everything well. You can't beat the drive ability of this engine. While fuel economy may not be comparable to a 12.7. Properly set up and driven you will be pleasantly surprised even though many people will tell you it's awful for economy. The people who complain are your typicall operators that want to run classic style trucks seventry MPh everywhere. Common issues are head gaskets due to liner protrusion . This however is not a rule and if fixed properly will not be an issue. It's not uncommon to go a million plus miles until pitting on the liners finally takes its toll. Absolutely do a damper balancer turbo and manifold !
The 3406E is a fantastic engine that's in need of an aerodynamic body. On a Volvo WIA I used to haul hopper bottoms it frequently got between 5 and 7 MPG with a lifetime average over 6. A WIA would have been considered advanced in 1994 but aerodynamics have improved greatly between then and now.
If you were to put it in a Cascadia glider or a 386 I'm sure you could see 7.5 MPG or more in a dry van operation.
On an FLD I would expect roughly 6.5 to 7.