Series 60 -- 11.0 or 12.7 any opinions?

[Sebulba]

Hello,

Continuing my search for a D3 and I noticed that there is an 11.1 CI and a 12.7 CI Series 60 engine.

Any opinions on them.  Are they equally reliable, engineering, etc., or is one of them to be avoided?

Thanks a million

Seb

[thomasinnv]

Both are great engines. I have had both in a 45' DL3. For a 40 footer an 11.1 would be fine if you find a bus that you just really can't pass up, otherwise look for the 12.7 it's a much nicer driving experience. Try to get a pre egr engine. The 11.1 is usually up to around 350hp and 1150 tq, there were a few reflashed to 365 and 1250tq i believe. The 12.7 can be up to 470hp and 1550 tq with a factory flash, or higher if you find someone who is willing to tinker with it for you. Most coaches with 11.1 would have shipped with it set at 330/350 and the 12.7 anywhere from 370 to 430. Fuel mileage is going to be similar on both engines. I picked up about 1mpg when I swapped the 11.1 out with the 12.7.

Just my two cents, do with it what you will.

[DoubleEagle]

12.7L, one of the best engines of all time, up there with the CAT 3406. Have the bull gear bearing play checked.

[luvrbus]

Both are good engines ,the early 12.7 had a problems with the bull gear around 600,000 miles and  with the center bore  (liners)would sink and they would have a lot of blow by and exhaust into the radiator  check for a gray color in the coolant   

[belfert]

The local Detroit dealer was able to re-flash my 11.1 to 400 HP.  I never noticed any change after that was done compared to the 350 HP it came with.

I would much prefer a 12.7 from just before EGR.

[luvrbus]

Higher hp setting does not always change the torque setting like they say HP starts you rolling and torque keeps you rolling

[chessie4905]

just find one with the 12.7. Eliminates woulda, coulda, shoulda, later.

[6805eagleguy]

Get a pre 2000 12.7L with no egr. Mine is 430hp 1600 tq. Series 60s are absolute torque monsters

We have a 11.1 L in a crane factory set at 300 hp, 1800tq🙂

[luvrbus]

Get a pre 2000 12.7L with no egr. Mine is 430hp 1600 tq. Series 60s are absolute torque monsters

We have a 11.1 L in a crane factory set at 300 hp, 1800tq🙂

I am at 2050 ft lbs steep grades mean nothing to it

[Sebulba]

Both are great engines. I have had both in a 45' DL3. For a 40 footer an 11.1 would be fine if you find a bus that you just really can't pass up, otherwise look for the 12.7 it's a much nicer driving experience. Try to get a pre egr engine. The 11.1 is usually up to around 350hp and 1150 tq, there were a few reflashed to 365 and 1250tq i believe. The 12.7 can be up to 470hp and 1550 tq with a factory flash, or higher if you find someone who is willing to tinker with it for you. Most coaches with 11.1 would have shipped with it set at 330/350 and the 12.7 anywhere from 370 to 430. Fuel mileage is going to be similar on both engines. I picked up about 1mpg when I swapped the 11.1 out with the 12.7.

Just my two cents, do with it what you will.

Great, thanks, this is what I was looking for.

Thanks

Seb

[Sebulba]

12.7L, one of the best engines of all time, up there with the CAT 3406. Have the bull gear bearing play checked.

Thanks

Seb

[Sebulba]

To everyone who responded, thank you.

I'm guessing that anything older than 2000 is pre EGR?

Seb

[sledhead]

2003 was the 1st year for the start of emission crap

dave

[Glennman]

2003 was the 1st year for the start of emission crap

So it looks like I lucked out with my 12.7 being 2002 (no EGR crap)? I've found a date of manufacture to be August of 2001.

[6805eagleguy]

I thought it 2000 . Maybe I am wrong. My engine is a dec '99 manufacture date!