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Author Topic: Series 60 11.1 vs 12.7  (Read 7363 times)
Ericbsc
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« on: September 29, 2010, 02:09:45 PM »

  I have found a couple 11.1 ans 12.7 engines.The  11.1's are365 hp. Don't know the tourqe, but both have coolers etc. intact. I am a little concerned about the 12.7's. One looks to have taken a hard front hit on the truck with the cooled destroyed, and the other has a lot of burnt wires as it was a cab fire. Also the 11.1 is 35 % cheaper. I am going to mate with an allison 4060 in an 05 eagle.Any suggestions?
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TomC
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« Reply #1 on: September 29, 2010, 02:19:55 PM »

I believe the 11.1 liter can be bumped to 400hp and 1350lb/ft torque.  The only difference between the 11.1 and the 12.7 is the crankshaft and connecting rods (same pistons).  If you have to rebuild the 11.1, it isn't that much more to make a 12.7 out of it.  Then you can go to 500hp and 1650lb/ft torque (going to the 575hp and 1850lb/ft torque requires some expensive equipment changes).  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
luvrbus
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« Reply #2 on: September 29, 2010, 02:41:43 PM »

Eric, the 12.7 is the better of the 2 engines if you are going through the trouble go with the 12.7 the 11.1 hasn't been made since 1998 375 hp is about tops for 11.1  the 12.7 will get better fuel mileage.I never met a person with a 11.1 in bus that did not want to xchange it for a 12.7
« Last Edit: September 29, 2010, 03:05:51 PM by luvrbus » Logged

Life is short drink the good wine first
Ericbsc
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« Reply #3 on: September 29, 2010, 06:12:56 PM »

I have searched on line and have not been able to locate any info. on the 11.1, just the 12.7, and 14.
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robertglines1
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« Reply #4 on: September 29, 2010, 06:25:40 PM »

I went with the 12.7 myself basic fact cubic inches equal torque..like the difference between a 8V71 and a 8v92 except in this case I'm going from a 5mpg 8v92 to hopefully over 8 mpg 12.7..more power better gas mileage ..this is what I have gleaned from research and talking to guys that are running them..
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
belfert
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« Reply #5 on: September 29, 2010, 06:45:24 PM »

The 11.1L hasn't been made in over a decade so there probably isn't much info out there.  I would suspect most truckers went with the 12.7L anyhow.

Just as Clifford said, I would rather have a 12.7L instead of the 11.1L for more power.  Saving 20 minutes in the mountains isn't worth replacing or upgrading my engine.  Even weighing 44,000 lbs including trailer I still had no issues with too steep of grades.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
luvrbus
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« Reply #6 on: September 29, 2010, 06:50:50 PM »

Eric, if you are looking for the HP and torque rating and rpms www.dwclutch.com has the rating on all Detroit engines even the 2 strokes

good luck
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buswarrior
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« Reply #7 on: September 29, 2010, 06:53:49 PM »

For that link, click the tab marked "Proper Clutch Selection, the engine families are at the bottom of that page.

happy coaching!
buswarrior
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Frozen North, Greater Toronto Area
Ericbsc
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« Reply #8 on: September 29, 2010, 06:56:39 PM »

What transmission have you used. With the eagle length is important. The 4050 I have can be programed  as a 4 speed with double overdrive to compensate for the 3:73 rear. Way I have it figured if I go out west to flat ground and a 30 mi. straight I should top out at about 140mph in 6th gear!!! Jus kiddin!
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robertglines1
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« Reply #9 on: September 29, 2010, 07:04:20 PM »

you need to talk to Jim (RV safety man) he has a Eagle with a 60 series and a Eaton 10sp Autoshift..Can tell you the in and out's.I've learned a lot from his experience...Bob
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
Ed Brenner
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« Reply #10 on: September 29, 2010, 07:07:00 PM »

Eric,

When you pull that old 71 and that mt654cr trans out remember I'll haul the scrap away !!! Grin Grin
Be nice to have a spare trans.
Ed
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Ed Brenner
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 " While We're At It " A Busnut's most costly Phrase !!
Ericbsc
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« Reply #11 on: September 29, 2010, 07:11:29 PM »

Went to the web site. I have the info. off the engine tags. The 11.1 is a 365 hp engine with 1350 ft. lbs. The 12.7 is 430-470 with 1450 ftlbs. Not a lot of difference. The 12.7 truck has taken a hard frontal and a cab fire. The 11.1 is in good cond with rad. and cooler intact. I don't knoe the mileage on either but the 11.1 is very clean. I called the local dd shop and they were as much help as usual!!! We can get a little info. off the computer but not enough to help. Probably been changed anyway. Wish I had a job where I could treat people like SH@#, take a 2 hr. lunch, blow people off and still charhe $ 150.00 an hour. A doctor trains for over 8 years and makes less!!!! NOW I FEEL BETTER LOL!
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Ericbsc
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« Reply #12 on: September 29, 2010, 07:14:07 PM »

Also the 12.7 hp rating is at 2100 rpm, and the 11.1 at 1800. Don't know if that matters? Ed Come on up and handle this swap and it could be christmas!! LOL
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luvrbus
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« Reply #13 on: September 29, 2010, 07:26:09 PM »

I can do as good or better than a 11.1 with a 400 hp 8v92 and get the same fuel mileage,Bob we have tons of Eagles in the club with 60 series some even have the 14L all different types of transmissions 740's to 12 speeds the length is not the problem it is the gearing on the old bird.You can stick anything in a Eagle I know of one that has a Deutsch V8 it will pass anything except a fuel stop he gets around 4 mpg with a good tailwind  

good luck
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Ericbsc
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« Reply #14 on: September 30, 2010, 06:45:52 PM »

The 4060 tranny should fix the rear 3:73 issue. It is a 4 speed with double overdrive, or 5 speed with single overdrive. According to the allison tech I spoke to the overdrive ratio is programable?
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