Reply
 
Thread Tools Display Modes
 
Old 08-20-2016, 11:40 PM   #251
Bus Nut
 
syke's Avatar
 
Join Date: Mar 2011
Location: from: Prescott, AZ currently: Denver, CO
Posts: 469
Year: 1992
Coachwork: BlueBird
Chassis: All American RE
Engine: 8.3 Cummins
Rated Cap: 72
Quote:
Originally Posted by aaronsb View Post
The 8.3 CTA - mechanical injection and allison md3060 is a great combination.

The newer cummis 8.3 with electronic injection often is set for more power but I've also been a fan of direct mechanical diesels. (Funny enough I love fuel injection gasoline engines and hate carburetors)

Ours is currently rated for 275 HP, and I plan on adding a pacbrake exhaust brake for a little more control on grades.

Some md3060 busses also have the retarder option which is really great on big grades.

A quirk of the Allison is they are basically impossible to reprogram without help from Allison, and they won't help ya. The school district that owned our bus went to the effort to change the ring and pinion out, so we have a very long legged bus. Its crazy it was easier/cheaper to do a r&p swap than to just reprogram the trans computer.

I can go about 70 mph @1800 rpm.
Nice combo. I spoke with a few "big diesel" mechanics that said I would need stronger valve springs before a pacbrake install. I decided to forgo it at this point. Plus I would have to add a converter lockup switch. Probably not a huge issue in the grand scheme but it was money well spent in other areas.
I also inquired about turning it up. They said 250hp without an issue as it is evidently spec'd as such in some models. Again I opted to keep her stock. We get 63mph at 2200. More hp was only going to get me to 63mph faster... no need for that. Maybe get a few more mph on the grades but again... at 35mph the difference between 35mph and maybe 39mph is not that big of a deal. It is still slow no matter how you slice it. I just put her in the right hand lane and kick back and enjoy the view.
This bus came from the OR mountain country with 6.88 gears. She can pull a house but runs out of legs on the big end.
I've heard the r&p swap is much cheaper then the other options. I suppose 22.5 or maybe 24's are in our future. Get a few more mph out of her.
__________________
Ryan
Bluebird All American RE: Great White Buffalo (gone but not forgotten)
Our build thread: viewtopic.php?f=9&t=10065
syke is offline   Reply With Quote
Old 08-20-2016, 11:41 PM   #252
Bus Nut
 
syke's Avatar
 
Join Date: Mar 2011
Location: from: Prescott, AZ currently: Denver, CO
Posts: 469
Year: 1992
Coachwork: BlueBird
Chassis: All American RE
Engine: 8.3 Cummins
Rated Cap: 72
Quote:
Originally Posted by aaronsb View Post
That door really looks great!
Thanks.

It was by far the best piece of kit on the entire bus.

Well that and maybe skinning the overhead warning lights... but that was easy and cheap in comparison.

__________________
Ryan
Bluebird All American RE: Great White Buffalo (gone but not forgotten)
Our build thread: viewtopic.php?f=9&t=10065
syke is offline   Reply With Quote
Old 08-21-2016, 05:14 AM   #253
Almost There
 
Join Date: Sep 2013
Location: Mount Victory, OH
Posts: 79
Quote:
Originally Posted by aaronsb View Post
The 8.3 CTA - mechanical injection and allison md3060 is a great combination.

The newer cummis 8.3 with electronic injection often is set for more power but I've also been a fan of direct mechanical diesels. (Funny enough I love fuel injection gasoline engines and hate carburetors)

Ours is currently rated for 275 HP, and I plan on adding a pacbrake exhaust brake for a little more control on grades.

Some md3060 busses also have the retarder option which is really great on big grades.

A quirk of the Allison is they are basically impossible to reprogram without help from Allison, and they won't help ya. The school district that owned our bus went to the effort to change the ring and pinion out, so we have a very long legged bus. Its crazy it was easier/cheaper to do a r&p swap than to just reprogram the trans computer.

I can go about 70 mph @1800 rpm.
I also like the simplicity of the mechanical injection. I am a diesel generator tech and work on all kinds of diesel engines (John Deere, Detroit, Cat, Cummins, Volvo, ect). I am a Cummins fan so a 8.3 is my first choice. I can't believe nobody has hacked the 6th gear lockout. Must not be a big want for most. So you can't even pay a shop to unlock it?
superduty_59 is offline   Reply With Quote
Old 08-21-2016, 05:24 AM   #254
Almost There
 
CaptainHooligan's Avatar
 
Join Date: Aug 2016
Location: WNC
Posts: 95
Quote:
Originally Posted by aaronsb View Post
The 8.3 CTA - mechanical injection and allison md3060 is a great combination.

The newer cummis 8.3 with electronic injection often is set for more power but I've also been a fan of direct mechanical diesels. (Funny enough I love fuel injection gasoline engines and hate carburetors)

Ours is currently rated for 275 HP, and I plan on adding a pacbrake exhaust brake for a little more control on grades.

Some md3060 busses also have the retarder option which is really great on big grades.

A quirk of the Allison is they are basically impossible to reprogram without help from Allison, and they won't help ya. The school district that owned our bus went to the effort to change the ring and pinion out, so we have a very long legged bus. Its crazy it was easier/cheaper to do a r&p swap than to just reprogram the trans computer.

I can go about 70 mph @1800 rpm.
What's the gearing on your bus?
CaptainHooligan is offline   Reply With Quote
Old 08-21-2016, 07:28 AM   #255
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 10,094
Year: 1992
Coachwork: Ward/AmTran
Chassis: International
Engine: dt466
Rated Cap: 78
Aaron has 6th gear unlocked.
__________________
.
Roll Your Own Build Thread
EastCoastCB is offline   Reply With Quote
Old 08-21-2016, 09:51 AM   #256
Bus Crazy
 
milkmania's Avatar
 
Join Date: May 2015
Location: Oklahoma aka "God's blind spot"
Posts: 2,201
Year: 1989
Coachwork: 1853FC International/Navistar
Chassis: 35' Retired Air Force Ambulance
Engine: DT466, MT643
Rated Cap: 6 souls and a driver
Quote:
Originally Posted by aaronsb View Post
That door really looks great!
It's sure got me searching eBay for parts... I've got a buddy with a shop that can make this happen!
Plus, my boss can get 4x8 aluminum sheets for $40 each.
And I substitute teach at a technology school with full access to HVAC' classroom with brake, press, bender, spot welder.... That door is definitely on my to do list!
And the Welding Shop has everything I need to build frame.

Somebody needs to grab this up for $30 plus shipping
RV New 18 x 35 Vertical Replacement Double Slider Window 883 7 | eBay

That seller carries a lot of new pull outs.
__________________
I once complained I had no shoes....
Until I met a man with no feet
milkmania is offline   Reply With Quote
Old 08-21-2016, 11:06 AM   #257
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 5,573
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
The 8.3 can easily be turned up to 250 with no impact on reliability. I have even heard of a few that wound up getting better MPG after being dialed in. Go figure.
Tango is offline   Reply With Quote
Old 08-21-2016, 11:13 AM   #258
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 6,080
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
finding a decent allison shop will unlock it for you... and not charge an arm and a leg... when I was looking at a 2009 I-Bus recently.. its owner said getting 6th was a breeze if you go to an independent transmission shop tat is certified allison as they can get the codes to do it fairly easily.... a full out allison dealer may charge you more..
-Christoper
cadillackid is offline   Reply With Quote
Old 08-21-2016, 11:36 AM   #259
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 5,573
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Roger what Cadillac said. Used to be fairly difficult but lots of folks are getting 6th unlocked these days. Biggest issues with unlocking it on school buses turned out to be the tire and/or driveshaft ratings. Skoolies were never meant to go fast so they use lower V rated tires. And some of the multi-piece drive shafts also have a "critical speed rating" that limits the RPM they can turn without coming through the floor. Overcome those obstacles and even the original manufacturer will sign off on unlocking it to run faster for non-school use. Call around. Lots of "Indies" doing these days.
Tango is offline   Reply With Quote
Old 08-21-2016, 11:39 AM   #260
Site Team
 
Join Date: Jul 2014
Posts: 684
Year: 1998
Coachwork: Bluebird
Chassis: TC2000 RE
Engine: 8.3l Cummins
Rated Cap: 78
I'm not so sure - shift pad onl y indicates up to 5, and the trans wants to shift to the next gear and lug the engine everywhere.
Quote:
Originally Posted by EastCoastCB View Post
Aaron has 6th gear unlocked.
aaronsb is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Great site great info sources frank-id Everything Else | General Skoolie Discussions 1 06-09-2014 10:26 PM
48 White Bus somewhereinusa Classifieds | Buy, Sell, Swap 1 04-14-2013 10:05 AM
Atomic Buffalo Turds.... timbuk Everything Else | General Skoolie Discussions 0 01-23-2011 07:08 PM
White stuff...... lornaschinske Everything Else | General Skoolie Discussions 5 12-20-2010 12:25 PM
Great White Buffalo For Sale Mark&Steph Classifieds | Buy, Sell, Swap 0 11-02-2005 09:11 AM

» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:34 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.