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03-21-2018, 07:50 AM
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#85
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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__________________
Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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03-21-2018, 08:49 AM
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#86
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New to the RV World
Vintage RV Owners Club American Coach Owners Club
Join Date: Aug 2013
Location: Rochester, NY
Posts: 3,092
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Quote:
Originally Posted by stardream
where did you get the 450hp from, I thought all the cummins 8.3 came with 300hp
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My 8.3 from the factory is 325
Cummins 6CTA, Ref # 53-34874-004 engine # 45358278, model C8.3-325
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03-21-2018, 10:17 AM
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#87
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Senior Member
American Coach Owners Club Spartan Chassis
Join Date: Dec 2015
Location: Florida
Posts: 1,970
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Increasing HP of the 6CTA8.3 Cummins
Quote:
Originally Posted by NHRA225
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Chuck, That means you installed the #05 Plate?
What transmission do you have? Mine has an Allison MT643 4-speed automatic. I am concerned about overpowering and harming the transmission. Is that an issue for mine?
__________________
Charles and Beverly
"The Eagle" - 1991 American Eagle 38J - Cummins 6CTA8.3 300hp DP, Allison MT643 4spd. Trans., Spartan chassis.
Link to our Eagle Thread
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03-21-2018, 10:45 AM
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#88
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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Yes I installed the # 5 Plate kit !
I have the MD 3060 and I called Allison Engineers to confirm that it could handle the additional torque.
Your Allison MT643 4-speed automatic Will Not handle the additional torque, But if your interested call Allison just to confirm.
If you don't tow a 10,000 lb Enclosed Trailer I wouldn't worry about upping the power.
__________________
Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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03-21-2018, 12:33 PM
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#89
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Senior Member
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,474
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Mines a 1999 year, 8.3 ISC @ 350 from factory.
I ain't towing some of the stuff you guys are, but I've got no power complaint
__________________
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
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03-21-2018, 01:05 PM
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#90
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Senior Member
American Coach Owners Club Spartan Chassis
Join Date: Apr 2017
Posts: 391
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I wonder what the difference is between the 97 and 98 mechanical 8.3 engines?
I saw tstproducts doesn't offer a plate for the 98's. Must be a different setup.
__________________
1998 American Dream Race Car Hauler
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03-21-2018, 04:01 PM
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#91
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Member
Join Date: Jan 2015
Posts: 58
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travel truck
CWK---Hope this finds you? You may be interest in project,1992 pretty well the same coach,you will find me way back on page 90.I to have been on Isspro trip,one thing I would like to mention are the front axel brake chambers.The coaches come with #16,Ichanged mine to #20 a nice change to brake performance.I have been just about in all the systems,if I can help-----TKS
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03-21-2018, 05:31 PM
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#92
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Senior Member
American Coach Owners Club Spartan Chassis
Join Date: Dec 2015
Location: Florida
Posts: 1,970
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Keith (Travel_Truck),
Thanks for the offer of help if I need it. I found your 2015 thread on your coach. That was some pretty ambitious work: engine in and out twice, replacing rubber roof with fiberglass, etc. Wow.
I have a lot of maintenance to get mine up to basic operating level. I have only had my coach for less than a month. Thanks for the heads-up on the brakes. I am not sure what that means yet, but I am willing to learn. My mechanical background is with gasoline-powered vehicles (back in the 70's). This is my first diesel and my first with air brakes and suspension. My goal is to learn as much as possible so I can perform the work as well as understand how to best operate my coach.
__________________
Charles and Beverly
"The Eagle" - 1991 American Eagle 38J - Cummins 6CTA8.3 300hp DP, Allison MT643 4spd. Trans., Spartan chassis.
Link to our Eagle Thread
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03-21-2018, 06:29 PM
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#93
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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Quote:
Originally Posted by idoxlr8
I wonder what the difference is between the 97 and 98 mechanical 8.3 engines?
I saw tstproducts doesn't offer a plate for the 98's. Must be a different setup.
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Something with the later P 7100 Pump being non compatible with changing the Fuel Plate.
__________________
Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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03-21-2018, 06:33 PM
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#94
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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Quote:
Originally Posted by Travel Truck
CWK---Hope this finds you? You may be interest in project,1992 pretty well the same coach,you will find me way back on page 90.I to have been on Isspro trip,one thing I would like to mention are the front axel brake chambers.The coaches come with #16,Ichanged mine to #20 a nice change to brake performance.I have been just about in all the systems,if I can help-----TKS
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Haven't seen you on here in a long long time ! Welcome back !!
__________________
Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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03-22-2018, 04:52 AM
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#95
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Senior Member
Freightliner Owners Club Retired Fire Service RVer's
Join Date: Apr 2011
Location: N E Ohio
Posts: 4,403
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Charles,
The numbers that Keith is talking about is the size of the brake chamber on the front axle. The larger diameter of the #20 will but more pressure on the front brake shoes.
Frank
__________________
05 Alfa Gold 40' Motor Home "Goldie",
03 Malibu Toad
in a 24' CargoMate trailer.
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03-22-2018, 05:06 AM
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#96
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Senior Member
American Coach Owners Club Spartan Chassis
Join Date: Apr 2017
Posts: 391
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Quote:
Originally Posted by NHRA225
Something with the later P 7100 Pump being non compatible with changing the Fuel Plate.
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Darn, I'd like to turn mine up a bit. Does pretty good most of the time, but man on some of those big grades it can struggle.
__________________
1998 American Dream Race Car Hauler
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03-22-2018, 05:15 AM
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#97
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Senior Member
American Coach Owners Club Spartan Chassis
Join Date: Dec 2015
Location: Florida
Posts: 1,970
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Quote:
Originally Posted by Franka548
Charles,
The numbers that Keith is talking about is the size of the brake chamber on the front axle. The larger diameter of the #20 will but more pressure on the front brake shoes.
Frank
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Thanks! I did some google searching last night and found photos of the different types (#12, #16, #20, #30, etc.) of brake chambers. Your explanation helps me make sense of what I saw.
My first thought of putting more pressure on the front brake shoes was what would happen if one applied the front brakes of a bicycle more than the back brakes. One might flip end over end. But, that's not too likely with a DP!
I usually defer to the way the original engineers designed things, a.k.a., leave things "stock." Why would i want to change the braking system?
Speaking of brakes, I have found the Pacbrake (exhaust brake) on this engine. I did not know where it was on the ride home. PO said he never used it. In fact, when he did use it once it stuck and essentially disabled the coach. He did not know what it was until someone else looked at the engine and tapped it with a hammer to open it back up. I believe it has been cleaned and/or replaced since. I have tried it while fast-idling, and it seems to work ok.
The Pacbrake manual says something about using it for braking in most situations instead of the service brakes. From the Pacbrake manual: "Ideally, you should only use your service brake to come to a complete stop, or for emergencies."
Is this the way most of you use the braking systems?
__________________
Charles and Beverly
"The Eagle" - 1991 American Eagle 38J - Cummins 6CTA8.3 300hp DP, Allison MT643 4spd. Trans., Spartan chassis.
Link to our Eagle Thread
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03-22-2018, 05:30 AM
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#98
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Senior Member
Join Date: Sep 2013
Posts: 4,121
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Good morning all! Hi CWK!
I use my pac brake often. It is on when I drive the interstates, and I only turn it off in slow city driving as it seems coasting comes into play a lot,,,, and on my coach if you lift off the acelerator, the brake activates. It is very affective, will stop you pretty quick when your going 30 mph.
I wonder about larger brake chambers on the front axle. Unless you have anti-lock brakes, too much front brake is a bad thing. Locking front wheels can ruin your day. Rainey day emergency stop comes to mind. Rear brakes,,,,, with all that rear weight, and traction of 4 tires,,,, might be better and useful. Proportional braking is an important factor.
L.
L.
__________________
RVing since 1974!
Lots of Motorcycles
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