I just put a deposit on a 2000 Frieghliner FL70 it has 81,000 miles 6 speed trans, 3126 Cat 230Hp air ride rear 16' contractors dump body. The truck is in perfect shape and very clean. I am planing on swaping the body to put a 12' -14' hooklift on it soon. I have one question can a engine brake be added to this motor with out to much work or cost. And also what about a locking rear. If any body can help I would appricated it.
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Frieghtliner FL70
- Thread starter Nac
- Start date
2004F550
Charter Member
exhaust brake real easy......... engine brake, more expensive, not easy.....in simple terms
I can't help with the engine brake, but I do have a little concern about the 6 speed tranny. With any kind of load on the truck in hilly regions you will tend to become gear bound and unless the rear is real low geared, you'll have trouble on job sites. It sounds like a nice truck but I'm not sure it's too well suited for the job application you list.
triaxle
Well-Known Member
Compression Brakes
Jake brakes, a.k.a. compression brakes were initially distributed and patented by a man named Jacobs. The original design work was done for applications involving cummins engines but the designs were broadened to work with cat and detroit engines.
The patents have expired now and engine manufacturers and aftermarket sources exist.
About 10 years ago I priced an aftermarket compression brake system for a NTC 400. The kit and install price ran about $2.2k, then.
Call Cat and ask if a compression brake is available for your engine from the manufacturer and call your local diesel shop and find out what is available aftermarket. Get a competent shop to do the install, tolerences for jake brake settings are as small as 3/17,000.
It is important to remember, the amount of braking horsepower an engine can produce is based on the engines hp. ( for instance: a cummins 600 produces more braking hp than a cummins 350.)
One additional note: I think small towns in western Canada may profit from the sale of brake shoes. There is nothing more annoying than coming down a 25 mile 8% grade and entering a town that has signs up that say, " Use of compression brakes prohibited." If jake brakes were good enough for John Wayne, they're good enough for western Canada. :cussing
Detroit locker makes limited slip and locking rears. We used their product in a mid size truck and were very impressed.
Good luck finding ( or modifying) the truck you need.
Jake brakes, a.k.a. compression brakes were initially distributed and patented by a man named Jacobs. The original design work was done for applications involving cummins engines but the designs were broadened to work with cat and detroit engines.
The patents have expired now and engine manufacturers and aftermarket sources exist.
About 10 years ago I priced an aftermarket compression brake system for a NTC 400. The kit and install price ran about $2.2k, then.
Call Cat and ask if a compression brake is available for your engine from the manufacturer and call your local diesel shop and find out what is available aftermarket. Get a competent shop to do the install, tolerences for jake brake settings are as small as 3/17,000.
It is important to remember, the amount of braking horsepower an engine can produce is based on the engines hp. ( for instance: a cummins 600 produces more braking hp than a cummins 350.)
One additional note: I think small towns in western Canada may profit from the sale of brake shoes. There is nothing more annoying than coming down a 25 mile 8% grade and entering a town that has signs up that say, " Use of compression brakes prohibited." If jake brakes were good enough for John Wayne, they're good enough for western Canada. :cussing
Detroit locker makes limited slip and locking rears. We used their product in a mid size truck and were very impressed.
Good luck finding ( or modifying) the truck you need.
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Steve I agree with you that a 6 speed is a bit limited I was looking for a 8LL but was not lucky enough to find one that met my spec. The truck will be 90% of the time on road moving my stuff around that why I am going with the hooklift so i can put my mini or skid steer on the truck and do not need to pull a trailer. This is a starter truck for know hopefully buisness goes good and I will be getting a tandem Volvo VHD next year.
I did a little poking around tonight and it seems that only exhaust brakes are available for the 3126. These don't offer as much braking horsepower as compression release engine brakes, but are somewhat effective. I rigged up my F-350 to activate the butterfly valve to the turbo on brakin and saw a 15 mph drop in going down a steep grade without touching the brakes. Before the conversion I had to brake often down the same grade to stay below 60 mph.
I have to disagree with the suggestion that Jake brake hp is related to engine hp. It's more a function of engine displacement and valve timing. A Jake brake releases engine compression at the top of the stroke, allowing the diesel to generate vacuum which it normally does not do. This is what supplies the brake hp.
Two examples would be these: An engine which gains 50 hp by having the pump pressure turned up will not see a gain in braking hp, the same displacement and valve timing exist.
A 350 hp 92 Series Detroit will not have anywhere near the amount of brake hp that a Cummins NTC350 will due to the difference in valve timing and 4 stroke vs. 2 stroke.
I have to disagree with the suggestion that Jake brake hp is related to engine hp. It's more a function of engine displacement and valve timing. A Jake brake releases engine compression at the top of the stroke, allowing the diesel to generate vacuum which it normally does not do. This is what supplies the brake hp.
Two examples would be these: An engine which gains 50 hp by having the pump pressure turned up will not see a gain in braking hp, the same displacement and valve timing exist.
A 350 hp 92 Series Detroit will not have anywhere near the amount of brake hp that a Cummins NTC350 will due to the difference in valve timing and 4 stroke vs. 2 stroke.
If you dont already have a good diesel shop to perfrom some of the work for you, I recommend Miller Diesel in Dover (On Blackwell) And if you can do the hooklift yourself Bristol Donald does good work, stay away from T. Sanchez In Ledgewood, aka Beau Rock of Ledgewood.
LaLaMan said:
I am going to take it to Franks GMC/ Frieghtiner to do a Pac brake. Bristol Donald does not do hooklift's, American rolloff is trying to sell me the hooklift they manufacture which does not met my requirments. Actully I did order it from Tony Sanchez there are going to install a 20,000 dual pivot Amphiroll hooklift there price was good and they only have a 1 week lead time not 6-8 like some others. Why do you say stay away from Tony Sanches I know a lot of guys with there body they all have no complaints.
cat320
Charter Member
That is a nice set up .How long is the body on there ?
Bob Horrell
Charter Member
NAC, how is the 6 speed doing for you? I have been looking at single axle dump trucks to do similar to what you are doing and have been shying away from the 6 speeds. I am in a hilly area and thought I would have to have at least a 9 speed. It is good to hear from someone with a 6 speed to see how they like it.
Thanks in advance,
Bob
Thanks in advance,
Bob
It is a 14' body on there now but I can run up to 16'. The 6 speed is not bad I too was looking for a 8LL trans. As long as you have the power behind the 6 speed then you will be fine at least a 230 hp but I would go with more.
Bob Horrell
Charter Member
Thanks for the reply NAC. The CAT 3126 can easily go to 300hp. If you feel the need for more power, you might want to check with a reputable diesel shop and see what it takes. Sometimes it is simple and inexpensive.
Bob
Bob
Bob Horrell
Charter Member
They come with 300 hp from the factory in many applications. I am not familiar with what the differences are in a 3126. Sometimes it is as simple as a minor change in the injector pump or, if it is electronically controlled, a different chip in the ECM. Thats why you need to check with a reputable diesel mechanic. Some changes are expensive as they require different pistons etc.
My little 5.9 cummins easily goes to 300 hp with no damage to the engine. Stock it was 215 hp.
With any modification I would recommend an exhaust temperature guage so you can keep an eye on what the engine is doing. These should come as standard equipment on all trucks but they don't. They aren't expensive (around $200 for a good one) and only about an hour to hook up. They are also good for monitoring temp for shutdown so you don't turn the engine off too soon and ruin the turbo bearings.
I drove a truck with the stock 300hp 3126 and it really ran strong.
My little 5.9 cummins easily goes to 300 hp with no damage to the engine. Stock it was 215 hp.
With any modification I would recommend an exhaust temperature guage so you can keep an eye on what the engine is doing. These should come as standard equipment on all trucks but they don't. They aren't expensive (around $200 for a good one) and only about an hour to hook up. They are also good for monitoring temp for shutdown so you don't turn the engine off too soon and ruin the turbo bearings.
I drove a truck with the stock 300hp 3126 and it really ran strong.
Hey Bob, it sounds like you need to hook up with John DiMartino!!! :naughty