If you toggle your OD button on the gear selector lever to the off position, and your 4r100 will go into engine braking mode. Not like a Jake in a real truck, but it will definately help slow you down. The PCM locks up the torque converter and lets the engine slow the truck just as if you have a manual.

 

I really want to install an aftermarket exhaust break, I was looking at the PAC brake:

PRXB Exhaust Brakes - PacBrake - Exhaust and Engine Brakes for Automotive, Motorhome, Medium Duty and Heavy Duty Vehicles

and the BD:

http://www.dieselperformance.com/pro..._Air_Brake.pdf

anyone have there favorites/ Recommendations? Comments?

 

BD is a loyal sponsor, and they post regurlaly, their products are very good, but their support will be unsurpassed. They support FTE, wo when we can we should support them.

you can contact dave direct, just shoot him a PM

 

A jake brake holds the exhaust open on the compression and firing stoke of the motor. It never holds a valve closed. By opening the valve at that time, the explostion of fuel goes out the exhaust. Newer motors with electric controled injectors ,shut of the injector so no fuel is added. The motor loses power and will slow down. Thats why a Jake is SO much louder than than when the same motor is in a hard pull.
I know very little about Powerstrokes, I learning, but when it comes to Cat, Cummins,Detroit, I am very good.

I know of a machine shop that is trying to make castings and all the valving to install a true jake on a PSD. Not sure if it will be for the 7.3 or 6.no no's.

 

thanks Bryan,

I will do that. Do you know his user name?

 

Real jake brakes cause the exhaust valves to open at top dead center of the compression stroke. Instead of the air being pushed out, like in a normal exhaust stroke, it essentially explodes all at once out of the cylinder, giving you that machine gun fire sound.

An exhaust brake creates back pressure in the exhaust system, making the pistons fight against pushing exhaust gasses out, slowing the engine down. Exhaust brakes will NOT give you the sound that a jake brake does, although they do have their own distinctive sound in that they make the turbo whistle very very loud

 

ask, and yee shall receive.

Dave is one of the good guys, and will go the extra mile to make sure you are happy with his products.

dave at BD Power FTE Sponsor


BD Power - The Leaders in Diesel Performance
dave@bd-power.com
800-887-5030 ext. 105

 

Thanks man! REPS TO YA. I am reading the installation instructions now to see if I have any issues with the Van Turbo setup.....

 

The way i learned about it, there are castings above the valve train, and when the jake brake is activated, electronic solenoids use engine oil pressure to push on pistons inside the castings to modulate the valves open when the camshaft normally says "closed". The way i was taught about jake brake function, the valves stay closed on the intake stroke, making a huge vacuum effect slowing the crankshaft down, on the way back up on the compression stroke, the valves open at near TDC, all the pressurized air goes out of the cylinder, to the exhaust manifold, and on the power stroke, there is no driving force for the piston, or compressed air to ignite the fuel (if it is injected), so this in turn also slows down the crankshaft. Doing this cycle like this, it is easy to see how all four cycles are turned into a power braking cycle. A normal 450hp engine can have well over 475 braking hp, or IOW how fast you can SLOW DOWN the dyno rollers.

 

No they only connect to the exhaust valves not the intake. If the intake valves were to stay closed a pushrod motor would have bent pushrods, an over head cam motor would have MAJOR damage.

Oil retarders are the best brake saver idea ever.
Jakes are great,the 2nd best brake saver out there.
On the other hand, exhaust brakes are very hard on a motor. A company called Blue Ox (AKA OX BRAKE) made exhaust brakes for larger motors. Many of us truckdrivers who had a motor ie. 1693 CAT couldnt run a jake. So we relied on exhaust brakes, the use of these greatly reduced the life of our motors. It is like turning on your air compressor and never letting it stop at a set psi, hard on rings and valve train. The intake valve is tring to open when there is still psi in the cylinder. Very easy to burn a valve. Not saying a jake brake is not hurt'n the motor, Jakobs Eng. used to state with all their sytems it would reduce engine life by as much as 25%, but save brake life by 60%.

I could argue with many members about the use of the ebpv as a brake, but every man for himself.
I have driven over 2 million miles in semis and worked on them all my life. Never have I meet a smart mech. that would say exhaust brakes are good.
I took a tour of the Banks plant, and when asked if anyone had ?'s I asked how the could justify saying their systems dont wont harm your motor they said "the average driver will use this so litle the damage will be minimum" .

 

is an exhaust brake going to hurt my engine? I wanna slow down my 25 foot landscape trailer but dont wanna hurt the truck.

 

<TABLE borderColor=#888888 cellSpacing=0 cellPadding=4 width="100%" border=1><TBODY><TR><TD background=/images/co_head_bcgrnd.gif colSpan=2 bg***************>With a Jacobs Engine Brake<SUP>®</SUP>

</TD></TR><TR><TD vAlign=top bg***************>(1A) The intake valve opens and air is forced into the cylinder by boost pressure from the turbocharger.</TD><TD bgColor=#cccccc>

</TD></TR><TR><TD vAlign=top bg***************>(2A) Air is compressed to approximately 500PSI by the engine piston. The energy required to compress this air is produced by the vehicle's driving wheels. Near top dead center, the Jacobs Engine Brake<SUP>®</SUP> opens the exhaust valves, venting the high pressure air and dissipating the stored energy through the exhaust system.</TD><TD bgColor=#cccccc>

</TD></TR><TR><TD vAlign=top bg***************>(3A) On the downward stroke, essentially no energy is returned to the piston (and to the driving wheels). There is a loss of energy. This loss is how the retarding work is done.</TD><TD bgColor=#cccccc>

</TD></TR><TR><TD vAlign=top bg***************>(4A) Normal exhaust stroke.</TD><TD bgColor=#cccccc>

</TD></TR></TBODY></TABLE>

 

A good quality brake with the correct transmission controller WILL NOT hurt the engine or transmission. If they did we would not be in business, we have been selling them for almost 20 years now.