Thread: Exhaust Brake for 3.9 Isuzu County

Love exhaust brakes on a truck.

If you do it please, please shows us some pics.

Cheers
Simon

I cannot see any reason why you could not fit one - but on the other hand I cannot see why you would need to, unless you are doing a lot of heavy towing in hilly country. The brakes work quite well, and engine braking is not too bad either.

John

easy enough to do, go to a ruck wreckers and grab a flap valve exhaust brake from any number of 22 seater busses and light trucks.

Originally Posted by JDNSW

I cannot see any reason why you could not fit one - but on the other hand I cannot see why you would need to, unless you are doing a lot of heavy towing in hilly country. The brakes work quite well, and engine braking is not too bad either.

John

I am with JD on this. No need in normal usage, and if towing a heavy trailer then the trailer brakes should obviate the need for a compression brake. I have had both exhaust and Jacobs brakes on heavy trucks and they are magic in these applications but a Land Rover even with heavy trailer is only a fraction of the weight. aI have also driven trucks with Allison and Caterpillar retarders. I always felt the Jake Brake to be the most effective. Nice sound too. Lift off a laden 8V92TA Detroit with Jake at 2300 rpm in top on a long downhill grade and you will smile at the sounds.

I'd love to see it done to an isuzu!!

TIM.

I've got a few customers with these on their 110 Isuzus. I'm thinking about fitting one to mine, the only thing to remember that the EGT's rise significantly when it is applied, but this isn't an issue with the normal engine duty cycle of a 110

It works well on road and excellently off road. And it sounds pretty too.


JC

Originally Posted by justinc

I've got a few customers with these on their 110 Isuzus. I'm thinking about fitting one to mine, the only thing to remember that the EGT's rise significantly when it is applied, but this isn't an issue with the normal engine duty cycle of a 110

It works well on road and excellently off road. And it sounds pretty too.


JC

urmm no they dont,,, or they shouldnt...

set up correctly they should only come on when the engine is at the no fuel or idle fuel settings.

if it cant be setup to come on with no fuel then there should be sufficient flow past the brake valve to allow normal idling RPMs to be maintained.

if it can be setup to come on at no fuel then there should also be a device installed that automatically turns it off once the engine dips below idle RPM's and the fuel should switch back on for idle...

if theres no fuel getting into the combustion chamber then there should be less EGT.

The other side of that should be taken care of by the govenor, as soon as you lift off the noise and the engine is in an over run condition the FIP's govenor should wind the fuel rack (or sleeve or collar or whatever other fuel injection system your using) back to no fuel automatically.

Wheres the extra heat come from?

Right on, Dave. Compression brakes in trucks always either cut the fuel right off (Cummins, Mercedes Benz) or back to idle setting (Detroit two strokes). In the old M-Benz 1418/1923 series the exhaust brake button on the floor was also the engine stopper.