Engine/Transmission (1998.5 - 2002) building Exhaust brake ?????

[KKunz]

Im trying to build a a 4 inch inline brake out of 8. 3L cummins other than to much back presure is there any thing I need to watch out for? what about exhaust brakes with twins? IIRC i should not exced 60# of back presure corect?

 

[Cummins724]

I think you should be fine. If it is holding back too much pressure... . just drill a bigger hole in the butterfly valve. Yes 60# is what I've heard that they hold, but my brothers Pacbrake feels like it holds more than my Jacobs.

 

[NoSeeUm]

I have a remote PRXB and twins. Before that I had a Banks turbo mounted brake. I was told that with twins the brake would be slower to have an effect. If so, it is very hard to notice.



I did have a problem initially getting the bottom turbo's exhaust side v-clamp to seal with the brake on. I finally used some high temperature silicon that I applied into the groove of v-clamp. The hot pipe flanges had no leaks.



If you can find another ISB brake measure the orifice size, that should be sufficient. If it were me I would also have a tapped hole installed so that I could measure the brake back pressure. The exhaust pulses play havoc with a gauge long term, but at idle I would expect about 14-16 psi and as you say possibly up to 60+- psi under high rpm braking.



Jim

 

[NIsaacs]

Some of the older exhaust brakes were adjustable for a versatile fit. No preset orifice for each individual application. On this type, the butterfly is adjustable for your backpressure setting. Make sure you use a gauge to set it or even install one in the cab. I like a tight setting for low rpm hold back, however a gauge will be a must, so you don't over pressure it with higher rpm's. Most brakes have a threaded opening for the gauge attachment. There are usually two openings, one for pyrometer hook up and one for backpressure. Make sure you use the right one.





"NICK"