Does a engine brake increase EGTs??

[Turboman]

All things being equal, will a truck with an engine brake run hotter EGTs than one with no engine brake?

 

[Whitmore]

turboman

at idle my jacobs brake raises EGT by 200 to 300 degrees, as far as braking down a big hill, I noticed no temp gain ... ... ... ... ... ... ... ... . Kevin

 

[HC]

I see you have a Pacbrake, so I assume you mean: Does the brake increase EGT's even when in the OFF position?



There should be no difference in EGT's, when the brake is off. If you're seeing slightly higher EGT's, then I would be suspicious that maybe the flapper is not fully open. Open and close a few times, maybe even whap it with a hammer or if you can twist the exposed portion of the shaft that holds the butterfly.

 

[Turboman]

HC knows what I mean!

Yea that's what I'm talking about. I have been told by some "experts" that the flapper in the brake stops the circular motion of the exhaust flow thereby slowing the airflow and increasing EGTs. I'm trying to decide what to do next. I can't run the PE Comp above level one without a meltdown, which I knew would be a problem. I don't want to give up the Pacbrake to go with an HX-40 and don't want shell out for a 4" exhaust brake either. I wonder if Piers 14cm or 16 cm turbo would be enough???

 

[HC]

I don't know about the PacBrake, but, check out BD's website for their comparison to Banks. Basically, the dyno testing they did head-on with the new Banks brake showed that the Banks claims (which include "not interfering with the swirling flow near the turbo exit") appeared to be based on "theory" more than "proven fact". There was no measurable HP difference between the brakes in this test. (grain of salt - it's BD's website)



You can probably look at pictures of your Pacbrake, pictures of the BD, and figure if the same test helps ease your mind or not.



If you're seeing high EGT's, I'd say you need to open up your exhaust some. When I went to 4", with a BD brake added at the turbo outlet the same day, my "loaded" EGT's dropped about 200 degrees post turbo.

 

[carson6]

up up and away

My pack brake raised my egt about 200

 

[Turboman]

EGTs

carson6, I'm talking about when the ebrake is off. Is that what you mean too? Just the fact that the exhaust must go through it, does that increase exh temp?

 

[FDziurda]

PacBrake vs EGTs

I did not notice any difference in EGTs before vs after installing my PacBrake, when running with the brake turned off. If there was any difference, it was very little <50 degrees.



When decelerating, with the brake engaged and providing retarding power (I have a 6-speed manual), the EGT's do not drop off, since the butterfly is closed, restricting the exhaust. With the brake "off" (butterfly open), the EGTs drop like a rock when decelerating.



Frank Dz

 

[Driftwood Ram]

EGT'S

I noticed no difference in egt's after installing the Pac Brake with the brake OFF

 

[carson6]

something else

I also had my "DDII" installed @ the same time and that could be the reason my egt's went up!

 

[Forrest]

I noticed an increase in EGT's in the brake mode. It was heading down into Death Valley, from 4k' to sea level in a short distance. I think I had it in 3rd & only used the brakes once or twice, the Pac-Brake did the rest. It was just over 200 degrees, maybe 300. No biggie, it was doing it's job. Oo.