Different idea for a exhaust brake?

[MarkEkberg]

Can one of these work? Way cheaper.

http://www.amazon.com/QTEC70-Electric-Exhaust-Cutout-Valves/dp/B003R2KS4G

 

[RustyJC]

Can one of these work? Way cheaper.

http://www.amazon.com/QTEC70-Electric-Exhaust-Cutout-Valves/dp/B003R2KS4G

Those valves, I suspect, are only designed to work against the nominal backpressure in the exhaust system - something less than 1-2 PSI. In an exhaust brake application, they would see pressures of 40-50 PSI across the valve. That takes a strong butterfly valve, shaft and actuator to work with that pressure differential across the valve.

Rusty

 

[MarkEkberg]

Those valves, I suspect, are only designed to work against the nominal backpressure in the exhaust system - something less than 1-2 PSI. In an exhaust brake application, they would see pressures of 40-50 PSI across the valve. That takes a strong butterfly valve, shaft and actuator to work with that pressure differential across the valve.

Rusty

I understand that, but when it is closing there would be little no pressure because it has not had a chance to build yet, and when it opens pressure should be released due to clutch engagement or throttle use? The pressure is only there once it is closed and the actuator does not need to hold it there per say.

 

[RustyJC]

I'm referring to the maximum pressure the butterfly valve must sustain across it. If you get back in the throttle, the pressure ahead of the butterfly valve will actually increase, and the actuator has to open the valve against that pressure, right?

I don't think it will work, but hey, if you want to try it, go for it - it's your truck and your money. If I were you, though, I'd do something to control the maximum back-pressure produced by the valve - a real exhaust brake will have a hole in the butterfly, will vary the butterfly position as a function of exhaust pressure ahead of the valve, or will not close "bubble-tight" to allow some control of exhaust pressure ahead of the valve.

Rusty

 

[B.G. Smith]

I agree with Rusty, first it is not heavy enough to handle the pressure, it is a divert valve and sees very little pressure,and it doesn't have provisions to relieve excess pressure as does the Pac Brake etc. (spring loaded orifice valve). On the older engines you have to change the valve springs to keep the back pressure from floating the exhaust valve, it would be unhandy and hard to operate versus the factory types which are tied into the electronics of the truck and work automatically. I do not wish to shoot down your idea, things like this are what got us to where we are today, if no one ever tried a new idea nothing would ever get accomplished. bg

 

[mfurrh55]

No, i had one for my exhaust cutout, screws snapped off and the butterfly valve went flying off down the road

 

[MarkEkberg]

OK just thinking out loud. Seemed like a decent idea out of the staring gate.

 

[SierraRam]

Don't do it, there is no relief built into this valves and they are not engineered to handle the specifications of a turbo diesel.