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Talk to me about exhaust brakes

A_G said:
On a 7.3 if you still had your EBPV guys would wire that up to be a exhaust brake.
Click to expand...

Theres the danger of valve float at higher rpms on higher mileage engines with this. I'd have to look them up, but comp cams make beehive springs for the 7.3. When I finally start on my build I intend to use the ebpv valve as an engine brake, but upgrading the valve spring to eliminate any chance of valve float.
Lots of guys have done it and suffered no damage from it. Ymmv.
 
MuntCuffin said:
Theres the danger of valve float at higher rpms on higher mileage engines with this. I'd have to look them up, but comp cams make beehive springs for the 7.3. When I finally start on my build I intend to use the ebpv valve as an engine brake, but upgrading the valve spring to eliminate any chance of valve float.
Lots of guys have done it and suffered no damage from it. Ymmv.
Click to expand...
beehive springs are a high rpm thing, less mass in the retainer and moving half of the spring
you're spinning that 7.3 to what, 5k max?
just get some stronger conventional valve springs
 
so, bringing this back to top.
I put a Pacbrake on my 99 this last weekend. seems to work ok, haven't tried it with a full trailer yet. but, it seems to bleed off the air very quickly, releasing the valve or at least not holding it shut all the way. is that normal to hear the hiss of air out the solonid while the brake is engaging?

Also, don't like how the compressor comes on with the key. is it as simple as wiring in a switch to keep the power off of it until i'm ready?.... IE, after the truck starts? it seemed in early tests when I was installing and wiring it, that the brain really wanted that compressor on early before it would work happy.
 
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A_G said:
On a 7.3 if you still had your EBPV guys would wire that up to be a exhaust brake.
Click to expand...

Heavy loads will build enough pressure to bend the butterfly shaft and stick the valve closed. I had to pull over and hammer mine back open in Colorado. It did work well though.
 
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