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Old 01-06-2014, 11:23 AM
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Default Question About Exhaust Brakes

I have some questions about exhaust brakes. I know that you are supposed to use stronger springs on the exhaust valves, but is the reason because the stock springs will allow the back pressure to open the valves? Would the back pressure allow the pistons to contact the valves? Are the springs on 24 valve engines stronger than 12 valve engines?
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Old 01-06-2014, 10:56 PM
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From what I know 12V exhaust springs are 45# springs and the 24V exhaust are 60# springs.

Yes the valves would blow open from the back pressure possibly make contact.
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2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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Old 01-07-2014, 10:27 AM
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I was wondering why I only saw 60# springs for the 12v.
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Old 01-07-2014, 07:47 PM
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I read something about there are exhaust brakes that can be used with the stock springs. It is not supposed to be quite as strong as the one that needs 60# springs. Anybody have any experience with the 'weaker' one? Also, I have heard something about a change that needs to be made in the transmission valve body, but don't know what that would be. Can somebody school me on what needs to be done?
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
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Old 01-08-2014, 08:38 AM
Jagsdiesel Jagsdiesel is offline
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As far as I know Tom. Its not something needed to be done to the valve body. More or less make the trans hold converter lock as possible and transmission to down shift and keep rpms up to make more resistance against exhaust break helping
you stop.

As for the springs. A good kit like a Pac Break kit come with springs for the 12v install.
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Old 01-08-2014, 09:55 AM
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Automatics didn't hold lock up during deceleration so the transmission would only free spin more or less so the exhaust brake would not do anything. So automatics has a lockup controller added with the exhaust brake to aid in this.


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2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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Old 01-08-2014, 11:35 AM
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I understand that if I let off the throttle in O/D the tach drops and the engine provides no deceleration. But, if I manually drop out of O/D the engine does provide some braking. If I downshift the engine also provides more braking. Maybe mine is a bit different than a pure stock one, but I do remember I had the option to get some sort of lock up control for $300 at the time I got my transmission from Dave Goerends.
edit: I would LOVE to have a compression release brake on my truck! I really enjoy the sound of them. I have driven big trucks with them through the rockies.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound

Last edited by MnTom; 01-08-2014 at 11:39 AM.
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Old 01-09-2014, 09:35 PM
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They are 45#...if they were 60 then the 60's they send so you can run over 3200RPM wouldn't exactly be an upgrade.. 24V are 60's, probably because they run 3200 stock.
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Old 01-09-2014, 10:03 PM
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I am more curious than anything. I have no intention of going to a higher RPM GSK.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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