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Engine Specific Info and Questions => IDI Engine => Topic started by: camboscams on October 09, 2011, 02:34:25 pm
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So on the newer dodge cummins trucks they have an "exhaust brake" Which all there doing is closing the vanes on the VNT turbos that their equipped with and the backpressure from producing a little boost gives them some braking power. So on my setup I have a vnt 15 with a linkage from the vane leve to the throttle, so I'm going down a hill wih the engine reved up and shut the key off then push the pedel to the floor. So without the fuel being injected it creates alittle backpressure and makes about 3-4 pounds of boost and really slows you down. So now all I have to do is use the brake switch to shut off the fuel and then go to full pedel and have super long-lasting brakes!!
Just something interesting I discovered
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mine didnt really work all that good at exhaust braking..
i didnt shut the vanes clear up at 3 grand tho..
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Yea I was surprised how well it worked
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i find that engine braking is often more than adequate for me.. my diesel slows down MUCH FASTER than my gasser when compression braking.. mostly because of not having an air throttle, and being VERY high compression..
most of the time, i use my brakes only at very low speeds, like when first gear wont slow me any further..
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Meant to ask what's that sound like a Jake brake at all?
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Meant to ask what's that sound like a Jake brake at all?
jake brakes hold the exhaust valves open. thats why they are soo loud. nothing but a Jake brake sounds like a Jake brake.. (Jacobs retard brake i believe its called)
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I agree with you ROR I'm not looking to replace the use of my brakes with this discovery but it would be nice coming down some of the grades that I'm surrounded by in the mountains of Virginia. I'm thinking of trying to rig the fuel shutoff solenoid so I do t have to hit the key everytime I would want to do this. I wonder what the service life of our shutoff solenoids are?
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they dont really fail. Pretty sure my pump had its original at 300k. and 20 years.
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Wire it through a switch actuated by the throttle arm, which is run through a toggle switch on the dash. This will allow you to flick the switch on the dash to turn it on, and when you release the throttle, it'll kill the fuel, just don't forget to flick the switch back off again.... AFAIK Jake brakes work in a similar fashion.
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My VNT vanes are connected to a lever on the dash so this would be easy for me to try,
thanks for pointing this out,
sounds like a fun experiment.
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Yea I was trying to figure out how to wire it and nit have it shut off at stoplights when I forget to flip the switch back off. Running it off the brake light switch would be nice but it I'm sitting intraffic with my foot on the brake that won't work either.
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What about a second switch off the clutch that disables it when the clutch is pushed in regardless of if the master switch is on? That way when you get to a light and clutch in, it shuts "off" leaving the fuel running... Not much point in engine braking when the clutch is in.
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A push-momentary button would do the trick, ideally mounted somewhere convenient, like the steering wheel, or the dash within finger reach.
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^ Except when I'm going down a 15km grade, I don't really feel like holding my finger on the dash for 20 minutes.
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Perhaps a momentary push-button near the left foot? As the old trucks. (Volvo / Scania)
(( I use Google's translation from Swedish to English. Is it readable? ))
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Perhaps a momentary push-button near the left foot? As the old trucks. (Volvo / Scania)
(( I use Google's translation from Swedish to English. Is it readable? ))
Yes, it worked flawlessly! (Ja, det fungerade felfritt!) lol
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(Ja, det fungerade felfritt!) lol
;D
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My VNT vanes are connected to a lever on the dash so this would be easy for me to try,
thanks for pointing this out,
sounds like a fun experiment.
Did you ever try this? And do you have problems with your vanes sticking? Mine are jammed to 50% of travel in about 2 days and then i have to work the vanes by hand to loosen them up.