Engine brake for 3B

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Fantom

Fantom

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Hi Guys,
So I was thinking of doing some modifications to the truck, I know there are exhaust brakes that can work on a 3B and there was an earlier thread about that here.
The idea I had was to use the EDIC to assist in engine braking. When the vehicle is started the EDIC pulls the linkage and allows fuel to be pumped into the pistons, but if you disconnect it and gently adjust it forward it starts to cut the fuel to the injectors. How about installing something like the dimmer adjustment for the dash lights to the power of the EDIC motor? you can set it up either off a switch or the brake pedal and find the desired amount by turning the dimmer.
Any suggestions/opinions.
By the way, the reason for this is that since I live in BC and there are a lot of mountains, I put a fair amount of abuse on the braking system. This should help.
Thanks :beer:
 
Also i think you would want to run use a switch (Arm switch) to turn on the fuel/brake, it would run in series with a contact that is closed when the throttle is all the way back. This would activate a relay that would open the circuit that provides power to the EDIC. But there would be a dimmer(rheostat) that would be connected in parrallel. so the power would not be momentarily cut to the EDIC and run through the dimmer when your foot is off the gas pedal.

The first circuit would be seperate:
Ignition power--->fuse--->arm switch--->throttle contact-->relay--> ground.

second : power going to EDIC--< relay contact(normally closed)--->EDIC, The dimmer would be parrallel, connected before and after relay.
 
actually i thought of a more simple way, but you couldnt use a lighted switch, and only if the switch can handle the amperage the EDIC uses.
Just put dimmer pot in series with the wire feeding EDIC, and run a swith and contact(opened when foot is off of gas pedal) both in parrallel.
 
Mat, when you let your foot off completely in essence you are cutting it quite a bit. To get real good braking you want to limit the flow on the exhaust. Like a jake brake.

I think screwing with the edic may wear it out quickly. The relays might not be able to handle all that clicking.

Are you using the brakes now? I generally try to use the engine for almost all the hills I can. downshift as much as you can.
 
Won't work. BB is right, if your foot is off the pedal there is no fuel moving anyway. You can test it by shutting off the key though.

The no fuel situation is actually a problem on rotary pumps since they need some fuel flow for cooling. Long mountain descents can over heat them. You should blip the throttle periodically to cool them.
 
jake brake

I am going to wade in on this. I have a BJ42 that I am rebuilding, live in B.C. and know the mountains personally.
Last week on a trip to vancouver over the coquehalla, my F350 diesel quit 10 min. Kamloops side of the toll booth. Thought it was the cam sensor turned out to be the injector sensor. $ 250. tow back to Kamloops. and $100. deductable as my warranty is still good to replace. I was told $1000. if not under warranty.
The tow truck was a small Hino diesel, did not think he it could pick up my diesel let alone tow it up that hill out of Merrett. No problems. The guy did not even down shift. I would have a couple of times but he laboured it, alot. The engine a hino turbo diesel had over 900 thousand KMS on the original engine. something to consider considing the abuse that it was subjected to in the 3 hours that I was in it.
He had an engine brake and never touched his brakes for the whole trip until he got to Kamloops. He told me his boss replaced the brakes on the truck somewhere around 800 thousand Kms. Something else to think about. If we could apply this to our vehicles, what a break we would get on brakes. pun intended. sorry for the long story but that old truck impressed the heck out of me.
 
wckgitcrazy said:
I am going to wade in on this. I have a BJ42 that I am rebuilding, live in B.C. and know the mountains personally.
Last week on a trip to vancouver over the coquehalla, my F350 diesel quit 10 min. Kamloops side of the toll booth. Thought it was the cam sensor turned out to be the injector sensor. $ 250. tow back to Kamloops. and $100. deductable as my warranty is still good to replace. I was told $1000. if not under warranty.
The tow truck was a small Hino diesel, did not think he it could pick up my diesel let alone tow it up that hill out of Merrett. No problems. The guy did not even down shift. I would have a couple of times but he laboured it, alot. The engine a hino turbo diesel had over 900 thousand KMS on the original engine. something to consider considing the abuse that it was subjected to in the 3 hours that I was in it.
He had an engine brake and never touched his brakes for the whole trip until he got to Kamloops. He told me his boss replaced the brakes on the truck somewhere around 800 thousand Kms. Something else to think about. If we could apply this to our vehicles, what a break we would get on brakes. pun intended. sorry for the long story but that old truck impressed the heck out of me.
Click to expand...

cool! did you get the model of hino and year? Possibly it would be a good source for a small jake brake for the 3b. The ones for sale typically in aftermarket are geared towards the cummins and v8 diesel crowd. Way too big.
 
Well Hino used to make the Toyota diesel, I actually visited them recently in search of a turbo but now even their smallest 4 cylinder engine is larger then the 3B.
In relation to the comment about just taking your foot off the brake, fuel still gets fed into the system (if has to). As a test of this I let the truck idle and took the EDIC linkage off. No difference, then I started to slowly push the lever on the pump forward and the RPMs dropped, that's what gave me the idea. To be honest I did not think of the lubrication end of things. I thought that the pump gets oil fed into it from the engine for that purpose - wrong?
Even when I take my foot off the "gas" pedal, on steep hills like New Westminster, the Coq. the vehicle still accelerates, I am not too keen on slamming it into a lower gear and having it rev up 3200+ RPM.
I did look at the exhaust brake option but this one I though would be cheaper.
So will starving the fuel to the pump damage it? or wear it out quicker?
 
Fantom said:
Well Hino used to make the Toyota diesel, I actually visited them recently in search of a turbo but now even their smallest 4 cylinder engine is larger then the 3B.
In relation to the comment about just taking your foot off the brake, fuel still gets fed into the system (if has to). As a test of this I let the truck idle and took the EDIC linkage off. No difference, then I started to slowly push the lever on the pump forward and the RPMs dropped, that's what gave me the idea. To be honest I did not think of the lubrication end of things. I thought that the pump gets oil fed into it from the engine for that purpose - wrong?
Even when I take my foot off the "gas" pedal, on steep hills like New Westminster, the Coq. the vehicle still accelerates, I am not too keen on slamming it into a lower gear and having it rev up 3200+ RPM.
I did look at the exhaust brake option but this one I though would be cheaper.
So will starving the fuel to the pump damage it? or wear it out quicker?
Click to expand...

The old hino FB trucks had a 3.9 TDI. I don't know if that have anything that small anymore.

Your test was faulty. The fuel rail in your 3B is controlled by the difference on vacuum on either side of the butterfly. At an idle you don't have as much vacuum as you do going down a hill. Your truck effectively does exactly the same thing as you pushing on the lever. That same butterfly gives a tiny bit of engine braking itself but nothing like closing the exhaust does.

Your inline pump is indeed lubed with engine oil. Nothing to worry about ion it. AS Dom says, "they'll pump concrete" Its the aluminum bodied rotary pumps that have trouble. The Cummins guys used to have trouble with them. I don't know if the problem applied to the Denso rotary pumps as well or not.

FWIW grabbing a lower gear and reving to 3200 RPM (or 4200 for that matter) won't hurt your truck any.
 
Check out PAC BRAKE in Surrey. This is what they do.
 
If you find any info on an exhaust brake for us please post it up. This is a mod I would like too.
 
brownbear said:
for sure....but think of it as slowing a 60 series :) one that is heavy on a mountain and has crappy brakes.
Click to expand...

I have some experience with this. I found the 2H pretty darn good at holding itself back on substantial hills without using the brakes. On big hills a tap here and there seemed to suffice. There have only been a couple of occasions where I felt I was on the brakes too much and that was towing a 5000 lb trailer and descending the north side decline into Osooyoos.
 
Mac, I've already sent them 2 e-mails with no response so I am moving down the line to the next place.
Kim, it gets a bit harder to slow down a 60 once it has bigger tires, my problem is that I ussually warp the rotors often. As for the irony, I will be making it faster (turbo), so making it slower will be a nice balance.
Thanks
 
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