Hzj (1hz) Engine braking

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Holstebro, Denmark
We are travelling from Europe to Australia and are now encountering so e pretty large mountain road with some very long downhill stretches.

I really wish we had more engine brake.


Is a lot of engine braking bad for the engine? I do not have a rpm measure but we try to stay under 4 bar oil pressure.

This does however also takes a lot of pressing the brakes.


What do you do?


I was looking into exhaust brakes and it is possible to get an aftermarket exhaust brake



What do you think.. would that be a good idea.. would it stress the engine more than normal engine braking?




Esben

www.instagram.com/Lessismorememories
 
I go up and down a 2000 ft. hill every day, multiple times, in my troopy. 3rd gear is my magic gear going downhill, 2nd for any hairpin turns, and the 1HZ is fine and happy. The biggest difference maker for me, to feel much more in control, and not have to stomp on the brake pedal, was doing the complete Terrain Tamer brake upgrade: double diaphragm brake booster, steel mesh lines, calipers, etc. One of the best changes i've made. It turns your brakes from sketchy 1970's tech into something that feels just... normal. Something to think about in the future. For now, I guess use those brakes and engine together and maybe stop once in a while to cool down and avoid any brake fade. Sounds like a humdinger of a trip, have a great one.
 
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I go down 1500ft curvy hills mostly in 3rd or 2nd in my 2h often, same gear box as hz. Fair bit of it is muddy with ruts and pot holes. A bit slow but that is fine as there are wallabies, wombats, echidna, sometimes koala and deer. Always glad I am not going fast for these fellows. Not very high by European standards. The log trucks use engine brakes all the time, noisy as, they don't care about hitting animals. Often the wedge tail eagle is eating the logger's road kill, the eagles are slow to get in the air being so big. I estimate the loggers are paid piece rate.
Is there a hurry for you?
 
Sorry for the high jack! Joeys are drop dead gorgeous, good incentive to come on over mate.
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😁
 
We are travelling from Europe to Australia and are now encountering so e pretty large mountain road with some very long downhill stretches.

I really wish we had more engine brake.


Is a lot of engine braking bad for the engine? I do not have a rpm measure but we try to stay under 4 bar oil pressure.

This does however also takes a lot of pressing the brakes.


What do you do?


I was looking into exhaust brakes and it is possible to get an aftermarket exhaust brake



What do you think.. would that be a good idea.. would it stress the engine more than normal engine braking?




Esben

www.instagram.com/Lessismorememories
I ran an exhaust brake for a while in one of my trucks for when I pulled a 5th wheel through the mountains. They are pretty effective, usually providing around 50-60% total engine HP as braking HP. (IE - 300HP engine grants ~160 braking HP)

You are simply creating a back pressure/compression stroke during the exhaust stroke. Does this cause additional wear on the motor? Sure, but it is minimal when considering what these motors put up with during normal use. Simply keep an eye on RPM's going downhill and don't let it get out of hand.

Exhaust brake is also easy to install, and otherwise leaves the engine alone, which is good. The 1HZ head is not designed for a proper engine brake integrated with the head, so really the exhaust brake is the only viable option in this case.

:cheers:
 
so really the exhaust brake is the only viable option in this case
i agree with what rister says. I have one installed as I'm in Peru and do 16,000 ft descents all the time.. i love it for mountain hway driving. there was a thread you may have seen where i talk about it in detail, i can't remember if it was my thread or someone else's. as far as i can tell the engine loves it, because without it the down-changes are often more abrupt requiring more clutch, so with essentially the extra gear in between each gear you can engine brake smoother if that makes sense
 
I can't say I've ever had the feeling my iHZ got ill from a long descent. That said, it would be nice to be able to switch up one gear on a long descent now and then - and that's where an exhaust brake could come in handy.
Can anyone recommend a kit to look out for? Does anyone have a price indication?

Aside from that, I am quite content with the freewheeling hubs. On numerous occasions theay allow me to use low gear to engine brake, even on super steep tarmac or concrete descents. I hardly ever have to use the brakes in any descent.
 
I have been looking at this kit from Australia



This is an email I got from Gearing Dynamics:
We don’t make our exhaust brake for specific models – Our kit is universal. Below is some information that you should read to see if our Exhaust Brake Kit is right for your application. Application suitability will be depend on what emissions equipment is fitted to your vehicle.

The exhaust brakes are compatible with most Diesel Engines including turbo’s, however there are some things to be aware of that are outlined below. Our kit is fairly basic and is primarily intended for the international mining industry but can be installed on most diesel engines with either 2.5” or 3” exhaust systems. Our standard kits are for single exhaust systems. Dual exhaust kits are extra.

Installation location must be before any mufflers, resonators or flex couplings in the exhaust pipe, and as close to the turbo/exhaust outlet as practical. The better the exhaust pipe is sealed (Before the Exhaust brake), the more efficient it will be in use.

You may have to modify the supplied Clutch and Accelerator micro-switch brackets to suit your vehicle.

Pricing for exhaust brake kits is as follows:

1. 2 ½” 12 Volt – AU$1850.00 + GST + Freight

2. 3” 12 Volt – AU$1950.00 + GST + Freight

The above prices are for a single exhaust system. The price does not include fitting and we do not fit them.

Freight cost is AU$30.00 for any location within Australia. International rates vary by location.

There are some things to be aware of. Some may not be relevant to your application:

1. If the vehicle has a DPF, you will need to do a DPF delete – No parts are included in the kit for doing this.

2. If the vehicle is a turbo, you will need to do an EGR delete – No parts are included in the kit for doing this.

3. Exhaust Brakes don’t work well on Automatic Transmission Vehicles unless you manually select a lower gear.

4. The exhaust brake should never be installed after a flexible section of the exhaust pipe

5. The Exhaust brake should be turned off when it is not required. They are designed primarily for long descents and heavy towing purposes and should not be used as general brake assistance.

6. If the vehicle has any exhaust gas sensors, the exhaust brake may cause the check engine light to come on. To fix this, you would probably need to get your engine re-mapped.

Some of the above modifications will make your vehicle unroadworthy. We do not condone modifications of vehicles that make them unroadworthy – They are shown in the list above so that customers are aware of some of the caveats of installing the Exhaust Brake System.

In general, we do not recommend fitting our Exhaust Brake Kit to later models vehicles with a lot of emissions equipment fitted. Doing so will mean that you have to remap the ECU, which can be expensive.

Note that there is currently around 2 – 3 weeks lead time required on al Exhaust Brake Kits.



Regards,

Dwane O’Dwyer
Manager


GEARING DYNAMICS
26 Hume Reserve Court,
Bell Park,
Vic 3215
Australia



Ph: 0484 377 087



**** Note: Any prices quoted are in Australian Dollars







www: Gearing Dynamics - Land Cruiser Driveline Technology - http://gearingdynamics.com



FaceBook: Gearing Dynamics | Geelong VIC - https://fb.me/GearingDynamics1

Instagram: http://instagram.com/gearing_dynamics



From: Gearing
 
Here is the installation manual attached
that's the one i have fitted for about 10 years I think.

If anyone orders one (i don't recommend for most people unless you do a ton of hway descents), i recommend getting an extra spring for the butterfly valve. I ordered an extra one and already replaced it due to rust when i had it parked up fro a while. i also ordered an extra microswitch... none of those failed so i would say not necessary, but as luck would have it a guy doing my floor upholstery around the pedals a year ago destroyed one of them. Those are the only replaceable/breakable items worth having a spare for that you won't find easily.
 
I can't say I've ever had the feeling my iHZ got ill from a long descent.
yeah i think the 1HZ loves engine braking, with or without an exhaust brake. I certainly wouldn't install an exhaust brake out of fear for damaging the motor. I only did it for drivability.
 
Look at exhaust brakes for 12v/24v cummins, they are heavily used and also installed from factory on late model rams.

These are heavily used to slow when hauling freight - it is imperative as no brake system is capable of slowing heavy trucks down on grades. For a 1hz it's no different so slap one on and keep moving, they are great!
 

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