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Jacobs/Exhaust brakes on a Landcruiser??
Moderators: toaddog, TWISTY, V8Patrol, Moderators
Jacobs/Exhaust brakes on a Landcruiser??
Got a mate askin bout whether its possible or not and how to go about getting a setup for the cruiser.
Its just a 2.5" zorst has anyone done it or know something bout it?
Speaking uneducatedly i would say no to jacobs, but im sure we could find a zorst valve brake?
Cheers
Its just a 2.5" zorst has anyone done it or know something bout it?
Speaking uneducatedly i would say no to jacobs, but im sure we could find a zorst valve brake?
Cheers
Get out there!!
another thing to consider is wether or not the valves will burn out holding the extra heat/exhaust back.
maybe not as simple as bolting an exhaust brake set up on it. You will have to run a bit of electrics to control the pedals so its not always on when you use the clutch, accel, change gears, etc.
Then there is also the factor as to how well it will actually perform V's $$ cost. there arent many exhaust brakes that are half decent in small trucks. If you thinking of using it for towing,etc. Just get elec brakes on the trailer.
I hope i am wrong, i'd love to have one on my patrol, esp with a free flow exhaust.
maybe not as simple as bolting an exhaust brake set up on it. You will have to run a bit of electrics to control the pedals so its not always on when you use the clutch, accel, change gears, etc.
Then there is also the factor as to how well it will actually perform V's $$ cost. there arent many exhaust brakes that are half decent in small trucks. If you thinking of using it for towing,etc. Just get elec brakes on the trailer.
I hope i am wrong, i'd love to have one on my patrol, esp with a free flow exhaust.
Road Ranger
http://en.wikipedia.org/wiki/Jake_brake is why one on a cruiser may prove problematic
but you may be able to make one of these work on it with a bit of a think
http://www.jakebrake.com/technology/exhaust.php
either that or one off a small bus or truck using the same engine or similar size engine
but you may be able to make one of these work on it with a bit of a think
http://www.jakebrake.com/technology/exhaust.php
either that or one off a small bus or truck using the same engine or similar size engine
If the above post did not offend you in any way please PM me so I can try harder!!
i put an air operated exhaust brake on 2 diesel engined 4wd's, a Mercedes benz Gaelanden Wagen and a 47 series land cruiser.
The brake was only effective at very low speed, hence low range, where it made a significant difference to forward speed. I would say it slowed the venicle down 100% if applied in first low range and held it at that speed. Trying to use it at say normal 60klm/hr and above speed to slow the vehicle down was hopeless. I would say the effective upper speed limit was 15 klm/hr.
I first purchased a unit from the wreckers, then ended up building a couple of units - all 'mechanically possible' - but only of real benefit in first or second low range.
The jakes brake is a totally different system and yes, it slows big masses down, but a simple butterfly valve with a 3mm hole for pressure relief - not worth the effort. I ended up ripping mine off. Remember. you are trying to slow a mass down with a compressible medium, and it is not very effective.
I might have a unit under the bench you can have to play around with - let me know, happy to donate it.
The brake was only effective at very low speed, hence low range, where it made a significant difference to forward speed. I would say it slowed the venicle down 100% if applied in first low range and held it at that speed. Trying to use it at say normal 60klm/hr and above speed to slow the vehicle down was hopeless. I would say the effective upper speed limit was 15 klm/hr.
I first purchased a unit from the wreckers, then ended up building a couple of units - all 'mechanically possible' - but only of real benefit in first or second low range.
The jakes brake is a totally different system and yes, it slows big masses down, but a simple butterfly valve with a 3mm hole for pressure relief - not worth the effort. I ended up ripping mine off. Remember. you are trying to slow a mass down with a compressible medium, and it is not very effective.
I might have a unit under the bench you can have to play around with - let me know, happy to donate it.
Road Ranger
I am used to engine brakes and retarders on larger trucks and busses so zaust brakes on small trucks have never excited me in terms of their effectivness, that said they do make a reasonable difference to the run off on hill, and have found they do allow you to grab the brake a little later on steeper hills and allow you to just foot off throttle on small declines where you would otherwise be feathering the brake.PBBIZ2 wrote:i put an air operated exhaust brake on 2 diesel engined 4wd's, a Mercedes benz Gaelanden Wagen and a 47 series land cruiser.
The brake was only effective at very low speed, hence low range, where it made a significant difference to forward speed. I would say it slowed the venicle down 100% if applied in first low range and held it at that speed. Trying to use it at say normal 60klm/hr and above speed to slow the vehicle down was hopeless. I would say the effective upper speed limit was 15 klm/hr.
I first purchased a unit from the wreckers, then ended up building a couple of units - all 'mechanically possible' - but only of real benefit in first or second low range.
The jakes brake is a totally different system and yes, it slows big masses down, but a simple butterfly valve with a 3mm hole for pressure relief - not worth the effort. I ended up ripping mine off. Remember. you are trying to slow a mass down with a compressible medium, and it is not very effective.
I might have a unit under the bench you can have to play around with - let me know, happy to donate it.
They will not perfore miracles, but they certainly have a place imo, although I am not sure I would be going to any kind of trouble to retrofit to a 4wd, but otherwise happy to use on fitted on a small truck in cases where I am unfortunate enough to be driving one
If the above post did not offend you in any way please PM me so I can try harder!!
Holding heat in isn't a problem. Switch on the accelerator and clutch is all you need.
No accelerator means virtually no heat to hold in.
If you retrofit a brake off a bigger engine, then it will bypass too much gas to be useful. You'll need to find the hole the gas gets through and make it smaller.
Too small and you'll float the exhaust valves, but on a turbo engine you should be able to make around 30psi without trouble.
No accelerator means virtually no heat to hold in.
If you retrofit a brake off a bigger engine, then it will bypass too much gas to be useful. You'll need to find the hole the gas gets through and make it smaller.
Too small and you'll float the exhaust valves, but on a turbo engine you should be able to make around 30psi without trouble.
Temporary Australian
The exhaust brake on the 3.5t (4.2 turbo diesel) canter that i drive does a good job of holding speed down hills, never driven a truck with jake brake so can't compare but i do find on downhill runs in my ute i sometimes find myself going for the exhaust brake as a habit from the truck.
I was led to believe that when coasting diesels run little to no fuel thru the engine, i don't know if this is true but would mean that the only heat created would be the compression of the intake air
I was led to believe that when coasting diesels run little to no fuel thru the engine, i don't know if this is true but would mean that the only heat created would be the compression of the intake air
With no throttle input, the injectors/pump are effectively at idle so yep, very little fuel going in.muckute wrote:The exhaust brake on the 3.5t (4.2 turbo diesel) canter that i drive does a good job of holding speed down hills, never driven a truck with jake brake so can't compare but i do find on downhill runs in my ute i sometimes find myself going for the exhaust brake as a habit from the truck.
I was led to believe that when coasting diesels run little to no fuel thru the engine, i don't know if this is true but would mean that the only heat created would be the compression of the intake air
The gearing dynamics one as suggested was what i remembered, hdj105 also from memory used to have an exhaust brake fitted to his 1hdt from a coaster/dyna truck.
Cheers,
Dan.
[i]1996 HDJ80R[/i]
Dan.
[i]1996 HDJ80R[/i]
You wont get the noise from a simple butterfly valve i the exhaust.tommy182 wrote:but guys far as im concerned your all missing the point the NOISE hahah it would be great but as far as actually doin it, way to much effort....
The noise you hear from trucks is the jake brake, as pointed out is very different.
http://www.mothfukle-engineering.com/
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