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Unread 10-19-2007, 07:11 PM   #16
coyote_94yj
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1997 TJ Wrangler 
 
Join Date: Oct 2006
Location: Spokane, Washington
Posts: 349
Quote:
Originally Posted by Toxic TJ
Sorry for the hijack

Martin.

I just bought a new dodge 1 ton 4wd. Killer ride. Anyhow. It came with a factory "engine brake" I've always called them a jake brake. I don't know anything about them. I do know when I hit the button when stoping it is one rumbleing dude. How do they work? Will it make me use more fuel? I hear the turbo rev when I hit it. Is it hard on the turbo? I understand the basics that they save your brakes by using the engine I just don't understand how it works?????? Thanks for your thought!!

Todd
They are sometimes called a jake brake because of a popular brand of exhaust brake "Jacobs". They work by changing when the exhaust valve closes. Instead of the exhaust valve being open during the exhaust stroke it is closed causing compression and slowing the rotating mass inside the engine down inturn slowing the vehicle down. At the end of the exhaust stroke the exhaust valve is opened and the smashed air in the cylinder is released out the exhaust making the loud sound you are hearing. No fuel is injected during this process so...No you are not using more fuel you are actually not using any.

Call me crazy but I would LOVE to have a 5.9L with exhaust brakes in my YJ. It will be real tight and some frame and suspension work is a must but if I got my hands on one I'd be all over it. Don't know much about the size of your 6.7L but that would be insane. Probably not gonna fit.

My

Chris

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Unread 10-19-2007, 07:34 PM   #17
krausec
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1992 YJ Wrangler 
 
Join Date: Oct 2007
Location: canada
Posts: 3
Thanks todd. Was kinda planning on goin with axles out of a toyota. I've seen them handle chevy power with 37 inch swampers, with little problem. But then again thats just what i've seen. I have a 350 tranny already (thanks for the suggestion though).
I also like the toyota axles cause of the smaller pumkin. Any thoughts?
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Unread 10-19-2007, 08:00 PM   #18
TrailWorthyFab
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2005 TJ Wrangler 
 
Join Date: Jan 2007
Location: WICHITA, KANSAS
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Ya...You don't want to hear it. Sell the toyota Axles. For the amount of work they are not worth it. As they are too narrow. Look for some dana 44's or 60's out of a 3/4 or 1 ton. Then you will have the Width to support one killer build. The 350/350 combo will be fun. Is your engine Fuel Injected or TBI or carbed? What T case do you plan on running? You should be able to sell the toyota axles pretty easy as a lot of suzuki guys like them for their sammies. Low and wide. That is the stance (if I were you) I'd be looking for. Fire away with more questions. By the way. What gears are in the Yota axles?

Todd
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Unread 10-19-2007, 08:02 PM   #19
TrailWorthyFab
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Quote:
Originally Posted by coyote_94yj
They are sometimes called a jake brake because of a popular brand of exhaust brake "Jacobs". They work by changing when the exhaust valve closes. Instead of the exhaust valve being open during the exhaust stroke it is closed causing compression and slowing the rotating mass inside the engine down inturn slowing the vehicle down. At the end of the exhaust stroke the exhaust valve is opened and the smashed air in the cylinder is released out the exhaust making the loud sound you are hearing. No fuel is injected during this process so...No you are not using more fuel you are actually not using any.

Call me crazy but I would LOVE to have a 5.9L with exhaust brakes in my YJ. It will be real tight and some frame and suspension work is a must but if I got my hands on one I'd be all over it. Don't know much about the size of your 6.7L but that would be insane. Probably not gonna fit.

My

Chris
Thanks a lot Chris!!!
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