Engine Brake not recommended for 7.3L ??? - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 6 (permalink) Old 09-04-2008, 03:13 PM Thread Starter
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Engine Brake not recommended for 7.3L ???

I have been looking into the DIY exhaust brake and came across the info below from Jacobs Vehicle System (Jake Brake manufacturer) about putting a butterfly type brake on the 7.3L. Now I'm confused. I know Jacobs is a reputable company and they work directily with Navistar, but don't other reputable manufacturers of engine brakes (banks, pac, bd...) work with Navistar as well?

Here is the site: Jacobs Vehicle Systems - Frequently Asked Questions


Do you make a product for the Ford 7.3L Powerstroke or Navistar International T444E engines?


No, Jacobs does not offer an exhaust or engine brake for these engines in fact, Navistar and Ford have requested that we do not develop one for these engines.
The primary concern with putting a retarder on these engines is their use of hydraulic lifters. Most engines with hydraulic lifters have fairly low exhaust back pressure limits so the performance of an exhaust brake would not be substantial. More importantly the use of an exhaust brake on an engine with hydraulic lifters can cause engine damage. The problem is that the increased back pressure resulting from the operation of the exhaust brake will cause some degree of valve float. This valve float can cause the hydraulic lifter to re-set with the valve still open (not seated). This phenomenon is known as lifter jacking. Lifter jacking could also result if a traditional engine brake were used on these engines. The results of lifter jacking can be anything from low positive power (because the valves stay open) to engine damage caused by valve to piston contact.

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post #2 of 6 (permalink) Old 09-04-2008, 06:25 PM
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That is for a JAKE brake. Don't confuse a Jake brake with an exhaust brake, a jake is somehow built into the engine, an exhaust brake goes after the turbo. I had the DIY Exhaust brake on my old 02 and loved it except for the delay it had. If you want a good real one for towing go with a BD Exhaust Brake.

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post #3 of 6 (permalink) Old 09-04-2008, 06:43 PM Thread Starter
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It sounds like Jacobs makes both exhaust and engine brake products. The Jacobs engine brake opens an exhaust valve at piston TDC, while the exhaust brake is a butterfly valve in the exhaust. Jacobs does make a light duty exhaust brake, but only for the dodge cummins engine. I guess the first sentence of Jacobs Answer was the only thing that got me thinking and wondering - the fact that they won't develop either the exhaust or engine brake. I guess with so many exhaust brakes out there, I haven't heard of ANY failures of 7.3l engines due to these exhaust brakes, so I guess I'm not really worried.

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post #4 of 6 (permalink) Old 09-05-2008, 12:29 PM
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I have had a BD exhaust brake on my truck for seven years. I use it everytime the rig is moving. I have never had a problem of any kind. When I tow, I am at 20,000lbs GCW and I live in the hills. (mountains) My original service brakes are less than 25% worn. It was one of the best investments I have made. In combination with the ZF6, IMHO, it can't be beat to control speed on the hills.

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post #5 of 6 (permalink) Old 09-06-2008, 07:01 PM
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Jacobs is quoting the Ford party line. Ford has made it loud and clear that any exhaust brake of any kind will immediately void the Ford warranty on your engine. For your Y2K model, that message was broadcast to all dealers, and I've quoted it several times over the years. By the 2001 model year it was included in the PSD Supplement to the Owner's Guide. So it's real clear where Ford stands.

But there have been thousands of exhaust brakes installed on '99-up 7.3L diesels, both "real" exhaust brakes and the "electronic" type that uses the EBP valve, and I've not heard of even one case that the exhaust brake hurt the engine in any way. But Ford still hasn't changed their stance.

I haven't needed more braking power on my rig. My truck was used mostly for dragging my 5er around the lower 48, across every mountain range at least once, and my OEM brake pads lasted over 100,000 miles. But a few months ago I thought I'd try one, so I bought the SP-Diesel exhaust brake and torque converter copntroller ( www.sp-diesel.com ). It works great, but I haven't towed with it yet. I plan on a several-hundred mile towing jaunt in early October to attend the NTPSD rally east of Dallas, so I'll give it a workout on that trip. There's one good hill on I-20 called Ranger Hill that will let me know if it works good or not.

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post #6 of 6 (permalink) Old 09-07-2008, 02:16 PM
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I have an exhaust brake on my DP Tuner that used the OEM exhaust valve. I only towed with it once, but I like it. It was only an extra $25 or something in the DP Tuning program.

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