http://www.jakebrake.com/products/engine/theory.htm
The Jake Brake isn’t an exhaust brake, it’s an engine brake. The exhaust system remains open. The Jake Brake introduces a high volume of air into the cylinders to create back pressure, and I would guess that the loud rapping noise is produced by the sudden release of that air each time the exhaust valves open.
Jacobs does make an exhaust brake, which is called the Extarder:
http://www.jakebrake.com/products/exhaust/theory.htm
I would guess that true exhaust brakes are a lot quieter than Jake Brakes (?).
Don
http://www.google.com/search?q=jacobs+brake+theory
From: jim clark <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Date: Sun, 10 Jun 2001 12:16:38 -0500
To: Multiple recipients of VACList <[EMAIL PROTECTED]>
Subject: [VAC] Re: Exhaust brakes -/ Jake Brakes
I would have thought blocking the exhaust would make the diesel quieter... can someone straighten my convoluted understanding of this brake system??
