Randall wrote:
>> This close to being right?
>>
>
> However, "Jake Brake" is a brand name, and that company offers many newer
> designs that aren't as noisy, so there has been a certain amount of
> controversy on the subject.
>
>
The water-cooled braking referred to was probably a water-powered
retarder, which were commonly attached to the third member on early
trucks, and operated much like a water-powered dynamometer. Today, with
electronic diesel injection, Jakes are often external to the engine--a
strong solenoid actuates a plate that closes off the exhaust, with the
same signal turning on the solenoid shutting off the injectors. The
effect is much the same, and noise, while still considerable, is muffled
by the air cleaner, since the air entering the engine is shunted back up
through the intake.
Most auxiliary braking today is done with retarders on the transmission,
operating somewhat like the old water brakes, but using, instead, ATF
under pressure as the medium between oppositely rotating sets of vanes
at the trans output.
Cheers.
--
Michael Porter
Roswell, NM
Never let anyone drive you crazy when you know it's within walking distance....
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