Richard Notton schrieb:
>
> ----- Original Message -----
> From: "Jim Newton" <jnewton@laurel.com>
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Sent: Friday, October 05, 2001 5:45 AM
> Subject: [MV] "Jake Brakes" Possible on an M35?
>
> Its simpler than you think, just a butterfly valve in the
> exhaust manifold usually operated by an air cylinder from
> the vehicle brake supply.
Korrekt.
> It is the nature of a diesel injection pump governor that
> no fuel is injected when the revs are higher than the demand
> from the "gas" pedal, when you lift off on a diesel there is
> no fuel injected until the engine slows to the set idle revs.
Not correct. The exhaust brake has usually a connection to the
injection pump. Most times another small air cylinder switches
the injection pump to "cut off" position. So as long as the
butterfly valve in the exhaust pipe is closed, the injection
pump will deliver no fuel to the cylinders.
Without this "cut off" device, the injection pump will always
deliver the amount of fuel which is needed for idling speed.
Even this small amount of fuel will produce big clouds of
smoke, when the exhaust valve is closed. (The exhaust valve
is never completly close, there must be always a small bypass)
The butterfly valve is not located in the exhaust manifold,
it is located in the exhaust pipe around 1 meter (yard) behind
the engine. At that location the exhaust gases are colder and
the butterfly valve lasts longer.
Best regards
Andreas
This archive was generated by hypermail 2b29 : Fri Dec 07 2001 - 00:36:24 PST