[Vwdiesel] Brakes --- engine brakes -- ( The physics of it ).

Roger Brown r.c.brown at ieee.org
Tue Jan 6 20:47:19 EST 2004

W3wjr at aol.com wrote:
> You forgot one thing to do in this test.  As you go down the hill in the
> Diesel, you have to run a test where you shut off the intake manifold to see how
> much of a difference that makes in braking.  That is what the butterfly inside
> the carb/fuel injection does in a gasser.
> In a message dated 1/6/2004 2:25:09 PM Eastern Standard Time,
> h_hagar at prcn.org writes:
> Physics tells us that is MOSTLY   myth.    Do a test as follows and
> you will be convinced.Use a "calibrated hill"  (Val). Start test at top of
> hill
> with the fuel off. ---Check max speed going down.
> Then do it again with fuel on .    If braking is a lot less  with fuel on,
> reset idle and
> fueling screws a tad towards less idle rpm and less fuel.

I initially thought you could rig up a switch to shut off the fuel cut-off solenoid on the pump, but I guess that wouldn't be a good idea since I assume the pump is lubricated/cooled by the fuel and it would run dry pretty fast with the input feed cut


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