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

[Erik Lane]

but that's not my point. i have no argument that the
intake restriction has a major contribution to gasser
engine braking, just questioning gas vs. diesel.
that's just one component of the gasser side of the
equation.

i still really question the assumption that mercedes
put a throttle valve in the intake for the purposes of
engine braking. i can't imagine a car company caring
that much about something like that. to my mind it
would have something to do with the engineering of the
running of the engine under other conditions and that
was the solution that they came up with. i would think
that the engine braking would just be a happy side
effect.

a beer sounds good! (had one earlier that's been out
in the shop and it was funny. a minute after i opened
it there was a bunch of slush in it. but not right
away. this is in sub freezing weather and is the first
time i've ever seen that.)

erik
--- 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.
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