But Ben, Wouldn't the compression release braking be more effective in a lower gear? Larry A.
On Sat, Sep 14, 2013 at 1:55 PM, Ben <syncro@gmail.com> wrote: > On Sep 14, 2013, at 8:37 AM, Don Hanson <dhanson928@GMAIL.COM> wrote: > > > That is why we encounter very slow trucks on the downhills > > as well as the climbs....They've shifted to a low enough to hold their > > trucks from gaining speed...and thereby they can control the heat they > > create with their brakes..... > > > If this statement is about very large trucks such as diesel rigs, this > would be less than an accurate statement. Excerpt taken for Wikipedia which > is accurate enough for this discussion. > > "Diesel engines do not have engine braking in the above sense. Unlike > petrol (gasoline) engines, diesel engines vary fuel flow to control power > rather than throttling air intake and maintaining a constant fuel ratio as > petrol engines do. As they do not maintain a throttle vacuum, they are not > subjected to the same engine braking effects." > > So, NO. Those trucks are not downshifting to slow down. They are using > alternative mechanisms such as jake brakes. Ever notice that the diesel in > your Vanagon & other VW's have an auxiliary pump to create vacuum for your > brake booster? Same deal. > > > > BenT > |
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