Eric Aldinger
To Molly's point, not all excess exhaust is intentional not due to a mod. I
ride around a lot of diesel trucks that belch exhaust as the accelerate to
safely pass me. Having someone with a coversion blow extra exhaust, as seen
on youtube, is very different. Having driven poorly maintained very large
diesels, I can say they always have a nonzero volume of smoke when you you
gun it.
I have found pulling over and letting large vehicles pass without having to
accelerate has reduced conflicts 90% for me in rural communities and in the
West Hills.
On Mar 21, 2016 3:56 PM, "Rick Johnson via OBRA" wrote:
> That's confusing a deliberate modification with poor mechanical condition
> - it's not the same thing.
>
> An old diesel can have excess engine oil consumption due to several
> factors. Worn piston rings will result in blow-by and excess crank case
> pressure which is typically vented back to the air intake. This will occur
> under conditions of high engine load. Worn vale seals will likewise allow
> engine oil into the air intake, this will happen under high vacuum
> conditions such as coasting down a grade. In both cases the smoke will have
> a clearly discernible blueish tint. It's not something to be proud of -
> professional drivers recognize it for what it is - a sign that your engine
> is ready for a rebuild.
>
> "Rolling Coal" is an abnormally rich fuel condition, exhibited by dark
> black sooty smoke, that can only be created by modifying the fuel system.
> Pre-EFI the modification required changing the mechanical fuel pump
> pressure or timing. Since the advent of Electronic Fuel Injection it can
> only be done by modifying the engine controller programming. Which as well
> as being inefficient is a violation of both the manufacturers warranty and
> federal law.
>
> Rick Johnson
> Bend, Oregon
>
> On 3/21/2016 2:18 PM, Molly Cameron via OBRA wrote:
>
> Yes, you can modify a diesel to effectively roll coal and that has gotten
> press attention. But it is not required. Particularly on older vehicles
> more than a few years old with the latest emissions equipment.
>
> Forgive me for using absolutes like "every" and "always".
>
>
> On Mon, Mar 21, 2016 at 1:25 PM, Rick Johnson
> wrote:
>
>> Sorry Molly, you are clearly mistaken on this. Smoke is NOT a normal
>> byproduct of a properly running diesel engine.
>>
>> This is what people are referring to:
>>
>> http://dailycaller.com/2014/07/10/smoke-responsibly-and-roll-coal-the-right-way-with-these-truck-modification-options/
>> http://www.dieselhub.com/tech/smoke-responsibly.html
>>
>> Rick Johnson
>> Bend, Oregon
>>
>>
>> On 3/21/2016 1:02 PM, Molly Cameron via OBRA wrote:
>>
>> I've seen it written that "rolling coal" requires a modification (which
>> may be illegal) to equipment. That is incorrect. When any diesel vehicle's
>> operator presses the accelerator pedal all the way to the floor quickly it
>> will spew black smoke out of the exhaust.
>>
>> One does not have to modify an automobile or equipment to "roll coal" in
>> any diesel vehicle. Its a stock feature. Sometimes it is an after-effect of
>> a driver accelerating just to get around cyclists, sometimes it is
>> intentionally mischievous as one has to "floor it" to get the desired
>> effect.
>>
>> A small clarification for everyone on that. It does not need an
>> intentional equipment modification, it is simply action on the part of the
>> operator.
>>
>> MC
>>
>>
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>>
>
>
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