To make matters yet more complicated, I drive a CA version 1985 300TD with the trap oxidizer, deigned to reduce emissions (soot). How does this factor into the equation?
On Fri, Jul 15, 2011 at 11:10 PM, Peter Frederick <psf...@earthlink.net>wrote: > The amount of fuel injected on mechanically governed engines is controlled > by the governor (inside the IP as a rule) along with a mechanical over-ride > to permit max fuel when the governor doesn't "think" it's needed. On > electronically controlled engines, it's the computer. Diesel engines will > NOT run reliably at low speeds or idle without a governor, it's almost > impossible to manually control the fuel delivery well enough since it's just > a tiny, very short duration squirt at TDC or a bit before. > > To get the correct fuel/air ratio under load, there must be a metering > system that measures the air induction rate, either a flow meter or a > pressure transducer correctly calibrated. > > Black smoke indicates overfueling, but it will also result from incorrect > injection timing -- this is very evident in older US made diesels of all > kinds due to the use of fixed injection timing set for correct timing at > around 2000 rpm. Very much deviation from that rpm and the timing was > seriously off -- which means under load as the gears are changed a huge > cloud of black smoke from too early injection (and the horrlble sound of the > engine knocking very badly) is produced until the rpm gets up to 2000. Mack > and Screaming Jimmes were the worst, but they are all bad about it. Easy to > tell the ones with variable timing -- not only are they quiet, but no smoke. > > All new engines have soot traps, and so smoke isn't usually visible. > > Peter > > > ______________________________**_________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives > http://www.okiebenz.com/**archive/<http://www.okiebenz.com/archive/> > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/**mailman/listinfo/mercedes_**okiebenz.com<http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com> > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
