Exhaust smoke question.... - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 04-03-2008, 02:54 AM Thread Starter
 
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Exhaust smoke question....

ok so i want to clear up all the exhaust smoke stuff that ive been wondering about FOREVER! haha. so i want to know what these mean and if its good or bad:

black smoke
THICK black smoke
grey smoke
whitish smoke

after my little IP mishap, my truck seems to smoke more black, but top end it clears out and kind of hazes light grey smoke. What does this mean and could turning the diaphragm in my IP cause me high EGT's? thanks again,

Nick
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post #2 of 5 (permalink) Old 04-03-2008, 01:03 PM
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#1.black smoke,Fueling heavy, building manifold pressure and heat, EGT's climbing.
#2.THICK black smoke, the heavy clouds that seam nearly grayish is generally too much fuel, EGT's climbing fast if not enough air for fuel.
#3.grey smoke, little unburnt fuel, good combustion of fuel
#4.whitish smoke, cold start, advanced timing or possibly water

EGT's can be an issue for any truck under any smoke conditions. A poor set of injectors on stock IP settings can tip the TEMPS into the red. A pyro is the only safe way to play without paying too much in the end. I suggest you get guages if you havenn't already, cause every truck is a little different.

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post #3 of 5 (permalink) Old 04-03-2008, 01:58 PM Thread Starter
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so what does cranking the starwheel actually do?
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post #4 of 5 (permalink) Old 04-03-2008, 03:40 PM
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Allows the IP to fuel harder on less boost. Boost pressure from the line on the back of the pump cap pressurizes the top of the IP, forcing the diaphram and fuel pin down, allowing more travel in the the afc lever. The starwheel is a base line adjustment for boost referenced fueling.

If you pull the fuel pin out you will see a whitness mark on the face of the conical area of the pin, there is a small pin (looks like a needle bearing) inside the hole where the fuel pin was at. This small pin rides on the fuel pin for a fueling reference, hence the mark left on the fuel pin. The fuel pin can be ground to a more aggressive profile for more small pin travel and advanced fueling.

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post #5 of 5 (permalink) Old 04-14-2008, 02:51 AM
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Quote:
Originally Posted by XXXcumminsXXX
so what does cranking the starwheel actually do?
More you screw the starwheel upwards the tighter the spring becomes. This is turn requires much more boost to start fueling... But if you screw the starwheel down towards the pump this give more slack to the spring causing more fuel earlier on. So it requires much less boost pressure to get extra fuel...

As for the grinding the pin it really does change the performance quite fast! :evil:

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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