Does Power Service Reduce Black Smoke

[Begle1]

I've had my pump tweaked for a few tanks... First tank I had a full shot of Power Service and I could drive it without making any smoke, then I noticed a bit more smoke when I filled up again. After I filled up again and further diluted the additive out of there, it's not driveable without smoke.

Are the pump adjustments loosening up, is the additive what makes a difference, or am I just getting more comfortable with the truck?

Would higher cetane make less smoke? That'd explain why biodiesel doesn't like to smoke as much?

[Greenleaf]

I run a very heavy dose of PS and I have tons of black smoke. I use 12 oz per 15 gallons of diesel.

[Begle1]

But do you get more black smoke if you don't use it?

If high cetane reduce black smoke, I don't understand why... I'd think that if it starts burning sooner, then it burns more, but then why doesn't biodiesel smoke as bad...

[Greenleaf]

I never not used it. I have been mixing it with 2 cycle oil now. I probably won't try it with out one or the other..... or both.

[mhuppertz]

I think it smokes less with Power Services (properly dosed).

[Begle1]

But why?

According to their literature, the stuff adds lubrication to the fuel, cleans the fuel system and increases cetane. Any affect would probably come from the increased cetane affect, which would also account for why biodiesel doesn't smoke as much.

Ohhhhhhhhh.... Looky what I found.

http://en.wikipedia.org/wiki/Cetane_number

Fuels with higher cetane number which have shorter ignition delays provide more time for the fuel combustion process to be completed.

So cetane number works the opposite from octane number. Wheras high octane number means the fuel waits to burn, a high cetane burn means that the fuel does burn sooner.

So the more time to burn, the more fuel that burns, the more power, the less unburned fuel, so the less afterburning, and the lower EGT's.

[mhuppertz]

But why?According to their literature, the stuff adds lubrication to the fuel, cleans the fuel system and increases cetane. Any affect would probably come from the increased cetane affect, which would also account for why biodiesel doesn't smoke as much.
Ohhhhhhhhh.... Looky what I found.
http://en.wikipedia.org/wiki/Cetane_number

Fuels with higher cetane number which have shorter ignition delays provide more time for the fuel combustion process to be completed.

So cetane number works the opposite from octane number. Wheras high octane number means the fuel waits to burn, a high cetane burn means that the fuel does burn sooner.

So the more time to burn, the more fuel that burns, the more power, the less unburned fuel, so the less afterburning, and the lower EGT's.

By Jove, I think you've got it!

Higher Cetane burns faster, so the timing can be retarded and less energy is wasted on the upstroke of the piston and less fuel comes out of the exhaust port still on fire. This equals less boost, but more efficiency.

[Begle1]

Nooo....

Higher cetane fuel starts burning sooner, which results in a longer and more complete burn over a larger portion of the power stroke.

Thus less wasted fuel, which leads to lower EGT's and therefore less boost.


So how many degrees before or after TDC do our injectors start to fire?

[charger 69]

I think it smokes less with Power Services (properly dosed).

what is the proper dose for a full tank as I haven't done the math yet?

[charger 69]

I think it smokes less with Power Services (properly dosed).

what is the proper dose for a full tank as I haven't done the math yet?

[Begle1]

According to the bottle, 3-6 ounces per 10 gallons.

32 gallons to the tank, so from 10-20 ounces...

[dpuckett]

Static timing is in the 13-18deg BTDC range, depending on where it is set (1.25-1.8mm @TDC). Greenleaf has said you get around 27deg total advance at full power.

Daniel