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#4536052 - 10/07/17 09:31 AM Is Zinc a "carbon promoter"?
Speak2Mountain Offline


Registered: 04/07/17
Posts: 347
Loc: Mississippi
Read this: "Further to what has been said, the type of engine oil used and the fuel you choose to run the car on make a massive contribution to carbon build up."

"Older 'classic'oils, (especially the monogrades, but anything with an SAE rating of SF-CG or earlier) often have a high zinc content, and zinc is an unbelievably good carbon promoter. Just 6 parts per million in diesel fuel can quickly lead to coked up fuel injectors!"

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#4536062 - 10/07/17 09:38 AM Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain]
Kestas Offline



Registered: 06/04/02
Posts: 12330
Loc: The Motor City
What does zinc in oil have to do with zinc in fuel?

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#4536067 - 10/07/17 09:44 AM Re: Is Zinc a "carbon promoter"? [Re: Kestas]
andyd Offline


Registered: 09/25/04
Posts: 7147
Loc: Marshfield , MA
Originally Posted By: Kestas
What does zinc in oil have to do with zinc in fuel?
coked rings? Just a wild guess.
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4536074 - 10/07/17 09:50 AM Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain]
Eddie Offline


Registered: 12/07/03
Posts: 9566
Loc: Florida, Cape Coral
Do we have a link to an article that has some data? Might be interesting. Ed
_________________________
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#4536092 - 10/07/17 10:11 AM Re: Is Zinc a "carbon promoter"? [Re: Eddie]
uart Offline


Registered: 06/09/10
Posts: 739
Loc: Australia
Originally Posted By: Eddie
Do we have a link to an article that has some data? Might be interesting. Ed

Good question. The only reference that I can find to the OPs quote is a guy called George saying it in a Norton motorcycle forum.

http://www.nortonownersclub.org/noc-chat/general/389181786


Edited by uart (10/07/17 10:11 AM)

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#4536106 - 10/07/17 10:45 AM Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain]
SonofJoe Offline


Registered: 07/23/16
Posts: 1052
Loc: Europe
I've never heard of ZDDP being a carbon promoter. I wonder if this is a case of 'guilt by association'?

If your engine's consuming oil (down the valve guides say) then it will deffo be a major contributor to piston deposits. If you analysed said deposits, you would definitely find Zinc there (as well as Phosphorus). If you were running very old spec oils, then you might find a lot more Zinc than say Calcium or Magnesium (from the Detergent). Also if we're talking old oils (all Group I, bugger all by way of additive) then the oil won't need much 'promoting' to turn to oxidised junk.

The link was for old Norton bikes (the ultimate in automotive hi-tech in 1961!) so all of the above seems plausible to me.

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#4536140 - 10/07/17 11:26 AM Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain]
CT8 Offline


Registered: 10/09/14
Posts: 10967
Loc: Idaho
Everything that probably doesn't combust thoroughly leaves carbon deposits cause most everything is carbon based . Chem 101

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#4536282 - 10/07/17 03:19 PM Re: Is Zinc a "carbon promoter"? [Re: SonofJoe]
CT8 Offline


Registered: 10/09/14
Posts: 10967
Loc: Idaho
Originally Posted By: SonofJoe
I've never heard of ZDDP being a carbon promoter. I wonder if this is a case of 'guilt by association'?

If your engine's consuming oil (down the valve guides say) then it will deffo be a major contributor to piston deposits. If you analysed said deposits, you would definitely find Zinc there (as well as Phosphorus). If you were running very old spec oils, then you might find a lot more Zinc than say Calcium or Magnesium (from the Detergent). Also if we're talking old oils (all Group I, bugger all by way of additive) then the oil won't need much 'promoting' to turn to oxidised junk.

The link was for old Norton bikes (the ultimate in automotive hi-tech in 1961!) so all of the above seems plausible to me.
If we are going back that far how about the leaded gas.
_________________________
"Don't let your preconceived notions get in the way of facts."
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