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Is Zinc a "carbon promoter"? #4536052
10/07/17 08:31 AM
10/07/17 08:31 AM
Joined: Apr 2017
Posts: 426
Mississippi
Speak2Mountain Offline OP
Speak2Mountain  Offline OP
Joined: Apr 2017
Posts: 426
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!"

Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain] #4536062
10/07/17 08:38 AM
10/07/17 08:38 AM
Joined: Jun 2002
Posts: 12,642
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,642
The Motor City
What does zinc in oil have to do with zinc in fuel?

Re: Is Zinc a "carbon promoter"? [Re: Kestas] #4536067
10/07/17 08:44 AM
10/07/17 08:44 AM
Joined: Sep 2004
Posts: 7,812
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,812
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
Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain] #4536074
10/07/17 08:50 AM
10/07/17 08:50 AM
Joined: Dec 2003
Posts: 9,922
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,922
Florida, Cape Coral
Do we have a link to an article that has some data? Might be interesting. Ed


CX5 Touring 2.5L :-)
Re: Is Zinc a "carbon promoter"? [Re: Eddie] #4536092
10/07/17 09:11 AM
10/07/17 09:11 AM
Joined: Jun 2010
Posts: 739
Australia
uart Offline
uart  Offline
Joined: Jun 2010
Posts: 739
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

Last edited by uart; 10/07/17 09:11 AM.
Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain] #4536106
10/07/17 09:45 AM
10/07/17 09:45 AM
Joined: Jul 2016
Posts: 1,224
Europe
SonofJoe Offline
SonofJoe  Offline
Joined: Jul 2016
Posts: 1,224
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.

Re: Is Zinc a "carbon promoter"? [Re: Speak2Mountain] #4536140
10/07/17 10:26 AM
10/07/17 10:26 AM
Joined: Oct 2014
Posts: 12,577
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,577
Idaho
Everything that probably doesn't combust thoroughly leaves carbon deposits cause most everything is carbon based . Chem 101

Re: Is Zinc a "carbon promoter"? [Re: SonofJoe] #4536282
10/07/17 02:19 PM
10/07/17 02:19 PM
Joined: Oct 2014
Posts: 12,577
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,577
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.


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