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General Category >> Rubber Side Down! >> ZDDP....why we need it.
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Message started by Dave on 10/14/15 at 04:02:56

Title: ZDDP....why we need it.
Post by Dave on 10/14/15 at 04:02:56
I was cruising around looking to see if I could find the ZDDP level in the Suzuki branded oil, and I found this good explanation of what ZDDP is and what it does.  It is absolutely necessary that you use an oil with a high (1,200 - 1,400 ppm) level of ZDDP if you want your cam and rockers to survive.

ZDDP is a single polar molecule that is attracted to Iron based metals. The one polar end tends to “Stand” the molecule up on the metal surface that it is bonded to by heat and friction. This forms a sacrificial layer to protect the base metal of the cam and tappet from contacting each other. Only at very high pressures on a flat tappet cam is this necessary because the oil is squeezed/wiped from the surface. This high pressure is also present on the gudgeon pin (wrist pin) in diesel engines, therefore the need for ZDDP in diesel engines.
Second part of the equation is Molybdenum disulfide (Moly). The moly bonds to the zinc adding an additional, very slippery, sacrificial layer to the metal. I found out that too much of the moly will create problems; lack of this material reduces the effectiveness of the ZDDP. The percentage, by weight is from .01 to .02%, not much, but necessary.

Title: Re: ZDDP....why we need it.
Post by DesertRat on 10/14/15 at 04:45:55
for the GEEK minded, here's the chemistry stuff:

https://en.wikipedia.org/wiki/Zinc_dithiophosphate

Title: Re: ZDDP....why we need it.
Post by LANCER on 10/14/15 at 08:15:32

5B606D7A6B677C7A6169647B080 wrote:
I was cruising around looking to see if I could find the ZDDP level in the Suzuki branded oil, and I found this good explanation of what ZDDP is and what it does.  It is absolutely necessary that you use an oil with a high (1,200 - 1,400 ppm) level of ZDDP if you want your cam and rockers to survive.

ZDDP is a single polar molecule that is attracted to Iron based metals. The one polar end tends to “Stand” the molecule up on the metal surface that it is bonded to by heat and friction. This forms a sacrificial layer to protect the base metal of the cam and tappet from contacting each other. Only at very high pressures on a flat tappet cam is this necessary because the oil is squeezed/wiped from the surface. This high pressure is also present on the gudgeon pin (wrist pin) in diesel engines, therefore the need for ZDDP in diesel engines.
Second part of the equation is Molybdenum disulfide (Moly). The moly bonds to the zinc adding an additional, very slippery, sacrificial layer to the metal. I found out that too much of the moly will create problems; lack of this material reduces the effectiveness of the ZDDP. The percentage, by weight is from .01 to .02%, not much, but necessary.


Thanks

Title: Re: ZDDP....why we need it.
Post by Kris01 on 10/14/15 at 20:33:24
I've been recommending this stuff for a while. You can get away with using Rotella "straight up" with no added ZDDP, but I like to blend it with a little more.

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