HTHS and ZDDP?

[illyas]

Im getting confuse by HTHS and ZDDP..
Since motorcycle require more ZDDP than normal automotive to protect the engine, so how about HTHS?
I read some topic from this forum, somebody are telling if the oil less than HTHS 4.0, it will not enter his sump. So what is this means? Obviously HTHS 4.0 is better than HTHS 2.6, but do this HTHS have any relation with the ZDDP?
Or, higher HTHS is better than just having high amount of ZDDP?

here is the example:
Mineral Oil SAE 15w40
Viscosity, ASTM D 445
cSt @ 40ºC 109
cSt @ 100ºC 14.5
Viscosity Index, ASTM D 2270 136
Sulfated Ash, wt%, ASTM D 874 1.0
HTHS Viscosity, mPa•s @ 150ºC, ASTM D4683 4.0
Pour Point, ºC, ASTM D 97 -39
Flash Point, ºC, ASTM D 92 236
Density @ 15 ºC, kg/l, ASTM D4052 0.88

in this typical properties, it didn't show how much ZDDP. So, is it safe?

another example:
Semi-Synthetic Oil SAE 10W-40
Viscosity, ASTM D 445
cSt @ 40º C 95.8
cSt @ 100º C 14.5
Sulfated Ash, wt%, ASTM D 874 1.0
Phosphorous 0.14
Flash Point, ºC, ASTM D 92 231
Density @15º C kg/l, ASTM D 4052 0.87
Pour Point, ºC, ASTM D 97 -30

this show up the amount of ZDDP, but didn't show up the HTHS.

What do you guys think? actually this two example are taking from same company but different product, wonder why they didnt put the complete technical data sheet there...

So, are HTHS higher is better? Or having ZDDP is better to our bike engine?

 

[MolaKule]

ZDDP and HTHS are totally unrelated.

HTHS is concerned with the oil's rheology at high temperatures (http://en.wikipedia.org/wiki/Rheology), whereas ZDDP at about 0.12% to 0.15% is thought to be about right for highly loaded cams.

 

[wileyE]

Hths pretty much follows viscosity. Believe the jaso lower limit is around 3 for bike oils. Many 30w and all 40 and 50's would easily be above the jaso limit.

I think any off the shelf formulated oil is going to have plenty of zinc for most bikes, H-D might be an exception. Most bikes have very small light valves controlled by light springs so cam galling isn't really an issue. Cam failures are usually caused an oil, supply problem.

 

[illyas]

I see.. thanks for that information.
Just curious about the Pennzoil GT Performance (SM/ SAE 15w50), my friend was telling me this is made for high revv automotive (HTHS about 4.6 if i remember correctly what he said) should be able to use in Motorcycle, and he is using it now. i wonder would that be any harm/ effect to his bike?
now i understand HTHS and ZDDP totally unrelated...