royal purple for flat tappet cams?
Posted March 22, 2011 at 09:02 am
Posted March 24, 2011 at 04:15 am
Racing oils arent the greatest in streetcars since they dont have
sufficent amounts of additives for soot and sludge control, they also have low TBN numbers
meaning that they cant control acidbuildup inside the engine. They do work good in an race engine that gets frequent teardowns and oilchanges.
To get good tappet protection use an oil with an API index not exiding SM.
Now while royal purple are indeed a good oil that should fullfill your needs i still wouldnt use it.(= price!)
I would use a HDEO instead (big rig "diesel" oil), meeting API CI...CI++ these are cheap and sturdy oils
that meets higher standards than their gas counterparts.(look for rotella, delo, delvac, john deere etc). The HeavyDutyEngineOil (=HDEO)specs
are so stringent that these oils will meet almost any demand an ordinary engine can throw at em. (they are quite popular as motorcykle oil, almost
always used in marine engines also)
Their main disadvantage is availiabilty in lower visc grades, you basically can get a xW-40 but for an summer driven v8
thats no problem. Another disadvantage is package- i always ends up with a 25 liter can but to me thats not a problem.( i use atleast 3 of em a year anyway)
I use these oil in everything except twostrokes....
The only other motoroils i consider are made by Redline, i usually dopes my oil with 5-10% redline to get the natural cleaning and seal sweel properties
of their esterbased oil. This is something you can do instead of getting expensive snake oil and it will gently clean things inside while still being
a really good oil, just make sure you get an oil that is for the proper usage ( motoroil-RL motoroil; ATF+4-RL C+ etc)
Edited by AC TC, March 24, 2011 at 04:51 am.
Posted March 26, 2011 at 08:51 pm
Posted March 28, 2011 at 03:28 am
There isnt much zinc in any more and the quality of the rest is barely snake oil.
The HDEO´s has all the antiwear you need from scratch.
Posted March 28, 2011 at 05:29 pm
Posted March 31, 2011 at 08:56 am
Not a race engine, just high performance street.
Posted April 1, 2011 at 03:32 am
But its not a race engine and its street driven- id use any HDEO in xW-40 flavour and no snake oil.
Side note: Dont get overly worried about zddp/ zinc since there are other additives that have it´s function.
But avoid the newest SL,SM oils since they do have lower contants of these additives and thats for resons like,
emissions and the fact that newer engines doesent need em as much. (read lower tappet loads, roller cams)