[Land-speed] Oil and Filters...more questions..

[Bryan Savage]

As I understand it Mayf, NASCAR teams use 0W-30 for qualifying and 0W-50 
for the race. I suggest you select 0W-50 for your motor. The M-1 racing 
oils have high levels of DPPZ which helps cams and valves.
Bryan

On 7/30/2013 7:47 AM, Larry Mayfield wrote:
> Thanks to everyone, I am a lot more informed on oil and filters. The 
> plurality of recommendations for oil was Mobile 1.  Ok, works for me. 
> However, within the Mobil 1 oil line up spectrum, there are quite a 
> number of oils in many different weights. The oil needs to be able to 
> do its job under a lot of stress: acceleration of teh car and pushing 
> the air up a steeper and steeper aero hill.  It needs to be able to 
> carry the heat away from the internal rotating and sliding parts.  I 
> was once told by a local Las Vegas NASCAR motor builder that the pump 
> needed should be  a high volume pump, not a high pressure one, so that 
> lots of oil could be pushed through the bearing clearances. It made 
> sense to me.  However, the replies I got had oil recommendations from 
> a light weight multi grade oil to heavy single ot at least a very low 
> multi with hight viscosity upper grade: Such as 0W 30 to 0W 50 
> weights.  Ok, those are available and some of them are down right 
> expensive.  I am still lacing some information, lol.
>
> My motor specs are basically OEM: stock rod and journal bearing 
> clearances, rod to rod clearances are OEM, etc. Valves use bronze 
> guides, etc. I have a high volume pump. But, I am missing the logic 
> and engineering behind the recommendations for the oil grades (hey, 
> what can I say, I am an old engineer). Experience plays a large part 
> or the recommendations, I know.   Do the Sprint Cup cars use 0w 50 
> weight oil?  Or do they use lower viscosity multi grade like 0W 30 or 
> even 0W 20?  Either way, why?  Same for light airplane motors; Those 
> puppies are at work the whole time they are in the air. What oils do 
> they use and why?    These are the kinds of things I would like to 
> know regards oils..
>
> For the filters, Mobil 1, Pure one and WIX were recommended. I cut a 
> WIX apart and it appeared to be well made and had specs that said it 
> could remove particle sizes down to approximately (I think I remember) 
> 25 microns.  To refresh, a micron is one millionth of a meter.  There 
> are 25400 microns per inch or one micron is 0.00003934 inches.  So a 
> filter than CAN remove (doesn't say will!) remove a 25 micron particle 
> size or so means that it might let one through that is just under 
> 0.001 inches.  Seems to me that that is pretty large given some of the 
> rotating clearances.  A lot of the filters said 60 microns!  Now, I am 
> guessing that there is a balance between the flow capability and 
> particle size so the sizes are compromises. Seems to me that if the 
> motor is contributing bits and pieces of that size, that it is or may 
> be not long for the world.  I like the idea of using a screen with a 
> small mesh before great filter and that between the two it would 
> remove most junk.  But is that over kill? The screen can tell me what 
> or if things are starting to come apart.
>
> Right now, I am leaning towards Mobil 1, 5W 30 Truck & SUV full 
> synthetic oil used with a good filter such and the Royal Purple, WIX 
> or Mobil 1 filters.  I know that yo all use as a group the full 
> spectrum of oil and filter products, so why do you use them? I like 
> technical responses rather than anecdotal ones however, experience and 
> the situation under which the experience was gained is important.
>
> Any more replies and responses here?  Maybe your comments and thoughts 
> will save some one's expensive motor...
>
> anyhoo, thanks for listening...
>
> still learning
>
> mayf