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
_______________________________________________
Land-speed@autox.team.net
Archive: http://www.team.net/archive
|