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What you "technically" have to run is not always what's best.
IF you don't know that then that's your problem not mine. I can only go by what I have been advised by many major engine companies, not what the EPA or sponsor ship has told the marketing department to print.
So there you have it. You made up an answer, and now you can't defend it with references.
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#1 I have spent 5 years speaking with engine builders from all over the world. From NASCAR - V8 SUPERCAR and SPEEDWAY.
That's considered "heresay" and thus is not valid evidence.
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#2 I have spoken extensive with the head tech guy's from all the major oil companies in Australia, not just one or one person.
So what? Unless we know the details of the questions asked and the replies in context, you can repeat this until you're blue in the face.
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#3 I have only ever made reference to 70-80's style V8 engines not EVERY engine, so I don't believe I have made a blanket recommendation like that without asking a few questions first.
The 'style' isn't the determining factor here. You can take a BBC, use modern materials, machined to tighter clearances/tolerances with much improved surface finishes, and add rollerized components throughout the valvetrain and other areas and the viscosity needs are changed significantly.
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#4 YOU said any engine that runs a 20w 50 is a POS and your thoughts that my comment relating to the oils used in the 70-80's. Well I was making a general comment about the high sales of 20w 50's in that era and how they were used more extensive. These engines that were new and using 20w 50s' had no problems.
As mention way earlier in this thread, that is such a general comment as to almost certainly be wrong in some situations. Anybody trying to run 20w50 in their street BBC during a Chicago winter in the 70's, didn't do it for long. And yes, if today you buy a brand new shiny street BBC and it's machined with the clearances/tolerances/surfaces of 70's rebuilt, it's a POS.
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#5 I have only shard what I have been told. I have been very detailed to make sure I was not professing to know or derogative towards any one persons thoughts. (unlike yourself)
I can see why some people here have not bothered to get in to deep discussions with you, as no matter what your right and unless it's there in direct day light printed in big bold letters in every hand book there's no way it could be right.
Sorry...but the problem I have is that people like you come around every so often and profess that they have it all figured out. In your case, you profess 'engine style' determines basestock/viscosity requirements. All my engineering, racing, and mechanic wretching education and experience tells me you're flat out wrong. There's many more variables to consider than just 'engine style'.
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If that's your view to engine oils then why come here asking questions and looking to learn. If every engine manual or broacher you read must be right or you don't want to see out side the square there's not much else for you here.
No. It's more like you need to take a reading comprehesion class. Let's take one of your links:
Use of Synthetic Oils
Crower does not recommend the use of synthetic motor oils in any racing applications, particularly hydraulic and flat tappet camshafts. The minimum gains in horsepower are offset by the excessive wear to cam and lifter surfaces. Crower recommends Kendall GT-1 (20W50) Petroleum based motor oil in all high performance applications. If your manual suggests running synthetic oil, then do so. We have found, however, that the benefits do not outweigh the costs.
Note, first it says "racing applications", Second it says "hydraulic and flat tappet camshafts". Third it say "If your manual suggests running synthetic oil, then do so"
So in summary, it says "don't use synthetics in a racing engine with flat tappets unless your builder tells you to, but we recommend Kendall GT-1 (20W50) Petroleum based motor oil". That's quite a bit different then saying all "V8 type engines should use 20w50 mineral for all applications".
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I don't want to start a war, but your POS comment does not sit right with me when your suggesting that major companies like Competition Cams are Wrong!
I didn't say they were always wrong. I'm saying that when YOU take things out of context, YOU'RE wrong.
