Joe Gibbs Wear Test
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That's interesting.
However, I do wonder what an approved cam lobe wear test would demonstrate?
For example, Sequence IVA (ASTM D 6891)
However, I do wonder what an approved cam lobe wear test would demonstrate?
For example, Sequence IVA (ASTM D 6891)
$18.95 a qt. it better be magic.
Originally Posted By: willix
$18.95 a qt. it better be magic.
[sarcasm]It creates miniature black holes that suck all bad things out of your engine, but the life blood: Clean oil.
[/sarcasmoff]
$18.95 a qt. it better be magic.
[sarcasm]It creates miniature black holes that suck all bad things out of your engine, but the life blood: Clean oil.
[/sarcasmoff]
Hi.
I don't think it's correct for them to make a claim of offering virtually no wear on DLC coated lifters, due to the use of their oil.
DLC is much harder than steel or aluminum. Camshafts will inevitable be softer than DLC. Remember, DLC is diamond-like carbon. It is amorphous in structure. Using any oil, you would not see wear on DLC. Period. No ifs ands or butts. Unless the cam lobes were made out of something harder than DLC, I would like to see it.
Even with ferritic treatments such as nitrocarburization, I will still be hard pressed to believe that it would be harder than DLC to cause wear. Or at least noticeable wear that has an adverse effect on engine performance.
I don't think it's correct for them to make a claim of offering virtually no wear on DLC coated lifters, due to the use of their oil.
DLC is much harder than steel or aluminum. Camshafts will inevitable be softer than DLC. Remember, DLC is diamond-like carbon. It is amorphous in structure. Using any oil, you would not see wear on DLC. Period. No ifs ands or butts. Unless the cam lobes were made out of something harder than DLC, I would like to see it.
Even with ferritic treatments such as nitrocarburization, I will still be hard pressed to believe that it would be harder than DLC to cause wear. Or at least noticeable wear that has an adverse effect on engine performance.
That's the trick. NOTICEABLE wear or wear that has any meaningful effect.
Hey, when it's your own oil and commercial I bet it's hard to get a bad result!
Hey, when it's your own oil and commercial I bet it's hard to get a bad result!
Originally Posted By: SteveSRT8
That's the trick. NOTICEABLE wear or wear that has any meaningful effect.
Hey, when it's your own oil and commercial I bet it's hard to get a bad result!
So true!!!! LOL Or run a test until you get the results you're looking for. Buy a lab and pay for the results you're looking for LOL.
That's the trick. NOTICEABLE wear or wear that has any meaningful effect.
Hey, when it's your own oil and commercial I bet it's hard to get a bad result!
So true!!!! LOL Or run a test until you get the results you're looking for. Buy a lab and pay for the results you're looking for LOL.
Originally Posted By: dtt004
Hi.
I don't think it's correct for them to make a claim of offering virtually no wear on DLC coated lifters, due to the use of their oil.
DLC is much harder than steel or aluminum. Camshafts will inevitable be softer than DLC. Remember, DLC is diamond-like carbon. It is amorphous in structure. Using any oil, you would not see wear on DLC. Period. No ifs ands or butts. Unless the cam lobes were made out of something harder than DLC, I would like to see it.
Even with ferritic treatments such as nitrocarburization, I will still be hard pressed to believe that it would be harder than DLC to cause wear. Or at least noticeable wear that has an adverse effect on engine performance.
Yes. DLC has a Vickers Hardness number of ~2000. Carbonitrided steel runs about 850 VHN. But that is not to say that DLC will not wear.
In my job developing advanced valvetrain components, I have been working steadily with DLC coatings for the last 5 years. We have had a lot of success running it with 5w20 SM-spec oils in a sliding wear environment, BUT ONLY if the substrate is hard and smooth. What I see wrong in the pictures on Joe Gibbs website is that the lifter faces were not polished.
But since they were doing a direct comparison test between a high-zddp oil and an SN oil on lifters of equivalent roughness, I think it does show less tendency to wear with more zddp in the oil.
Hi.
I don't think it's correct for them to make a claim of offering virtually no wear on DLC coated lifters, due to the use of their oil.
DLC is much harder than steel or aluminum. Camshafts will inevitable be softer than DLC. Remember, DLC is diamond-like carbon. It is amorphous in structure. Using any oil, you would not see wear on DLC. Period. No ifs ands or butts. Unless the cam lobes were made out of something harder than DLC, I would like to see it.
Even with ferritic treatments such as nitrocarburization, I will still be hard pressed to believe that it would be harder than DLC to cause wear. Or at least noticeable wear that has an adverse effect on engine performance.
Yes. DLC has a Vickers Hardness number of ~2000. Carbonitrided steel runs about 850 VHN. But that is not to say that DLC will not wear.
In my job developing advanced valvetrain components, I have been working steadily with DLC coatings for the last 5 years. We have had a lot of success running it with 5w20 SM-spec oils in a sliding wear environment, BUT ONLY if the substrate is hard and smooth. What I see wrong in the pictures on Joe Gibbs website is that the lifter faces were not polished.
But since they were doing a direct comparison test between a high-zddp oil and an SN oil on lifters of equivalent roughness, I think it does show less tendency to wear with more zddp in the oil.
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Anybody else notice the massive difference in fuel dilution (like DOUBLE) which would of course allow for more wear?
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