I was watching an old Mobil 1 commercial and it gave the impression that regular (dino) oil leaves a baked-on film on the cylinder walls.....is this true? So in a sense synthetic would be like using cooking oil in a pan?
Synthetic Oil Question
- Thread starter roadman1977
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I have never seen a baked on film on a cylinder wall.
I have torn many engines apart.
I have torn many engines apart.
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I don't think that commercial is implying the cylinder walls, rather the piston rings and the sides of the pistons.
There is a pic of the pistons from a 302 out of a '94 Cobra that somebody put up recently that will show you what that looks like.
There is a pic of the pistons from a 302 out of a '94 Cobra that somebody put up recently that will show you what that looks like.
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Originally Posted By: roadman1977
I was watching an old Mobil 1 commercial and it gave the impression that regular (dino) oil leaves a baked-on film on the cylinder walls.....is this true? So in a sense synthetic would be like using cooking oil in a pan?
I'm surprised that you are falling for those commercials...
Q.
I was watching an old Mobil 1 commercial and it gave the impression that regular (dino) oil leaves a baked-on film on the cylinder walls.....is this true? So in a sense synthetic would be like using cooking oil in a pan?
I'm surprised that you are falling for those commercials...
Q.
Wow, nice and clean. Are you at liberty to divulge what the Group II was? Nice pictures.
Quote:
There is a pic of the pistons from a 302 out of a '94 Cobra that somebody put up recently that will show you what that looks like.
And he is selling Syn oil.
No body knows the whole story with that thread.
There is a pic of the pistons from a 302 out of a '94 Cobra that somebody put up recently that will show you what that looks like.
And he is selling Syn oil.
No body knows the whole story with that thread.
The worst area's are usualy the head,pan and lower end for sludge. FOr carbon deposits it is the sides of the pistons. For varnish the whole engine is equal oppertunity. I have never seen a cylinder wall with anything other then high speed glazeing and varnish oh and lets not forget about the size of the ridge at the top!
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Originally Posted By: Bill in Utah
Quote:
There is a pic of the pistons from a 302 out of a '94 Cobra that somebody put up recently that will show you what that looks like.
And he is selling Syn oil.
No body knows the whole story with that thread.
Yes, that thread is a bit of a mystery, I agree.
I also feel that today's conventional oils are FAR better than the conventional oils of the past.
Quote:
There is a pic of the pistons from a 302 out of a '94 Cobra that somebody put up recently that will show you what that looks like.
And he is selling Syn oil.
No body knows the whole story with that thread.
Yes, that thread is a bit of a mystery, I agree.
I also feel that today's conventional oils are FAR better than the conventional oils of the past.
Originally Posted By: Bill in Utah
And he is selling Syn oil.
No body knows the whole story with that thread.
Why do you say that?
Looked like typical burned-on oil deposits that I have seen in the past in air-cooled engines, just worse - which maybe you'd expect out of a built engine without enough cooling oil flow to various hot spots.
As for this thread, I'd say cylinder bore would be about the last place for burned oil deposits to show up, as evidenced already.
And he is selling Syn oil.
No body knows the whole story with that thread.
Why do you say that?
Looked like typical burned-on oil deposits that I have seen in the past in air-cooled engines, just worse - which maybe you'd expect out of a built engine without enough cooling oil flow to various hot spots.
As for this thread, I'd say cylinder bore would be about the last place for burned oil deposits to show up, as evidenced already.
Originally Posted By: glennc
Originally Posted By: Bill in Utah
And he is selling Syn oil.
No body knows the whole story with that thread.
Why do you say that?
Looked like typical burned-on oil deposits that I have seen in the past in air-cooled engines, just worse - which maybe you'd expect out of a built engine without enough cooling oil flow to various hot spots.
As for this thread, I'd say cylinder bore would be about the last place for burned oil deposits to show up, as evidenced already.
Couple of things, firstly that particular thread was a water cooled engine in a Ford Cobra. Not an air cooled engine. Secondly, The question I believe Bill still has ( as I) is what power adder this gentleman was utilizing. Looked like significant cylinder pressure was causing blow by the rings. Question was asked of the OP if he used nitrous/Turbo/Blower and that question was never answered to the best of my knowledge. So it is difficult if not impossible to determine if those pictures reflected any type of oil related "failure" or related to improper engine/piston/ring design for the particular power adder of choice.
Originally Posted By: Bill in Utah
And he is selling Syn oil.
No body knows the whole story with that thread.
Why do you say that?
Looked like typical burned-on oil deposits that I have seen in the past in air-cooled engines, just worse - which maybe you'd expect out of a built engine without enough cooling oil flow to various hot spots.
As for this thread, I'd say cylinder bore would be about the last place for burned oil deposits to show up, as evidenced already.
Couple of things, firstly that particular thread was a water cooled engine in a Ford Cobra. Not an air cooled engine. Secondly, The question I believe Bill still has ( as I) is what power adder this gentleman was utilizing. Looked like significant cylinder pressure was causing blow by the rings. Question was asked of the OP if he used nitrous/Turbo/Blower and that question was never answered to the best of my knowledge. So it is difficult if not impossible to determine if those pictures reflected any type of oil related "failure" or related to improper engine/piston/ring design for the particular power adder of choice.
You can tell that block was cleaned up prior to the pic..
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Originally Posted By: GrampsintheSand
Originally Posted By: glennc
Originally Posted By: Bill in Utah
And he is selling Syn oil.
No body knows the whole story with that thread.
Why do you say that?
Looked like typical burned-on oil deposits that I have seen in the past in air-cooled engines, just worse - which maybe you'd expect out of a built engine without enough cooling oil flow to various hot spots.
As for this thread, I'd say cylinder bore would be about the last place for burned oil deposits to show up, as evidenced already.
Couple of things, firstly that particular thread was a water cooled engine in a Ford Cobra. Not an air cooled engine. Secondly, The question I believe Bill still has ( as I) is what power adder this gentleman was utilizing. Looked like significant cylinder pressure was causing blow by the rings. Question was asked of the OP if he used nitrous/Turbo/Blower and that question was never answered to the best of my knowledge. So it is difficult if not impossible to determine if those pictures reflected any type of oil related "failure" or related to improper engine/piston/ring design for the particular power adder of choice.
As I stated in that thread, the parts from that engine looked to be stock. Remember, there is NOTHING special about the "Cobra" engine other than the heads and intake. The camshaft is the same as that out of the T-bird if I remember correctly (milder than the HO cam). It's a hypereutectic pistoned 302 with moly rings; the same shortblock as the HO engine. Same rods and crank as any other 302.
It's definitely not a "built" engine from what I can tell. And yes, I think there was likely a power-adder used for at least some of that engine's life, though it could just be neglect of the PCV system. These engines have a screen below the PCV valve that will plug up and cause excessive crankcase pressure which leads to ring-seal issues.
Originally Posted By: glennc
Originally Posted By: Bill in Utah
And he is selling Syn oil.
No body knows the whole story with that thread.
Why do you say that?
Looked like typical burned-on oil deposits that I have seen in the past in air-cooled engines, just worse - which maybe you'd expect out of a built engine without enough cooling oil flow to various hot spots.
As for this thread, I'd say cylinder bore would be about the last place for burned oil deposits to show up, as evidenced already.
Couple of things, firstly that particular thread was a water cooled engine in a Ford Cobra. Not an air cooled engine. Secondly, The question I believe Bill still has ( as I) is what power adder this gentleman was utilizing. Looked like significant cylinder pressure was causing blow by the rings. Question was asked of the OP if he used nitrous/Turbo/Blower and that question was never answered to the best of my knowledge. So it is difficult if not impossible to determine if those pictures reflected any type of oil related "failure" or related to improper engine/piston/ring design for the particular power adder of choice.
As I stated in that thread, the parts from that engine looked to be stock. Remember, there is NOTHING special about the "Cobra" engine other than the heads and intake. The camshaft is the same as that out of the T-bird if I remember correctly (milder than the HO cam). It's a hypereutectic pistoned 302 with moly rings; the same shortblock as the HO engine. Same rods and crank as any other 302.
It's definitely not a "built" engine from what I can tell. And yes, I think there was likely a power-adder used for at least some of that engine's life, though it could just be neglect of the PCV system. These engines have a screen below the PCV valve that will plug up and cause excessive crankcase pressure which leads to ring-seal issues.
Yes I agree the engine coming from the factory is as you describe. Tuned a tad differently though. But I suspect some power adder contributed to the results in the pics the OP posted. If this is the case, then I doubt one could blame oil as the sole culprit. Do you agree?
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Originally Posted By: GrampsintheSand
Yes I agree the engine coming from the factory is as you describe. Tuned a tad differently though. But I suspect some power adder contributed to the results in the pics the OP posted. If this is the case, then I doubt one could blame oil as the sole culprit. Do you agree?
Some power adder and perhaps (most likely) lots of abuse. No, the oil cannot be blamed as the sole culprit. Mustangs (as I stated in the other thread) are cars that see a LOT of abuse because of demographic they seem to target.
The Cobra ECM tune is actually milder (timing tables) than the HO tune. But the ECM is setup for 24lb injectors, which is why the Cobra ECM and MAF swap is often regarded as a great, cheap, way to update to 24lb/hr injectors.
The most aggressive factory tunes are the SD tunes if I remember correctly. 87 and 88. 89 (first year of mass air in everywhere but California, which saw it in '88) was slightly milder and the switch to mass air was for emissions reasons. Of the MAF ECM's, 89-93 are all basically identical, the automatic ECM having a slightly "better" timing curve than the stick ECM's. The A9L is the most well-known ECM of this time-frame. The 93 Cobra ECM is the "simple swap" for 24lb/injectors in these cars. 94 and 95 (the start of the SN95 cars) had a [censored] tune. Their ECM's were also different (transmission control for example) than the previous EEC-IV ECM's and many people despise them.
Other than the injector size difference and perhaps some mild changes in the timing tables, there are no real significant differences between the 93 Cobra ECM and the 93 HO ECM, and the 94/95 Cobra ECM and the 94/95 HO ECM.
Yes I agree the engine coming from the factory is as you describe. Tuned a tad differently though. But I suspect some power adder contributed to the results in the pics the OP posted. If this is the case, then I doubt one could blame oil as the sole culprit. Do you agree?
Some power adder and perhaps (most likely) lots of abuse. No, the oil cannot be blamed as the sole culprit. Mustangs (as I stated in the other thread) are cars that see a LOT of abuse because of demographic they seem to target.
The Cobra ECM tune is actually milder (timing tables) than the HO tune. But the ECM is setup for 24lb injectors, which is why the Cobra ECM and MAF swap is often regarded as a great, cheap, way to update to 24lb/hr injectors.
The most aggressive factory tunes are the SD tunes if I remember correctly. 87 and 88. 89 (first year of mass air in everywhere but California, which saw it in '88) was slightly milder and the switch to mass air was for emissions reasons. Of the MAF ECM's, 89-93 are all basically identical, the automatic ECM having a slightly "better" timing curve than the stick ECM's. The A9L is the most well-known ECM of this time-frame. The 93 Cobra ECM is the "simple swap" for 24lb/injectors in these cars. 94 and 95 (the start of the SN95 cars) had a [censored] tune. Their ECM's were also different (transmission control for example) than the previous EEC-IV ECM's and many people despise them.
Other than the injector size difference and perhaps some mild changes in the timing tables, there are no real significant differences between the 93 Cobra ECM and the 93 HO ECM, and the 94/95 Cobra ECM and the 94/95 HO ECM.
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