If you think it is safe to redline as soon as you see 3 bars on the dash, think again
09-28-2001, 07:25 AM
#21
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I think a lot of the reason they don't recommend synth for the rotaries is that the oil is actually injected into the rotary engine in order to lube the apex seals. As someone mentioned on this thread, synth doesn't burn off as easily and might lead to a buildup of oil in the rotary engine.
Comparing rotaries to piston engines is really an apples and oranges deal.
Also, I should note that while I am questioning whether it's really necessary to wait the extra few minutes after getting three bars, as a rule - I do always wait a few minutes after the coolant gets up to temp before running the car hard... I'm simply questioning it because it's brought about a great discussion and because I really do have my doubts that it's completely necessary. But as there is definitely doubt on the matter, I would advise everyone to be safe and wait for the oil to heat up before running the car hard.
Comparing rotaries to piston engines is really an apples and oranges deal.
Also, I should note that while I am questioning whether it's really necessary to wait the extra few minutes after getting three bars, as a rule - I do always wait a few minutes after the coolant gets up to temp before running the car hard... I'm simply questioning it because it's brought about a great discussion and because I really do have my doubts that it's completely necessary. But as there is definitely doubt on the matter, I would advise everyone to be safe and wait for the oil to heat up before running the car hard.
09-28-2001, 07:33 AM
#22
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UL -- Can't wait to see what happens. I'm wondering about an unanticipated factor of some kind.
Luis -- We're arguing about subtleties and vagaries. No one's disagreeing that the engine needs to be warm before thrashing.
Luis -- We're arguing about subtleties and vagaries. No one's disagreeing that the engine needs to be warm before thrashing.
09-28-2001, 10:59 AM
#23
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Rev, while rotaries are very different, the combustion dynamics really aren't. The fact that they have problems burning synth which results in mileage and hp problems points to a _potential_ issue with an engine like the F20C that uses a fair bit of oil. Conversely, older air/oil cooled 911s used plenty of oil and were filled with Mobil1 from the factory. Hence the need for more investigation.
On the topic of oil "making" power, it can free up a substantial amount. I participated in a dyno test for some Redline products. They were given to us blindly and asked to have them tested. We went from regular dino oil to the same weight synthetic from Redline. Oil and water temps were monitored to make sure that the test conditions were consistent. The Redline oil showed a nearly constant 1.5-2% power gain on a chassis dynamometer and the results were repeatable. Not a lot of power freed up, but considering how much some people pay for zero power gains... :-)
UL
On the topic of oil "making" power, it can free up a substantial amount. I participated in a dyno test for some Redline products. They were given to us blindly and asked to have them tested. We went from regular dino oil to the same weight synthetic from Redline. Oil and water temps were monitored to make sure that the test conditions were consistent. The Redline oil showed a nearly constant 1.5-2% power gain on a chassis dynamometer and the results were repeatable. Not a lot of power freed up, but considering how much some people pay for zero power gains... :-)
UL
09-28-2001, 12:40 PM
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Originally posted by StrangeDaze
It would be interesting to get some more impressions from users of Mobil 1, particularly divided along the lines of people whose engine is using a lot of oil compared to those whose engine is using very little to no oil between changes.
It would be interesting to get some more impressions from users of Mobil 1, particularly divided along the lines of people whose engine is using a lot of oil compared to those whose engine is using very little to no oil between changes.
UL's hypotheses of shear strength corellating with oil burning, gas mileage, and power makes sense, especially with an engine not quite broken in and with rings that still need more seating.
Certainly some have indicated distinct impression of vtec kick being less with synthetic, though I have in the past attributed this to less power subvtec with nonsynthetic oil, but I am beginning to rethink this.
09-28-2001, 03:26 PM
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If we ever sort this out it will be facinating because it doesn't make any sense. Think of synthetic as genetically reengineered dino. It's not that different; a "gene splice" here or there...
Of the many questions that come to mind here's one: What could shear strength possibly have to do with flammability?
Of the many questions that come to mind here's one: What could shear strength possibly have to do with flammability?
09-28-2001, 04:28 PM
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Originally posted by marcucci
OK, Luis, if this is the case, can you relate this phenomenon to oil pressure? If the oil requires 6 times much more pressure, how come most vehicles, before even being "warm," have normal pressure readings at colder temps?
OK, Luis, if this is the case, can you relate this phenomenon to oil pressure? If the oil requires 6 times much more pressure, how come most vehicles, before even being "warm," have normal pressure readings at colder temps?
What am I missing?
Originally posted by marcucci
You never did answer, what's the lowest discernable deflection on your gauge?
You never did answer, what's the lowest discernable deflection on your gauge?
