mtunreal

If a correct flushing proceedure has not been followed, the old oil would be still in priority contact with components. How come the introduction of a new oil would reduce the power significantly at VTEC change over? If the same weighting of oil is used that is defined by viscosity what could of changed?

sound_wave

I'm glad you did this exercise Ray. When I posted up the other day about the Petronas oil, I got what felt like a bit of a bashing, with people basically saying "it's cheap so it must be rubbish".

Just goes to show that all that glistens isn't always gold!!!

Si2k

Put some petrol in with your next oil change for a similar effect.

All I can think is that for some reason it's not hitting 55psi until 6600rpm rather than the 6200rpm VTEC point. Hence the delayed VTEC. Why it does this would need some more fundamental understanding.

I assume the VTEC filter is clean. What level were all the oils put to ? Max on stick? Oil filter changed at all ?

Si2k

It's odd that people are judging an oils performance purely on this test too.

Look at the specs to give an idea of performance for deposits, oil consumption, wear etc

mtunreal

I'm considering the properties of the oil opposed to the spec sheets

I get the feeling that the oil is placing resistance in the engine resulting in the dip. If the castrol oil does reduce the tct wear it must be depositing something or this layer must equally be a component of resistance. It would suggest that this increases the friction in the engine. Comparatively to resistance, it may just not be as lubricated. An oil offering an increasee resistance/friction would aid the tct movement, just like the sandblasting/porting method. A less resistive oil may expose the weakness in tct design, remembering stock oil was a different weighting.

BuggyofMildDiscomfort

This would seem most likely to me.

sound_wave

When you say look at the specs Si, what do you mean? Which spec on the labels would relate to what?

Si2k

And ironically, Higher oil flow would mean lower oil pressures.

Ultra_Nexus

Since the JDM version has no oil pressure sensor for the VTEC, I don't think this is the case. There is enough pressure easily, if there wasn't the big ends would be destroyed. The VTEC system is a simple switch - it's either on or off and it engages within a couple of revolutions. When the engine is doing 100 revolutions per second, this is pretty much instantaneous.

VTEC engages at 6200rpm, but this is affecting a 1500-2000rpm band! This has little to do with the middle lobe and is an ECU issue.

Something within Edge is causing the ignition timing to be wound back.

Si2k

Does this engine burn oil. As oil can affect knock especially when the engine is red hot on a dyno with inadequate cooling.

Although its not like the other oils are full of MMT