Quote:
Originally Posted by bullettdsm
Actually, I'm not in the car at the dyno (Matt is), but if there were any radical changes in the oil pressure, Matt would have noticed and told me. Keep in mind that the mod restricts at the head and my pick up is down low. But I think I see where you are going with that; did the restriction/blockage generate more pressure for the pump to push elsewhere? Not that I noticed, though I wasn't watching for it.
Well, guys, you're gonna have to 'splain that one to me. This is a mechanical/hydraulic change to our 2.0 design. It has nothing to do with the combustion chamber or the intake/exhaust tract (the area's that boost generally affect). What is does do is alter the workings of the valve train (by limiting oil to the valve train). Don't think of the dyno chart as a whp measurement, think of it as an rpm meter. As the rpm's go above 6800ish, the valves no longer do their proper job because the oil restriction does not allow them to work properly. Whether you are making 100whp or 500whp the relationship will stay the same. Power level actually doesn't come into play.
MB
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That's why the mod has a greater effect at higher rpms on boosted applications though. At that point when the lifters don't do their job it's due to the speed of the engine and oil pressure. You can't do anything about speed but this changes the oil pressure part. True your engine and a boosted engine are moving at the same speed but a lifter that doesn't open a valve enough on a NA car will shortchange flow a lot less than a boosted engine flowin a lot more aire per second or millisecond. So the amont of time is the same that the valve does not open or close properly but the amount of air lost due to this isn't.