Originally Posted By: 555
There is some sort of extra valve to "tumble" the mixture on cold starts. This is what causes the racket on startup. Also this engine is not direct injected, which would make extra noise alla da time! Have 10k on my XV with CVT and the mileage and performance improve significantly with miles. Nicest part of top, inverted oil filter is that you could change the filter more often and not replace the oil. I'm not advocating longer time in the crankcase for the oil, just that if you put in a decent 100% synthetic then why not change the filter in the middle of it's life?
Mazda plays with the valve timing during cold start. It sounds funny for a minute or so until it gets "warmed up".
But my Focus is port injected and there is no variable valve timing.
There is some sort of extra valve to "tumble" the mixture on cold starts. This is what causes the racket on startup. Also this engine is not direct injected, which would make extra noise alla da time! Have 10k on my XV with CVT and the mileage and performance improve significantly with miles. Nicest part of top, inverted oil filter is that you could change the filter more often and not replace the oil. I'm not advocating longer time in the crankcase for the oil, just that if you put in a decent 100% synthetic then why not change the filter in the middle of it's life?
Mazda plays with the valve timing during cold start. It sounds funny for a minute or so until it gets "warmed up".
But my Focus is port injected and there is no variable valve timing.