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Not too efficient. It's safe.
The pops and bangs map allows over-run fuelling, but only around 22:1afr, then retards the ignition between 12 and 16 degrees atdc.
Which inturn means that the mixture is still burning as it enters the exhaust stroke. Which then means those valve stems are being...
Belts give a warning in the form of a service interval.
BMW claim lifetime chain intervals. b****cks. I've yet to see one that hasn't stretched or worn it's tensioner away.
Chains are run on oil pressure tension, so when an engine is most likely to skip a few teeth, is upon sudden bursts of...
It's not actually the sleeve that's rattling either. I fitted one to a mates car on Sunday and we spent ages working it what the rattle is. Actually took the reverse sleeve off, and it still rattles. It's harmonics from the engine echoing up the tube IMO.