Any idea what system Ford uses in their 4L 6cly ? > >James, >Many different system from truly variable lift, duration and open & close >settings to VTEC (H*nda) which is just like having two camshafts with two >different profiles - one for low rpm and the other for high rpm so as you >can see I don't consider this system as truly variable - it works well >though as H*nda VTEC engines produce amongst the higher HP per litre in >road >production NA engines. The ECU turns on oil pressure supply on at 4000 rpm >to lock a pin in the secondary followers which starts up a second set of >valves. The VTEC engine is a 4 valve but only uses two valves up to ~4000 >rpm and then the other two get locked in. > >Plenty of reading on Google.com if you're interested: this one's not bad >http://www.canadiandriver.com/articles/jk/at_010529.htm > > >regards >Terry >
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