Originally Posted by M1CH43L
Originally Posted by DazC
There is no answer!!!
Build an engine to suit what you want it to do.
it all well and good saying that but i was asking for ur opinions coz u lot have probs done some thing like it before and u lot know more about zvh conversions than most web sites
Ok, there are so many different engine specs that deciding what engine to run will be very hard.
Generally unless the Zetec crank and rods are addressed, they won't like reving past 5k rpm where as the CVH will keep reving.
The Zetec head will flow more air than a CVH head but both will benefit from porting. A big valve ported CVH head has never been maxed out to my knowledge and then neither has the equivelent Zetec head.
ZVH is a pointless option IMO. They aren't a bad engine but why bother modifying the block to fit the head when you can just modify the manifolds to fit the head.
The Zetec based engines will be nicer to drive off boost and round town. The only other difference between the CVH and the Zetec engine is the CVH will keep pulling all the way to the red live where as the Zetec will slowly start to tail off, usually around the 5.5k rpm point. The Zetec will produce a big surge of torque which isn't helpfull for the gearbox or traction.
Cetrain things can be got round by different compression ratios, cams, valve ports and turbo sizes.