im trying to source an engine for my impreza sport rally car NA, i was going for the option of droping a 2.5 legacy engine in, as long as the legacy is of the same series then the engine will work with change of ecu,

but looking around for engines and theres quad cam version and twin cam?

any one know whats different in these and which is better? more bhp? stronger? and surely it cant have 4 cam shafts lol?

some one explain! please

 

one inlet, one exhaust cam on each side = quad cam

 

so which is better? and are they same engine?

 

Go for the Quad cam, the single cam per bank have cam fingers & don't like high rpm, Piper do a cam profile for the N/A quad cam engines for the road rally engines.

 

ive looked a little further into it, apparently the whole loom will need to be changed to run the quad cam? and the DOHC wil basicaly plug and play?

 

surely double overhead cam is the same as quad cam ?........2 cams per head

 

No, double overhead cam is 2 cams per engine, quad cam is 4 cams per engine.

 

why would they make two types of engines for the same year and model of car?