Hello ppl i love d serie, i dont wanna spend money in another series. i till see ppl saying that d15b is better than d16a9, what make it better?.

 

I'm not very familiar with the A9, but I'd put my money on it for all out performance. It's head design will probably out perform SOHC VTEC heads for several reasons. 1) DOHC heads generally flow better. 2) Non-VTEC heads out perform VTEC heads within their desired powerband, without giving up much below the powerband either from what I've seen.

Onthe street you may prefer SOHC VTEC though. It's mild lower rpm cam profile allows for a lower idle,morepower below 3k-4k rpm generally, and better gas milage. The D15B also has a shorter stroke, it should be mentioned, which does help it produce power at higher rpms than similar SOHC VTEC D16s. I wouldn't know how it compares to DOHC Non-VTEC in that regard though; the reasons above still may give it the edge.

Depends on what you need it for. The A9 will also cost a bit more to mod, as it's aftermarket isn't as developed, an extra camshaft/cam gearwill need to be purchased, and it's rod specs are a little bit different from SOHC D16s, so rod manufacturers may charge a bit more for them.

 

As he already said, the D15B will have more aftermarket support then the A9. and you can also probably find a complete D15B swap fairly cheep.

 

Yes, D15Bs are much easier to find in NorthAmerica.