d15 bottem end VS d16 bottom end.....

turbo_teg

what makes a d15 a d15? is it a smaller piston bores? stroke? im asking because my buddy is offering me a free d15 and i want to use the bottom end to make my mini me. my plan was to get shot peened d16 rods w/ ARP bolts, and vittara pistons but will the d15 crank let me do this?

jhota

D15 has a shorter deck height (207 mm vs. 212 mm), stroke (84.5 mm vs. 90 mm) and connecting rod (134 mm vs. 137 mm) than the D16.

however, as far as i know, the D16 rods will work with a D15 block and crank using Vitara pistons. this is due to the Vitara's lower compression height and huge dish.

are you going turbo or N/A?

turbo_teg

turbo

jhota

so, you're going for a low compression build? or middle-of-the road, with less boost?

turbo_teg

im going for low compression but if that d15 has a wierd deck height im just gunna stick with the vittaras in my d16 block with the y8 head.

jhota

yeah, use the D16 block. you get some odd stuff mixing D15/D16 bottom end parts.

compression with the Vitaras and a Y8 head would be about golden in a D16... 8.6 or so.

turbo_teg

i hope so i was worried that the y8 head would bump it up too pretty much what it is now..... i guess ill just have to try it out and see.

dukevonDANK

I was looking into putting a y8 head on an a6 for my RT, but read cr is around 11:1....
am I high or does that look correct?

edit: nvm: 10.6:1

ludeman

dukevonDANK wrote:

I was looking into putting a y8 head on an a6 for my RT, but read cr is around 11:1....
am I high or does that look correct?

edit: nvm: 10.6:1

This is what I have, its a nice jump from stock a6 as long as you do a real vtec with ecu, not an RPM switch.
I bought mine with the RPM switch and my buddy loaned me a vtec ecu and a conversion harness to try for a day and it was nice