D15b8 8 Valve for Mini-me
 

Alot of people say a Mini-me HF/CX cant be done.. but can it?

Well yesterday I did a head gasket on a friends car (94 Civic CX) D15b8. And when I took the head off, I noticed it had 4 valve relief's in the top of the pistons. I thought this was a bit odd since the head only had 8 valves. So with this beeing said, I dont see why you couldnt put a z6 or even a y8 head on this engine, and have a mini-me. Lol, if you were to put a z6 head/intake and a nice header with the correct ecu, you would get over a 40hp gain on this setup since the b8 head blows ass... lol

I will check the D15b6 (HF) to see if its the same as well..


Jeff

Re:D15b8 8 Valve for Mini-me
 

dude i have an HF motor on my floor in my garage, it doesnt have 4 valve relifs only two...

Re:D15b8 8 Valve for Mini-me
 

do you think maybe honda limited their production of pistons only to those with valve relief with the 92+ civics? I mean, if they aren't making many engines with just the 8 valves, it's not as practical to have separate piston molds as compared to a few years before, when more engines were 8-valve. would 16v pistons affect performace in an 8-valve engine. Sorry, doesn't necesarily address the question, just thought I'd comment.

Re:D15b8 8 Valve for Mini-me
 

putting a z6 or y6 on a HF would do what to compression? lower it would be my guess? good for turbo, bad for NA

Re:D15b8 8 Valve for Mini-me
 

Well, from what they're saying, you can't put it on an HF, because there are only 2 valve reliefs ont he pistons.

I'm sure it would raise the compression... that tiny fraction of a second before it bent all of your valves. :)

You'd have to swap out pistons, at least.. It'd be easier just to find a DX shortblock for like $75.. Compression is rumored to be higher with the D15B2 than with the A6.. 11.2:1 or so I hear..

For an N/A setup, I wonder what you produce more hp: The higher compression of the B2, or the larger displacement and moderate compression raise of the A6.. Interesting..

Re:D15b8 8 Valve for Mini-me
 

i got a buddy of mine who has an HF with a DX head on it...and a SI intake....and a few other odd's and ends here and there...nothing spectacular....he is pushing out 109hp to the wheels....its pretty much pushin out what a stock SI motor has.....here is a link with a lil more info on the subject

http://www.hondaswap.com/articles/viewer.php?id=52

Re:D15b8 8 Valve for Mini-me
 

Interesting.. Did he look at his pistons first?

From what is sounds like, the HF is an 8 valve engine. Meaning there would only be two valve reliefs per piston, the DX he used would still have to be 8 valve..

Hrm.. Can someone find some hard facts about this?

Re:D15b8 8 Valve for Mini-me
 

next time I run out to the barn I will take the HF head off and check out the pistons on the d15b6. Somone needs to find the CC of that head, and we then can calculate C/R's with z6 and y8 heads.

Re:D15b8 8 Valve for Mini-me
 

check out http://www.npr-america.com/catalog/honda.htm#3

Re:D15b8 8 Valve for Mini-me
 

i dont know exactly what dx head he used but its a dx head with an SI intake...he is also running an 89 teg ecu...damn thing hauls ass i say....i was gonna do this to my HF but then i discovered with a lil more funds i can have a B series....now ive finally aquired all of this...just ordered some hasport mounts today and in a few weeks when i can afford it im gonna get the shift linkage...