VTEC head on a D15B7?
 

hey guys I am still learning as I go along here with the Honda engine technical specs, so I was wondering what could potentially be done with my D15B7 in my Civic. It is a 1.5 litre non-vtec, and I was wondering if there are any VTEC cylinder heads that fit right on in place of my stock head. It would probably have to be from an older D-series engine than the ones offered in 92-95 Civics, because they only offered VTEC in the 1.6 litre in those years. Any serious mods involved in a head swap? new timing belt obviously....

Re:VTEC head on a D15B7?
 

That would be called the "mini-me" putting a sohc vtec head on a non-vtec block. It works very well.

You can use the d16z6 92-95 civic head or the d16y8 96-99 vtec head.

The y8 will yeild a bit more compression but not much, the z6 head supposivly flows better anyhow.

You will need a Civic VX timing belt if you do the swap to your 1.5l.

You will also need to remove the oil oriface jet on the face of the deck (between cylinders 2 & 3) comes out with a screw driver. If you dont you wont have vtec.

I recommend using the 92-95 D16z6 head gasket for the swap, since its one of the nicer factory honda head gaskets.

The compression will be about 10.5/10.8ish.. with the z6 head.

I'm not a mini-me expert, I have only done a few.. But they seem to work out pretty well, Do a search on yahoo, or honda-tech I bet alot of people have write up's on them. As far as management goes, I am pretty sure you can just run the P28 vtec ecu, and run the according wires.

Good luck,
Jeff Frank

Re:VTEC head on a D15B7?
 

I have read that VTEC incorporates the use of an additional set of intake runners which open upon VTEC activation, allowing better airflow to comply with the aggressive cam profiles (see Honda Bulider's Handbook, P. 37). Is this only on the DOHC VTEC's, or on all of them?

Also, would I benefit significantly from a larger throttle body on a Mini-me setup, perhaps one from our very own Proflow Design?

Re:VTEC head on a D15B7?
 

D-series doenst have the duel runners in the plenums. For B-series its on the GSR B18c and some H-series engines have them as well (others maybe...)

Would you benifit? you bet, In fact since you have the 92+ intake manifold I beleive you can swap on B-series throttle bodys onto your intake manifold. You may need to ask Jim about that one.

But yea, get your hands on a GSR T-body and get it bored out by proflow to 64mm

https://www.homemadeturbo.com/tech_p...ntake-tb_P.jpg

I am very satisfied with my T-body.. Jim does great work

Jeff

Re:VTEC head on a D15B7?
 

Is the D16z6 the 127-HP VTEC that came on 92-95 EX Civics? I got the idea that's the engine you refer to. Can I expect lower power output than a full D16z6 engine block and head, because i am running 0.1 litres of displacement less? Also, is the P28 ECU from these 92-95 EX's? I guess I would need a new ECU or else my car would never know when to begin VTEC. There is some D16z6 stuff a guy is selling here in the Classifieds Forum, basically the cylinder head, intake manifold, throttle body, cam gear, and fuel rail. I wouldn't need any D16z6 intake, fuel rail, or injectors would I? It's not like my fuel consumption will really shoot up that much...

Re:VTEC head on a D15B7?
 

"Is the D16z6 the 127-HP VTEC that came on 92-95 EX Civics?"

Yes

"Can I expect lower power output than a full D16z6 engine block and head, because i am running 0.1 litres of displacement less?"

Actually it will be pretty similar, since the compression is being rasied up a bit, give or take 5-10hp..

" is the P28 ECU from these 92-95 EX's?"

Yes

" wouldn't need any D16z6 intake, fuel rail, or injectors would I?"

You dont have to run the z6 intake, it supposivly flows a bit better. The rail and the injectors are the same so no worries.

Actually, I think some of the 92 d15b2's have hold and peak injectors if I am not mistaken..?

Jeff

Re:VTEC head on a D15B7?
 

what is the VTEC solenoid, does it control the activation of VTEC between the engine speed and cam adjustments? would that come in a used cylinder head? How about the CAM gear I should use? Sorry for so many questions, thanx for your quick replies, Jeff! :)

Re:VTEC head on a D15B7?
 

"what is the VTEC solenoid, does it control the activation of VTEC"

Yes at a certain RPM, when the ecu is within all parameters, the vtec solinoid will engauge and let oil flow through the (---- whats the term ? hmm) Basically it will lock the pin on the secondary follower to run off the larger cam profile.

Normally that would come on the vtec head.. (normally)

"How about the CAM gear I should use?"

Just use the stock D16z6 cam gear with the VX timing belt and you will be fine. If you are talking about getting an adjustable one.. ---- that, single cams hardly make a difference with one. Its like you gain power from one area but it will sacrifice it from another. Only on twin cams can that really be useful.

and david spade is a faggit, get rid of that avatar ::)

Jeff Frank

Re:VTEC head on a D15B7?
 

hey thanx Jeff, in just 2 hours I feel like I have gained a wealth of knowledge on these Mini-Mi's... but don't worry, I won't let it go to my head so that I talk like I really know what's going on :) One other thing though... is a used distributor and/or ECU a bad idea? I looked at some pricing for them new, and it made a custom turbo setup look more affordable! I'm sure there are plenty of guys out theregetting rid of their stock D16Z6 stuff.... if not, I have a friend of my dad's back home who runs a used parts yard for Honda's only. It's my playground....

Re:VTEC head on a D15B7?
 

If you dont mind modifing your stock distributor, you can use your d15b7 one.. Just grind out the top pivot point and only use 1 out of 3 bolts, I have done this on lots of setups, and it works just fine.

Used stuff is a gamble, just like anything.. some stuff is good, some is crap.

Let me remind you that a Mini-me Turbo isnt the easiest car to tune in the world, and if you are doing your first turbo setup, you may want to just look into turboing the d15b7 the way it is. The high compression of the mini-me makes it very easy to mistune and detonate. Good fuel and Good spark is highly recommend.. atleast the afc hack with some large injectors and a BTM, otherwise I would say hondata for sure.

I am going to BED!

Jeff Frank