putting vtec head onto a D15 block

is that possible?
I think there is a D series motor that is vtec
??? would it be worth the time and effort and $$$?

http://www.automotiveforums.com/vbulletin/showthread.php?threadid=69562

pretty much the same putting it on a 1.5 or a 1.6...you'll just have to convert to mpfi with the 1.5... (unless you've got a hf)

It's called a mini-me swap and to me no it isn't worth the cost of gaskets and time. Atleast buy the whole dam thing and not just the head.

Originally posted by Jmunk
It's called a mini-me swap and to me no it isn't worth the cost of gaskets and time. Atleast buy the whole dam thing and not just the head.


Head = $100
Gaskets = $50
time= free

Whole motor $400 - $600

hmmmmm

results, priceless. :D j/k

Your going to need more than $150 to do it RIGHT. Yeah you can half ass it like anything else or you can do it the semi-right way.


The Mini-Me conversion. For those who don't know its a D16z6 (or D16y8) SOHC VTEC head swapped onto a D15b7 block.

What is needed? Here is the list I have so far from another site:
D15B7 block
D16Z6 head
D16Z6/D16Y8 head gasket (the D16Y8 headgasket is almost 1/2 the size of the Z6, so it will up the compression some)
Civic VX timing belt
Civic HX spark plugs (not required but recomended)
D16Z6 ecu
D16Z6 intake manifold (including fuel rail and injectors)
D16Z6 distributor

How much will it bump up compression? I've heard that using ZC pistons will further up compression, how much more are we talking?

What are the disadvantages of this swap?

I know I could probably swap in a D16 for nearly the SAME price when it's all said and done.

And here is a quote from Aggressorsol (Tim) from the del sol board on Hondavision. He knows more about D-series than anyone that i have ever talked to.

D15B's r/s ratio is better than the D16's. How do you think they dropped the displacement? The pistons are interchangeable... So that means it's a short stroke D16, with a Z6 head.

delScho's D15B in the VXi hauls fairly well, but in my honest opinion, I wouldn't do the Mini-Me swap. (and this is from the D block lover from hell) I liked the pull of the non-VTEC D15 better. The D15 on boost is about the baddest ass little whomper out there. Tachs up quick, and shifts low. Drop an Si ratio tranny in it, and it's mean package at 10 psi.

Now, what I WOULD do, is go with a D16Z6 block and head, drop in VX pistons and rods, and go to town.

ORRRR. Try this one. (the "street motor project") Take a D15B7 block. A D13 short stroke crank. A D16Z6 head w/ Zex cam. Custom ALUMINUM rods, and your choice of high compression pistons. It's a LIGHT crank, use light rods, light pistons, and a VTEC head with a high rpm profile that's oversized for the displacement. Spin the bitch to 13,000 and watch the crank fly out the bottom the first time you drop the clutch. But it'll sit on the starting line spinning 13K holding on for dear life!!

If I were you honestly, I'd just find a D16Z6 lower end to go with the head. You'll be happier. It's not worth the cost of gaskets.

Stick

What??!?!?!?!?!?
Why isnt a mini-me worth the time, 130-140 hp for the price of gaskets the head and a vtec activator.
Not to mention that the a6 block is considered the best d series block.
My plan starting sometime next week is d16y8 head, a6 block, y8 oil pump, z6 gasket, a6 distro, injectors, and ecu, with a zdyne 1 wire.

Why isnt a mini-me worth the time, 130-140 hp for the price of gaskets the head and a vtec activator

130-140hp? i belive you're a little off on those numbers. try about 110-120hp if even that much. The stock d16z6 has about 125hp so i doubt using a smaller displacement is going to ADD 15 hp :rolleyes:

I was going to have to correct him. You'll be lucky to see 115 whp. I would plan on 110 whp at best. So again NOT WORTH THE TIME, get the whole damn motor.

d16a6=102
d16y8=127
mini-me with a6 block and y8 head will at least be above 127 because of the raise in compression, why get a whole vtec engine when you get a better block and higher compression from the a6 block I already have?

that may be true if you go all the way through with it and swap up to OBD1...otherwise, the engines gonna be starved for fuel, spark, etc. with the stock ecu when the cam changes and you're not gonna see that 127...plus, that 127 is at the crank..

I started this swap and I definitely spent way more than I was planning on...so I scrapped it and got a zc.. (not to mention I broke something major...but still ;) )

I will be using the zdyne 1 wire to compensate for the missing fuel maps and so on. I am not trying to say this is the best swap out there, but dollar for dollar you get roughly 20 hp for a low price, while replacing older parts with newer better designed ones.

if you look at the original thread, he said swapping a VTEC head onto a d15 block, not a d16a6. doing the mini me swap onto a d15 block will give you less horsepower. granted, you will have higher compression, but it is a smaller displacement.

I realize that it would lower the hp with a d15, but the premise is still the same, and the question becomes for each person is it worth your time and money to do a mini-me vs any other of the swaps available. My opinion is yes, depending on how cheap you can aquire a vtec head.

So how much would it actually cost? wouldn't I have to get an mpfi also and dizzy... ecu ?

if u have a dx u have to convert to mpfi, si and i believe hf dont.

There is no replacemnet for displacement. That says it all. You want more power than you need for displacement.

I never realized that a 1.6vtec had more displacement than a mini-me.....do you even know what you are saying anymore?

A 1.6 Vtec has more displacement than and mini-me swap assuming that your using the D15 block. In order to get the same displacement as the 1.6 Vtec you would need to swap pistons the 1.6 pistons into the D15 block. As far as do i know what i am talking about i think that i know enough to comment on this. I've done enough swaps and rebuilds. In my opnion you would benefit much more from the full 1.6 Vtec motor swap. I have seen people with the mini-me swap and they had a heck of a time with getting the correct fuel mixture. It will run decent but most of the time the motor will run a bit lean without a good deal of tuning. If your going to do the head swap please do it right and don't be cheap and half ass it. You do the head swap and bring it to me and i'll get my friends CRX with the full D16y8 motor and we can see who wins. It's your money and spend it how you wand but in the long run to do it right you will be at the same cost of what the full motor would have cost you. If you do the head swap than while you got the head off you mise well take it and have it shaved like thirty-seconds, that'll give you a little boost in compression.

Bleebdat,
if u have a dx u have to convert to mpfi, si and i believe hf dont.

The HF will have the correct wiring but you will not want to use the HF intake manifold and throttle body. it is TINY compared to one off an Si. I laughed when i pulled the toothpick of an intake hose off of the quarter sized throttle body on my HF CRX heh.

You'll want to swap the intakes if it is going in an HF :D

i got a 89 crx sir two door

got dc headers stright piped intake and racing plug wires

i am going to race my friend on new years and whoever wins gets 50 bucks lol

what is the best thing to do to my car to make it fast =]]]

You could try a few things..

Get a twin charge setup, running a turbo and a JRSC.
Add to that about 300 HP worth of stick-on JDM'ness.
Don't bring up old threads.
Boost your compression to some ridiculous number only acheivable on paper and in Dyno programs, like 32:1.
Add enough NOS "to blow yaself up. Period."
Stop bringing up old threads for stupid shit... or for anything.
Watch The Fast and the Furious again.
Get ready to prove what you claim. If you have an Si-R, post pics.
Limit your posting to threads that aren't considered "decayed" b/c they're so old.
Go race on the most public street you can think of, preferably in front of the local police station. When you get caught, tell 'em DropZone sent you.
Lose your ride to public auction, where I will get notified of it's sale, buy it, and part it out.
Last but not least, don't bring up old threads anymore.Yep, that should pretty much cover it.

Oh, and read the damn FAQ and the forum guidelines... the mods didn't write them for their health.

Wow. For a sec I almost thought you were giving real advice.

C'mon now... be realistic.. when's the last time you ever saw me give REAL ADVICE? lol.

Seriously. I actually tried to make it look like there was real information in that babbling post of random nonsense.

My personal favorite is tip #2.

Got me all worked up, anything about twin charging and im all about bashing the "mythical" setup back down to reality.

Well, as far as that, it's not *mythical*. Nissan and Toyota have both used it, as has Lotus' race team, using Toyota engines.

I'll have to look it up again, but I'm pretty sure there are production cars that have twin charged setups on them on the street. Maybe not in the US, but fuck, the US has nothing compared to other countries when it comes to performance imports... Shit, even most Domestics sent their better shit to other markets... like the Ford RS200 (Escort). C'mon.. that would have been sweet as shit.

Oh I know for sure that they have been used, and that they have been in production. I just say mythical because most people think its some new and fantastic technology that will make gobs and gobs of power.. when it isnt, and it wont, not like people think anyway.

Duly Agreed. It does, however, pose an interesting basis for making power on small displacement engines. Wayyyy off topic.

Locked for the obvious.