ZC DOHC head on a D16a6 SOHC block.

[remoer]

ok as some of ya know i just bought a full complete ZC dohc head for $20 and i've been doing some research of what it takes to slapping the zc head on the a6 block. i've seen JDMEF7 do it for a turbo setup and other ppl do it too. but i've never seen it done or an all-motor build(alot more headaches). i want to thanks to JDMEF7, jlicrx and Don(SOHCinWA) for give some tech advice. oh Don thanks for smackin me back to reality on aim yesterday. lol. so here's what you would see and need to know before you think of doing this type on build.

first my JDM ZC DOHC head top and bottom valve look.

http://i31.photobucket.com/albums/c356/remoer/zchead.jpg

http://i31.photobucket.com/albums/c356/remoer/zcvalves1.jpg

my D16a6 block w/o pistons and a D16y7/8 head gasket.

http://i31.photobucket.com/albums/c356/remoer/a6blockbare.jpg

and the ZC head w/the 7/8 hg on.

http://i31.photobucket.com/albums/c356/remoer/zcvalves.jpg

and close views of the hg head bolt holes line up.

http://i31.photobucket.com/albums/c356/remoer/boltgap2.jpg

http://i31.photobucket.com/albums/c356/remoer/boltgap1.jpg

http://i31.photobucket.com/albums/c356/remoer/boltgap.jpg

[ryan89crx]

that last pic would kind of scare me. although the rest doesnt look all that bad

this is the first time ive actually seen a sohc HG laid onto a dohc head

[remoer]

ok now you've see the line up of the bolts now here's the line up of the hg. as you can see the D16y7/8 doesn't line up w/the head, it leans more to the intake side like .125mm towards the intake. but it sit pretty on the block.

http://i31.photobucket.com/albums/c356/remoer/hgcaliper.jpg

so i guess you won't be seeing this in my car.

http://i31.photobucket.com/albums/c356/remoer/zcheadwitha6block1.jpg

so the cool thing is i have extra of these.

http://i31.photobucket.com/albums/c356/remoer/sohheads.jpg

and you'll have a good chance of seeing this in my ride.

http://i31.photobucket.com/albums/c356/remoer/a6blocks.jpg

but since money is short and tight it'll stay in storage till i get straight.

http://i31.photobucket.com/albums/c356/remoer/storage.jpg

and for ya fairys that think i'm bullshing on my build here's my dd rex interior.

http://i31.photobucket.com/albums/c356/remoer/stripinterior.jpg

i will thanks the guys and the ghey guys on honda tech and the cool ppl on zcr.com. :TU:

[Toddnos]

you sux at life remo....

[Toddnos]

so what motor is actual powering the car now?

[AllMotorDPower]

a hamster on a wheel ????

[remoer]

D15b2. but i will throw in my 272 cam w/a y7/8 cam gear, a short ram this weekend and maybe my DC Sport Header. i have to see.

[remoer]

a hamster on a wheel ????
you can say that. lol.

[AllMotorDPower]

yea i guess i can :) good luck with it though

[eddcartes]

go remo go!

[remoer]

go remo go!

sorry i'm not doing the vinalla ice go ninja go dance. lmao.:D

[AllMotorDPower]

lmao go ninja go i havent heard that shit in like 50 bagillion years

[JDMEF7]

Um,, ok where do I start.....

You PM'd me saying "Tell me where and how to?"
Well I need a little more info first.

I'm not sure that you read my post closely enough because just scanning through your pics up there I've noticed a few fairly major problems.
The main problem being what block is that? it looks like a closed deck! And if it is then I'm sorry but without a lot of frigging around and extra machining you'r not going to get that head on it.

The ZC head is designed to be used with an open deck block like a D16a6, the water gallery holes in the block you showed there are not going to line up with the holes in the head.
(there is a chance that they might but you will have to measure and make sure very carefully, the last thing you want is poor water flow around combustion chambers where heat is concentrated)

It's fine when using an open deck block because no matter where the water galleries are in the head they will open out above the wet sleeve channel in the block.

Also you need to use a ZC head gasket, using a head gasket off another motor will completely block off some water gallery holes in the head and there will be holes in the gasket that dont line up with any holes in the head.

The oil return ports that you pointed out as a poor fit are the least important of all. They do not carry any pressure whatsoever and are only used to drain back the oil into the block which has been squirted onto the cams. As long as there is gasket material squashed between the head and the block all around both ports then you wont get any leaking.

Also the oil control jet in the block should be removed and replaced with a ZC one or drilled out to be the same size as a ZC. It measures the amount of oil sent to the valve train and effects oil pressure. (I dont have the diameter on hand sorry)


So basically you need two things before you can carry on with this project;
a) A dohc ZC head gasket
b) An open deck block
c) ZC oil control yet

I may have mis-interpreted the pic of the block, perhaps you have installed a block guard which is why it looks closed deck to me. if this is the case you need to tap it down deeper into the water channel, that way you wont get any mis-alignment problems with the waterways at the deck surface.
Also mounting the block guard deeper int he block gets it away from the combustion chamber and reduces the risk of hot-spots developing where there is not enough water present because of the block guard taking up the space.
I have a KMS developments block guard installed but it sits down about 3/8" into the block.

i've been doing some research of what it takes to slapping the zc head on the a6 block. i've seen JDMEF7 do it for a turbo setup and other ppl do it too. but i've never seen it done or an all-motor build(alot more headaches). i want to thanks to JDMEF7, jlicrx and Don(SOHCinWA) for give some tech advice.

Actually the only thing that differs between an allmotor build and mine is the pistons. I'm using Pm6's because I wanted lower compression for the turbo. If i wanted an N/A engine I would have used PM7's or P29's.
It would have made no difference to the build or it's complexity at all.

I cant really talk you through the whole thing form beginning to end, you need to get a bit more specific.

Cheers,
mike

[remoer]

you've gave alot more info soo, now i know what else i need to do.

[mindless]

you've gave alot more info soo, now i know what else i need to do.

Make it work...don't be a pussy

[remoer]

Make it work...don't be a pussy
nice. :TU: i guess it true, your are what you eat. lmao.

[MethD15]

haha the interior is almost completely stripped but you still left the tar in?!

[remoer]

haha the interior is almost completely stripped but you still left the tar in?!

working on it slappy squirrel.

[JDMEF7]

Remoer:
I just had another look at your pics, What I thought was a closed deck block is actually the metal of the gasket so you are on the right track with the block after all!!

All you need to do is drill out the oil control valve (I didn't bother and have had no problems yet at all but I should have done it to be safe)

And get a ZC head gasket, use the gasket to re-drill the one hole thats the most off centre. (be careful not to break through into the water jacket)
One thing to remember is that the ZC uses 11mm head bolts and the D16a uses 10mm, there are actually three holes which are off centre but the two least mis-aligned holes are ok because by the time you put the 10mm bolt through it'll be fine.

The reason i drilled all the holes in the head out to 14mm was because i increased the headstud size to 12mm because I didn't trust the pussy little 10mm ones and I wanted the correct lengths. (the 10mm ones form the D16a6 are only 155mm and the ZC needs them to be a bit longer)
No big deal though because your local engineering supply hardware store should be able to provide you with 12.9 grade 10mm cap screws with a 1.25 thread pitch.
If they dont stock metric I'm sure they will be able to order them in for you.
Measure your head hole depth for each hole and add the washer thickness, gasket thickness and thread depth in the block to get the correct bolt lengths. (Make sure you leave enough room at the bottom so the bolts dont bottom out in the thread)

Good luck with it, and like he said ^^ dont be a pussy. :D

[remoer]

i didn't say i wasn't going to go it i just wanted to do a little more research befor i go at it, plus i want to finish my motor i have right now. i've already talk to my good friend this will be a project we will do together cause i don't want to fuck anything.

so if i went with a 12mmX1.25X? what length should i go for. i would feel i should go w/the ZC legthen?

[JDMEF7]

so if i went with a 12mmX1.25X? what length should i go for. i would feel i should go w/the ZC legthen?

The 12mm bolts are 1.75pitch it's the 10mm ones which are 1.25 and the stock ZC 11mm ones are 1.5mm.
I had to go up to a 12mm as there is not enough meat there to bore out a 10mm thread to 11mm to use the stock zc bolts. Otherwise i would have just stayed with the 11mm ones.
Also you cant use the same lengthsas the 11mm ZC bolts because they are not available in those same lengths.
Also if you measure the thread depths in all the holes they are all different, all the bolts bar one are the same lenght so some end up with more thread in the block than others, sizing them all individually like I did means all the bolts have the same amoutn of used thread.

You'll find the research is not that nessessary if you just get stuck in and try it. Just dont rush it.
cheers.

[94dxcoupe]

i don't exactly have any helpful input. but, if you don't end up using that head man, i would love to put it on my b7. let me know if you want to get rid of it! JakeAuf@gmail.com

[remoer]

you're a noob i wouldn't be able to talk to you about anything for sale till you're have 65 post and i wouldn't want you to be banned either.

[jetlag1992si]

Good luck with it

[sk8bdr15]

How has this combination holding up is it still running, any pros and cons?

[remoer]

How has this combination holding up is it still running, any pros and cons?checks JDMEF7 thread on his motor.

[JDMEF7]

Yep mines still going strong, no issues at all so far so good.

[na/allday]

can a dohc zc head go on a sohc zc non tec block. my buddys mechanic said it can be done and he can do it.

[QBANBOY407]

i have a a6 block if u need 1!

[jlicrx]

can a dohc zc head go on a sohc zc non tec block. my buddys mechanic said it can be done and he can do it.
yes, with a lot of precise machine work - go here:

http://www.d-series.org/forums/showthread.php?t=47496

[EP3Moschini]

remo fix your pics or ban. . . . :booty: