devingodard

So i have a dohc and sohc zc head sitting in my garage i want to slap together and possible boost. Now i have read that the dohc zc has less power and torque then the sohc? I dont see how this can be true but if anyone can confirm this or any input would be great just want to start out with the most power!! O and both heads have about 10k on them zc is imported and sat on a shelf and the sohc was rebuilt but the bottom end was screwed!!! thanks

hugoboss

i dont think you can put a sohc head on a dohc and vise versa, single with single dual with dual

devingodard

a dohc zc is the jdm version of a d16a1 which has a d block same as a y7 y8 a6 sohc zc. i was amazed when i was lookin at them and had to look into it to to find out they actually do fit!!! but while looking into it i found some guys saying the dohc only has 115 hp? others say 135? and the sohc having 127? so just tryin to get some good numbers from a reliable source!

l.d.forget

You can in some cases, i personally dont know about the ZC's, but a F22 block is damn near identical to the H22 block. H22 heads are dual cam, and f22's are single cams. You can (and people do, lots of people) put the h22a head on the f22 block.

devingodard

that spounds like a great mix!!! wouldnt mind gettin a lude to do that

l.d.forget

ludes come with H series motors, except for the few that came with a model of the f22. If you want the franken F/H (also known as G22, even though there is an actual g series motor) you would do it in the accord. Mostly done in the cb7 chassis, 90-93.

MPR

The number of cams an engine has doesn't dictate how much power it will make.

Personally, I'd use the sohc.

hugoboss

learn something new everyday

ol Dusty

iTrader: (2)

if it's a vtec head, Id use it over the dohc. boost or not. number of cams doesn't dictate power made but it is easier to make more power with 2 cams instead of one. either way, if you're building it and boosting, it's easy to get more then enough power from either motor, vtec just sounds nice when it crosses over

devingodard

i know the number of cams doesnt start you with more power well ive seen dyno charts of a dohc zc completley stock with a botched exhaust put down 115 at the wheels. which sounds like a good starting point to me . I have heard it is a pain in the *** to put the dohc zc into my car (99 civic se d16y7) i would clearly have to change the wirng and comp. but the dohc zc head should fit any d series block. does anyone know of anyone who has put a dohc zc into an ej or newer?

D.T.P

From what I remember the blocks are not the same. May be off but ill stand by my word till there is actual proof.

Swapping zc dohc in ej? Ej what? Ej1/ej2 are eg's...but you mentioned ek so ill go with that. You can use obd1 ecu and convert the iac to 4wire and ecu to obd1. Otherwise its like any swap really.

Personally I'd go with zc. Though its harder to find parts but if you source everything out then you'll be set.

devingodard

Ya i have realized that lol the guy i got the motor off of made a mess of the wiring and kept parts of it so ive been searching for a harness and its not goin so well. Now i have heard that a dohc will run on a pm6 ecu anyone ever done it b4? i plan on gettin a pm7 but until then i was just wondering.

and as far as the blocks go i had a d16a6 from an 89 crx and the two blocks look identical the only dif was the head gasket. The dohc had larger coolant openings.

My internet at home is screwed but i will try for pic of the blocks

D.T.P

I believe the corner head bolt by the dizzy is off. It's been too long i cant remember exactly...

devingodard

ok well i still have the block but there is a little ding in one cylinder wall. But mys gfs dad is a machinist. I didnt really want to get into custom pistons! hopefully i can fix it without honing to much out. Does anyone know wat the max size of the cylinder would be to keep stock pistons and rings?

ol Dusty

iTrader: (2)

hate to be a downer but really it seems like your just getting yourself into a big mess with a lot of work all to put a ~20 year old motor into a 10+ year old car. DOn't get me wrong, I'm putting a d16a1 into my 87 CRX and my other car is a 93 civic so I'm not saying anything about old cars/motors being no good, in fact I don't think as highly of new K/J/R's etc as I do the older B/D engines etc. but really I think you'd be doing yourself a favour by saving some coin and either build and/or boosting your current motor, or getting a B swap if you really wanna see a DOHC under your hood. Not only because wiring is a hassle and not fun, but also, your having problems finding parts to start with, what about when you need to replace/fix things later on. I'm guessing this is a daily driver and these may be things you want to consider.

l.d.forget

^^ speaks the truth.

devingodard

i thought of most of that and the only real reason im puttin the dohc zc in is because i have it lol. But my cousin just bought a 90 civ so i might end up sellin it to him but i dunno yet. I dont mind the wiring considering it looks like it will just be repinnning the end that goes to the cluster. Ill build the motor and get it runnin then see decide wat to do.

l.d.forget

sell it to your cousin.

devingodard

ill get it runnin then see ill keep you guys posted. But does anyone know the max size for a cylinder in order to keep the stock pistons and rings?

zeeman

iTrader: (1)

I once tuned an eg with a dohc zc turbo, it was obd1 and he was using a b16 dizzy (modified to fit) and the cam sensor on the exhaust cam wasn't used b/c its inside of the b16 dizzy.

It made good jam for what it was IMO.