Hi HT, I have some questions that might have been asked but oh well lol anyways I was thinking of getting a full d16a6 block and put a y8 head on it and keep the a6 tranny. Also get a p28 ecu.. This would work right? and can someone just tell me all that I need to make it vtec wise. And I saw somewhere that you could put DOHC ZC pistons will drop in the a6 block and then chip the ecu and tune the car? the guy responded on his youtube page and said that the ZC pistons would drop right in the a6 block and he said for me to get arp head studs and an oem head gasket (assuming a y8 one..) So what does everyone think. i know compression will be like 13 to 1 but I wont be romping it all the time. Please answer and help me because if this is ok then when I buy the motor Im goin through with this. Thanks!

 

compression 13:1???? where do you get these numbers from???

 

and to answer your other questions, all of the answers are in the FAQ's in the EF part of the forum. It has the link to show how to convert your car to obd1, how to wire in vtec, and pretty much all the other things you might have questions about.

 

there was a website that i found a link to that you could select the block, head, head gasket and pistons you are running hit calculate and it shows it.. Im trying to find it again but I dont remember where it was

 

Link please? I dont like looking throught these forums I get lost lol

 

actually maybe i shouldn't have spoken before doing the math. now that I have looked at all things considered, it will be pretty high. retract previous statement, lol. it just didn't sound right that it would be that high.

 

you lazy bastard, lol. <------------meant in joking manner.

here is the link to the FAQ's.

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/88-91-crx-ef-civic-frequently-asked-questions-faqs-1508680/

hope that helps.

 

and for anyone else that might doubt it, here are the specs he's looking at.

A6 block : 75mm bore 90mm stroke
Y8 head : Combustion Chamber Volume 32.8cc/cylinder
PM7 Piston : 7.2cc of displacement/piston
Headgasket Thickness : .025" if using a 2 layer
Piston to Deck Height : .04"

after all of that taken into consideration the C/R will be 13.1:1....................WOW

if you get an OEM headgasket it is .037" and will drop your compression to 12.6:1

 

HAHA its all good bro ^ but ya its gunna be up there. Anyone have a comment on this setup? will it actually work?

 

the reason it woulld be so high is that the Y8 has a square ish combustion chamber compared to the Z6. add to that the Domed PM7 pistons and a Y8 HG and you get stupid high compression. I would run the Z6 myself. Its a better head. If you really wanted that much higher compression then have the Z6 chambers welded like the Y8.

Good luck! i been wanting to do this for a long time now. Oh yeah, ITB's on this set up would be nice!

 

So the a6 block and z6 head with the DOHC zc pistons and the z6 stock head gasket?.. hmm sounds good too

would i need p2p ecu or p28? does it matter? and chipped/tuned?

 

here is the link for the comprerrion stuff.. this is cool

http://www.c-speedracing.com/howto/c...c/compcalc.php

but this time i did a6 block with z6 head and the ome gasket with zc pistons and that thing 13.6:1!!! whoa.. ill have to mess with it to see what i like. i found a way to get it twelve something but ya.. crazy stuff lol

 

For that kind of compression i would deinately run a chipped P06 or a P28. let me verify the compression. Dont remember it beign so high when i calculated it.

 

I got 12.7 CR with piston to dec height from a d15b7-d16a6 selected. Z6 Gasket, PM7 Pistons, Z6 head and a d16a block.

still pretty high.

 

I think I found what I might run.. a6 block, y8 head, a6 piston, y8 two layer gasket and y8 piston to deck height, It will be 10.4:1 and on the other hand if i switch the head and piston deck height to z6 and use two layer y8 gasket it will be 10.7:1 .. so would a two layer y8 gasket work with a z6 head and z6 piston to deck height? if so i might go with that.. but either of them would be ok i think. what do all you think?

 

damn, the setup i was planning to do made 13.12:1 comp. ratio. Does anyone know if that would even be reliable for just weekend use? Has anyone dynoed a mini me with zc pistons?

 

my brother had a a6 block + PM7 piston + y8 head + y8 head gasket. it ran extreme.
it sounded pretty freakin crazy too. i dont have any videos but we had built the engine, started the engine and even drove it around for like 20miles. (it was meant for track use). we ran 100 octane just to be on the safe side. but the engine definitely ran with no problem.

we later parted the track car and sold the engine for $400 bucks because the car was just taking up space and not doing what it was meant to be for. dont know what happen to it after. im sure it blew some where down the road. for sure its not meant for street use. becareful!

 

btw this is what happen to my stock a6 head/block with ZC pistons.
ran 91octane but still didnt seem enough for the thing...

 

iirc you need to run the correct head gasket for the particular head, meaning y8 head - y8 head gasket, z6 head - z6 head gasket, ect...

 

um that is highly incorrect sir. i have a mini me right now a6 block z6 head running a mls >A6< HG with p29's in there, chipped p28 ecu runnin 11:1 cr @ 3500 feet you do not need the exaxt gqasket for that head in a nut shell

 

highly incorrect, as compared to lowly incorrect? wasn't aware that there were different levels of incorrectness, lol. maybe it was the other way around then, running the correct head gasket for the block, it's been a while since i've messed with different block/head combos.

 

[QUOTE=CRXguy_88; so would a two layer y8 gasket work with a z6 head and z6 piston to deck height?[/QUOTE]

So would this work or do i need to match head with gasket.. i mean they all are d-series so can anyone clear this up for me thanks because if it doesnt work them my CR will be lower most likely. I would like to be high 10 to 11 range so its a good safe setup cuz Ill daily drive it. thanks

 

i guess i went over board id say i was a more medeium incorrect

 

So....

 

ok what im doing is getting a full swap from a crx si included wiring/ecu. and taking out everything involved with my d15b2.. and putting that d16a6 in my car and adding a z6 head and keep the stock si ecu and wiring harness ( or would i need a p28 ecu and different wiring? or no). So could i use the si wiring harness and ecu with adding the z6 stuff and be ok or no. I would like to know with this dpfi to mpfi thing also. Will it not be a problem to me in this situation.. thanks all