Im kicking around the idea of building a d-series motor in school(engines class), and i have an idea of what i want to do. I just need to talk schematics with someone who knows there ****.

D16z6 block(in my car)
D16A1 pistons(increase compression?? cheap if they will fit)
D16y8 cylinder head w/ intake manifold and headgasket(better flowing head and manifold, thinner head gasket)

Now heres what im sketchy on. Ive read that the D16a1 pistons in a d16a6 (4thgenSi) block raise the comp. ratio to 11 to 1. Is it possible to run these pistons in the z6 block w/ the y8 head and get similar compression numbers? and will these pistons fit without interference w/ the valves?

Assuming these pistons will give these kind of compression numbers and are worth using, will they fit the Z6 rods or will i have to get the A1 rods?
The reason im thinking about these pistons is because i know where i can get the pistons and rods all for 40 bucks from a u-pull it yard. im deffinitely going through my motor this semester, and I figured that if they fit and they increase HP for 40 bucks and a couple of hours of my time, why not throw them in?

If this has all been covered before, if someone could please direct me to the thread or any other source for SOHC building. I did a search, but it came back with a lot of vague results, so i thought it would be more pointed to just ask.

thanks for taking the time to read this-
scott.

 

STOP!!!!!!!!!

Can't use A1 pistons with a Z6/Y8 head. They will smack pretty HARD!

 

whew!! thank you for keeping me from making a mistake..
but while we are on the subject, are there any factory honda (cheap) pistons, or for that matter, any other things i can do to boost my compression a little?
Im not looking for super-bad *** qtr mile monster or anything, but id like to see low 15's, MAYBEE high 14's(but not holding my breath with my budget) NA, while keeping the costs down but maintaining reliability.
If theres a web site or something that deals with all this or something, let me know.

 

a6 pistons will bump the compression up a bit to about .5. you might be able to use zc sohc pistons but you would need a 1.5 crank and rods from what i heard. anyone know if it would work?

 

i have built the following and it works fine..

d15b7 block (best rod / stroke ratio of any d-series honda)
milled d16z6 JG full race head with huge cam
ZC pistons
stock d15 rods

engine makes around 160-170hp @ the wheels..its a really nice setup. Its around 12:1 compression.

If you wanna do the d16z6 route...i am pretty sure you can use ZC pistons with it okay...but you arnt going to get much power outa it. The head just doesnt flow that great. (ie the full race JG head)

The only reason we made this motor is for our drag CRX (hoping for 12s ) - but thats in a car which weights 1640 pounds with driver! Its stripped!! I would go boost personally..

here is a pic of our d15 wonder head






liam

 

i should add GUDE sells they d16z6 head package for like $1300. You get a huge cam, full port and polish sohc head (milled to increase compression), port matched intake manifold, and bored throttle body. With a 4-1 header they say about a 40% increase in power with a stock bottom end!! Thats pretty awesome!! I had a friend that ran a low 13 second 1/4 mile in a 94 civic coupe with a GUDE head package and a stock bottom end (d16z6). He said he did it cuz his friends said he couldnt do it. He had the big gorilla cam from GUDE (make sure you order with that name). It sorta idled..huge cam lupe. really awesome

liam

 

wrong info again

D15Z1 has the best R/S ratio as it uses long 137 mm rods with same 84.5 mm stroke.


We won't go into the "other D's" that never made it to our shores.

 

heard wrong again.

 

the b15b7 has a 84.5mm stroke also...but a shorter rod of 134mm. Wouldnt that be better?

liam

 

134mm/84.5mm = 1.586 R/S
137mm/84.5mm = 1.621 R/S

So take a VTEC-E motor, swap in Z6 pistons for the bigger valve reliefs, and drop on a VTEC head. You now have a VTi motor which efia6c (sp?) just posted dyno results from. Add 9-10 hp to his numbers if you use a AEM intake.

Sorry about the AIM, Local area Road Runner went nutso.

 

well, i think i know where i can get a vtec-e short block for the same price it would run me to get a Y8 head.. So your saying get the vtec-e short block, swap in my Z6 pistons while its apart (pistons on to the stock vtec-e rods), and then re-use my Z6 head on to it (later a ported and polished y8head). Hmm..
Should i still use the later model metal head gasket?

Oh yeah, ive got an AEM intake..

sweet, thinks for the help guys- this is why i love this site!

 

efia6c?? did he post them in the civic section or somewhere else?




[Modified by euclidEH3, 11:38 PM 12/5/2001]