Hi All:

I'm trying to track down all of the available D series pistons to create a
worksheet and a compression calculator for each combination of piston and
head.

What I have so far:

D16A1 PG6B: 86-87 D16A1 DOHC Integra
D16A1 P29: 88-89 D16A1 DOHC Integra (I bought one of these..$35.00 ouch)
ZC PM7: 88-91 JDM ZC

What I need:

D16A6 PM6 (?): 88-91 USDM CRX Si
D16Z6 P28 (?): 92-95 SOHC VTEC
D16Y8 P2P(?): 96+ SOHC VTEC

If you have any of the above to donate, please let me know. I cannot
afford to buy every one of these! The pistons can be cracked, melted,
chipped, etc...it doesn't matter as long as they can be measured.

I will post all of my results here when they are done.

Here's what I've got so far that compares an 86-87 Integra piston to an 88-
91 JDM ZC piston.

The compression heights on these two pistons is very different. It's
about .030" higher for the 86/87 Teg piston. The ZC piston has a HUGE
dome in comparison, but since it sits lower in the cylinder, a lot of that
hugeness (is that a word?) is offset and the resulting compression
increase is quite small (about .2 points)





Sonny

 

whish i had that kind of time on my hands to do that sort of thing

 

I do it late at night after the wife is asleep.

Sonny

 

So true isn't it, but when they wake up... don't they scare you. Mine opens the door real slow to the garage and then yells,"WHAT ARE YOU DOING!!!". Scares the Sh** out of me every time.

 

LOL!! So true, man!! My wife did this to me last night. I was leaned over the bench comparing some pistons and she scared the living **** out of me. I almost had a freakin' heart attack!

Sonny

 

if you want to see a really interesting d series piston then go to your honda dealer and have them order one from a 2001 civic 4 door GX...this is the natural gas powered version and the service manual states the compression at 12.5-1...i have seen one of these...major dome compared to Y8 piston

 

i may be able to get u a a6 piston and u should look into d15 pistons also they are suposidly bigger than the a6 pistons ummm yeh ill see wut i can come up with

 

I've got a Y8 and a CRX DX (what's the code of this engine?) block sitting around. I'll take some pics of both and post them up tomorrow.

 

Sounds tight. So do you know aproximate like the CR with 85-87 integra pistons in a z6 or a6? Just curious.


Yager-

 

I have an A6 PM6 piston and rod that I'll donate...email me your shipping address and I'll send it out today or tomorrow. Way to go on doing this!

Chris, Sonic@Honda-Tech.com

 

i got d16z6 pistons laying around. im pretty sure i still have all 4. hit me up with an im or email dlric@yahoo.com.

interesting pm7 piston. i hadn't seen one before. pg7 piston (88-89 teg) domes look similiar. hmmm. cool.

i like the d-series enthusiasm.

 

Here's another pic. Notice how tall the Teg piston is compared to the ZC piston. Even though the ZC piston has a huge dome, the fact that it's compression height is much smaller (.040 smaller) offsets its dome by a huge amount.



Sonny

 

hmmmm.....when you do all these d-series piston combos in the D blocks are you gonna CC them to find out compression ratios?? or are you just comparing all the piston heights in relation to the blocks?? I have the following pistons i can test also if you want....ummm...i got

-p28 SOHC VTEC
-Pm3 (i dont know where theyre from but they have a really flush surface...no dome...no recess) i think they come from the HF
-pm6...SI 88-91 USDM

 

too bad you bought that d16a1 piston. i found one lying around when i was searching for the d16z6 piston. i'll get the z6 out to you monday.

 

so for my internally stock D16A6 which pistons provide exactly what compression ratio?????????????

 

i just bought a set of d16a1 pistons with rings, do you guys think that $240 from acura was a good price?? Im gonna put these bad boys in my a6, and DAMN they sure do have a high dome...

 

I'm working on a chart. It will be out soon.

Sonny

 

UPDATE

I received Sonic's donation of the D16A6 piston today and will measure everything up and add that to my chart. I need to remove it from the rod before I can proceed, but I should be able to do that in the next day or two at my buddy's house (he has a press).

Sonny

 

hahah thats the way to go...


Yager-