hello all

which are the correct pistons to use on a JDM DOHC ZC engine? It's a 1991, if that makes a difference. I am getting it rebuilt and I may need to go oversize if it needs a rebore, and I want to be able to tell the machine shop guys which pistons are correct. I am hoping thet there is a USDM alternative; are the 88-89 D16A1 (Integra) pistons the same, or do they produce slightly less compression when installed?

Any info appreciated, and sorry to ask such an often discussed matter; I couldn't get any results using the search feature.

cheers

greg v

 

They are THEM.. enjoy.

 

thanks for the info

after some research, I understand that P29's (88-89 Integra) and PM7's are both considered to be the correct piston for this application. If so, do they have different part numbers? And if so, why?

just curious

thanks again

greg v

 

because they are different pistons...........

 

all the 88-89 usdm integra engines i have tore into had pg6b pistons in them.......

 

You can use any d-series piston. The bore size is 75.5mm. I bought my ZC spec. pistons from http://www.theoldone.com I haven't put them in yet cuase I just bought them but man they are awsome! Plus they got them to me in 3 days!(Which I wasen't expecting) Thumbs up to ENDYN.

 

its 75mm bro. if you got 75.5 pistons your gonna have to bore.

But yeah the 86-87 Teg pistons are PG6 and the 88-89 are P29
DOHC ZC PM7
but the PM7 and P29 pistons are identical in every way, not real sure why they changed the part #.

 

My bad I forgot about that, yeah my pistons are 75.5 and I will be boring it. Your right the stockers are 75mm.