i just found out after replacing the rings on my pistons that i was overbored...i always thought oem pistons only 81.25 max......and p73's can go up to 82 oem. i have geniune p73's jdm itr pistons, it's a trip. i've asked a couple people and they have heard of them, but why is it so uncommon? thanks

 

oem b-series goes to 81.25mm. I believe people are talking about aftermarket replicas.

 

no they don't.....TECH43 RACING INC. has the part numbers

 

A few months back, this guy told me he could get 81.5mm OE but only for the USDM pistons. There's no 81.5mm for any JDM pistons.

 

81.5 p73 pistons are oem replicas, the use honda part #'s. RS sells them also

 

i could be wrong...but from what i remember OE pistons come in stock bore, .25 and .5 over bore. Check with your local honda dealer or call up A&H at http://www.AHmotor.com

 

i remember a post by mike k from a long time ago. i believe he posted up about there being an oem 81.50 mm usdm p73 piston

edit
this is the only post i could find from mike k about it
https://honda-tech.com/zerothread?id=692892
but this is not the one i was thinking about...maybe it was someone else that posted about it.

 

now this has got me curious, are there truly any oem 81.5 pistons or are there people making replicas with similar part #s and if so how reliable are they? anybody got some hard facts,
T.I.A.

 

these pistons in question, the 81.5mm and 82.0mm are manufactured by the same company who makes OEM honda pistons, but they are NOT available from dealerships, just race shops. you can find out who with a search, i don't know.

but these would be a real good candidate for LS/VTEC with factory reliability and more displacement. the 82.0mm would make for a small 1.9 liter, and easily 140tq on the dyno, tuned properly.

 

oem is only 81mm and 81.25mm

the 81.5 and 82mm itr pistons are oem copies

RS machines sell them

and 82mm would be great for anyone doing a lsvtec with stock sleeves mak ing it a 1.9

 

i have a set of these ill be running in my gsr build up which is close to completion ill let u guys know how it comes out when i finish it

 

sorry to bump an old thread, but since i have OEM P73 pistons

box number[s]are 13010-p73-j00 these would be in standard bore at 81mm right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ceLtic &raquo;</TD></TR><TR><TD CLASS="quote">sorry to bump an old thread, but since i have OEM P73 pistons

box number[s]are 13010-p73-j00 these would be in standard bore at 81mm right? </TD></TR></TABLE>


correct

13020-p73-j00 are oversized
13010-p73-j00 are std bore

 

camp1320.com has 81.5mm pistons in stock

 

Isnt it Topline who make the copies?

 

There is topline and there is nippon


I give to people that try to sell them as OEM honda


Cheap alternative pistons... but still not OEM honda

 

does anyone no how much these pistons run.. becuz im doing an ls/vtec and bigger bore might do me some good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by specie &raquo;</TD></TR><TR><TD CLASS="quote">oem b-series goes to 81.25mm. I believe people are talking about aftermarket replicas. </TD></TR></TABLE>haha replicas?...rota's new line of conduct.