2manytoyz

ok,so im building a b18c5 and i want to raise compression to around 11.5.I have a b16 head im going to use(i have a gsr head also,but i dont like the intake)and a set of nippon b16a pistons sitting on the shelf. I really want jdm itr pistons but i dont think the available usdm itr pistons have enough compression for my pro 1 cams.

so can i drill a oil hole in the b16 piston like the itr has?

If so what size hole and exact location?

Lastly do i have another option for a reasonably priced piston set?

2manytoyz

what about ctr pistons with the oem headgasket?

raverx3m

iTrader: (1)

i have a set of jdm itr nippon pistons in 81mm

2manytoyz

are you sure there not usdm,its my understanding that only honda carries the true jdm itr pistons.
However if it really s jdm where did you buy them from? and there p-73-00?

2manytoyz

anyone? Can i just run the b16 piston on the gsr rod without issue?

GoodSkoolRevltn

you probably could. i dont see why not.Since you have everything in front of you, measure where the connecting rod meets the piston and see if they are similar. If the b16 is tighter/smaller, you may have to have your rods tapered by a machinist.

Drilling holes, who, where, and why? i really dont think its necessary to drill holes in the wrist pins, nor would it have any effect on your compression.

in my case i had to bore my block out and so i went with usdm itr pistons because those were the only bigger ones available to me that wouldnt steer my compression too far away from the original gsr pistons. Well at least in my mind.

In your case, since you got it, use it. It will raise your compression a tad, and i would seek some sort of methods of tuning to make sure itll last. Usually the rule of them is that compression ratio's can be as high as 12.5:1 before you should really start thinking about e85 or seriously altering timing. theres actually a recent thread floating around in this section about c.r's.

im going with a cometic h.g because it is reputable to me and cheaper than having golden eagle bore a oem gasket to my needs. generally people stick to oem with hondas, but ive had friends with nismo cars and used felpro h.g's that did them good, and there pretty cheap.

it sounds like a fine setup to me, and you would in the end achieve the goal you want.

GoodSkoolRevltn

and moreso theres proof in the puddin'
look at raverx3m's sig. he has basically the same setup your going for, but probably has higher compression than what your intended goals are.

raverx3m

iTrader: (1)

true mine is not completely tuned also. i have to get it retuned again. due to some issues i had to fix at the time of first tune.

check out RS machines pistons they are pretty common to use in builds .

GoodSkoolRevltn

im gonna diverge for a second. @raverx3m, what sort of software/chip ems do you use. i dont know if you've seen my "blueprinting" thread, but we were discussing the moates demonboard and so far im leaning towards that as its the cheap way out, or dropping doeee for a s300 because of the many features/add-ons, though how serious ill get into all this is still debatable. im very interested in learning and developing the ability to tune myself in time.

raverx3m

iTrader: (1)

car was tuned on crome. but like i said it was a basic tune. i had few things to fix/upgrade .
now im using neptune. and yes its a big difference. and you are paying for a product that is still alive. unlike crome where nobody really knows where the author is and if he is working on any updates or not.
never used hondata although from the software neptune and hondata are somewhat similar. crome tuning package costs about same as neptune.

learning how to tune from the internets is probably the worst thing you can do. if you have a fried that knows what to do i would suggest picking his brain.

btw moates (demon board) customer support is outstanding.

GoodSkoolRevltn

...

raverx3m

iTrader: (1)

wow now that you mentioned i didnt realize how had it is to find jdm itr pistons lol
what about ukdm b18c6 do they have 00 or a0 pistons?

2manytoyz

the holes im refering to are the oiler holes in the piston,not the wrist pin.The itr and ctr pistons come with them.b16s dont. I think i will drill them,in the same position and size as the irt pistons,im running oil squirters so i might as well use them.

just trying to up my compression without spending big bux,basicly is looks like 10.6 or 12.5- too bad nippon didnt make one in between.

raverx3m

iTrader: (1)

The rs machines pistons have them even for b16 i think

2manytoyz

they do not,im not so sure they are not simply selling nippon pistons-i dont see any difference between them and the ones on fleabay

egb18c5

what made you come to the conclusion that this modification needs to be done? if this modification needed to be done, it would have been realized a long time ago in ALL the motors that utilized this piston.

raverx3m

iTrader: (1)

probably alluminum grade is not same.might be same casting but not same quality material.thats why alot of cheap knockoff parts fall apart. because the design was for higher grade metal. when they copy it sometimes they dont care to check what alloy was used to make the part. so it cracks and bends and wears of faster than good quality part.

2manytoyz

well since im building a b18c block,i figured i would use the oil squirters. Im not thinking it will be a bad idea,there isnt a flat cast into the pistons like the itr.

I do have a few other questions though-will the b16 wrist pin area being wider cause problems with the gsr rod?

and does the irt have different oil control properties,like the holes on the oil ring area.

any other input-thanks