Well the head parts are in and its time for a piston choice. I have been going back and forth on this idea searching and talking and need an answer soon.

Current Setup:
JDM B18C
SKunk 2 PRO 2s
Skunk 2 PRO valvesprings retainers
Skunk 2 Cam gears
Hondata s200
NOS 60 Shot
I/H/E

Now the cams arent in just yet, but i have heard that this motor stock does not have enough compression to run these, and then I have heard of people who are running them and getting great outcomes on stock compression.

I want the highest compression possible, but this motor will see nitrous, and its becoming hard for me to find any pistons over 11.0 that are rated for nitrous. I know there are pistons out there that can run high and nitrous.

What is it gonna be?

 

no one? bump.

 

Wiseco 5cc pistons will get you right to 11.1:1. But i suspect that your going to need more than that for your setup. I would shoot for 11.8:1 if it was not for the nitrous, some say it is completely safe to run higher compression on nitrous I have no experiance with it myself. You can get to 11.8:1 by running the above mentioned wiseco pistons and having your block decked .020".

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Natural Aspirations &raquo;</TD></TR><TR><TD CLASS="quote">Wiseco 5cc pistons will get you right to 11.1:1. But i suspect that your going to need more than that for your setup. I would shoot for 11.8:1 if it was not for the nitrous, some say it is completely safe to run higher compression on nitrous I have no experiance with it myself. You can get to 11.8:1 by running the above mentioned wiseco pistons and having your block decked .020".</TD></TR></TABLE>

 

Wouldn't JDM ITR pistons put u around 11.5:1? Or am I wrong? Don't mean to thread jack, but those are the pistons I planning to run on my B18C1 using Buddy Club Spec 4 cams....what c/r do JDM ITR pistons put you at?

 

JDM ITR would be good the only thing your gonna need to worry about is valve to piston clearance.

running an aftermarket forged piston would be nice only except that you will need to put aftermarket rods too then the $$$$ starts adding up

I have seen some people slightly open up the vavle pockets with a porting bit.. erick's racing use to do that...

you will definately need to change your pistons the quesiton is how much you looking to spend ..?? cast itr ctr or sir pistons are cheap and would work fine but the cams might be a lil too big.. if yo know how to clay a motor that would be great

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by camp1320.com &raquo;</TD></TR><TR><TD CLASS="quote">JDM ITR would be good the only thing your gonna need to worry about is valve to piston clearance.

running an aftermarket forged piston would be nice only except that you will need to put aftermarket rods too then the $$$$ starts adding up

I have seen some people slightly open up the vavle pockets with a porting bit.. erick's racing use to do that...

you will definately need to change your pistons the quesiton is how much you looking to spend ..?? cast itr ctr or sir pistons are cheap and would work fine but the cams might be a lil too big.. if yo know how to clay a motor that would be great</TD></TR></TABLE>

so should I clay my motor and have machine work done or should I just run Buddy Club Spec III cams? I wanna fall in between the 205-220 whp range.

 

if they're JDM pistons it will be 11.1:1 anyway


(the P73-00's)

 

No one saw that this guy wants to run PRO 2's w/ nitrous? Yikes.

 

I have heard the pro2s on n20 is safe, you dont think?

 

big NA cams dont work well with nitrous.

but 11:1 is fine w/the pro2's

 

does the motor still need to be clayed?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">big NA cams dont work well with nitrous.

but 11:1 is fine w/the pro2's</TD></TR></TABLE>


why dont they work well with nitrous? i am just curious.

 

If I were to drop the nitrous and run high comp 13.1 what kind of numbers are we looking at?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKB18C97 &raquo;</TD></TR><TR><TD CLASS="quote">If I were to drop the nitrous and run high comp 13.1 what kind of numbers are we looking at?</TD></TR></TABLE>

plan on running race gas?

i say dump the spray and get a set of 82mm p30s from rsmachine which will put you at around 12:1. just a little more dome than a p73j

 

so with JDM P73s I will have to clay the motor if I run BC Spec IV's or do I have to switch my approach now and go with Spec III's? I wanna hit in between 205 and 220 whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1JDMDOMINICAN &raquo;</TD></TR><TR><TD CLASS="quote">so with JDM P73s I will have to clay the motor if I run BC Spec IV's or do I have to switch my approach now and go with Spec III's? I wanna hit in between 205 and 220 whp.</TD></TR></TABLE>

no need to clay, just applied mathmatics. ask combustion contraption or bambam. many know, they are jsut 2 that are halfway nice enough to answer.

BTW, bambam ran an 89mm lsv with BC4 and had no probs so youre more than safe with an 87.2mm motor. and expect power to be on the low side of your expectations which is 205

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xDEFTONESx &raquo;</TD></TR><TR><TD CLASS="quote">no need to clay, just applied mathmatics. ask combustion contraption or bambam. many know, they are jsut 2 that are halfway nice enough to answer.

BTW, bambam ran an 89mm lsv with BC4 and had no probs so youre more than safe with an 87.2mm motor. and expect power to be on the low side of your expectations which is 205</TD></TR></TABLE>

Correct. PLENTLY of clearance. As for the cams, it's not necessarilly that it's not safe to run the PRO 2's, but you will be fighting your nitrous with those cams. You don't want the high duration, much like when selecting a set of turbo cams. Some of the spray will just go right through the motor on overlap. You can run them, but plan on doing some major cam gear adjustments to compensate.
For example, if you run the pro 2's, you may only see a 100 whp increase when you're spraying a 150 shot. Get it?


Modified by bambam at 1:42 PM 12/22/2006

 

Spraying on OEM pistons may not be your best choice.

 

ive had bad experiences oem pistons all together even without nitrous...i would use JE or wiseco..its worth the extra money

 

Ehhh....I like cast pistons better. Generally, you can make more power on them in the same compression range as a forged piston. The only problem is, you are more limited on compression choices. You also need to tune a little more conservatively on cast pistons.