I would like to purchase a piston kit but not sure what to get for my JDM97 B18C-R.
I have Toda spec a2, cams, springs, gears, JDM98 ITR header but would like to bump my compression to 12.? and still be daily driven. Should I go with PCT pistons(CTR) with spoon rods??? What's you ITR owners suggest?

BIG THANKS in advance!!

 

u can just get a head gasket and high compression valves, and u would be close to 12.1:1 maybe like 11.8:1 without changing pistons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda &raquo;</TD></TR><TR><TD CLASS="quote">u can just get a head gasket and high compression valves, and u would be close to 12.1:1 maybe like 11.8:1 without changing pistons.</TD></TR></TABLE>
those high compression valves are a must, you're looking at +30whp with those alone

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JUN.R &raquo;</TD></TR><TR><TD CLASS="quote">those high compression valves are a must, you're looking at +30whp with those alone </TD></TR></TABLE>

Do you have dyno to prove that? lol

 

CTR pistons, while creating high compression, do not allow for optimal flame front and combustion due to the dome shape/height.

If you are going to install pistons, it would be worthwhile to upgrade to a set of forged pistons. They will allow you a wider range of error due to the ability to absorb detonation and heat. I am running +3cc CP pistons (12:1) and they perform very well, and are quiet, unlike JE.

However, you will need to tune the motor after that big of a jump in compression. Stock fuel and ignition will need to be altered to make proper power and prevent possible detonation. I'm not sure what tuning options are available in Guam, but look into Hondata.

 

Is'nt the toda a2 cam a mild cam? Looking at the spec's of the cam it seems a 11:1 to comp ratio would be good enough. Why not get the intake closing ABDC and compute for the increase in crank pressure? Just my .02 cents worth...

 

You can always gain more power from an increase in compression. Even though the TODA A2's are relatively mild, they still can benefit from an increase in compression.

I ran ITR cams for about a year in my 12.3:1 2.0L. There is no downside to running small cams with higher compression, but you must be more aware of ignition timing because the smaller cams generally have less overlap and you run the risk of detonation if no tuning is performed.

 

Thanks for the post!!
I was going to add Mugen gaskets and Skunk2 Valves. That should benefit my set-up rite??

 

Thanks for the info, and not dissing on my Toda A2 mild cams!! At least I know that higher compression would work for A2 cams.
So forged pistons are a bit better than CTR??