I am about to buy some ctr pistons for my stock as of now B16A (Sir-II). I was wondering if anybody that is running or has ran ctr pistons in a stock b16 has had any problems with detonation. Did you run pump gas ( 93 octance ) or did you ever have to add octane boost or anything. I just want to make sure before I put them in. I know about having to modify my rods a little bit already so I'm just wanting to know if anyone experienced any detonation. Thanks

 

I personally do not run this setup, but some friends do. No problems that I have heard of. No detonation, and still run 93 pump gas...


Jason

 

well there is no chance of having detonation with ctr pistons with a b16a block you will have 10.8 comp just like the real ctr sooo jst relax. and use 93 octane lie allways

 

The CTR pistons up the compression to 11:1 though not 10.8. But, thanks for info guys, I should be getting them soon.

 

I thought it was higher than 11.1:1. My calculations show about 11.4-11.6:1...


Jason

 

Well, if so then that's even better!! I was just going by what I saw on JDMHondaParts about the compression, I really don't know how to calculate it, but thanks.

 

The CTR pistons are not a straight drop into the B16a, you have to do some work to either the
rods or the piston walls. I forget what you have to do, but they don't go right in. I read this on line
and it's in the new HondaTuning mag.

 

Yea, I know about the rods, thats why I stated in my first post that I know I have to do rod modifying.

 

someone find me the the crt rod lenghth i have never seen what it is. the crt and have the same r/s ratio same bore same combustion chamber, same stroke, i just need to know the rod lenghth.

 

Get the .25 oversized ctr pistons and have the machine shop hone it out to fit the block because your block is not perfectly round.

 

I hope my block isn't perfectly round . but I'm not getting the oversized pistons because I'm getting a great deal on just regular CTR pistons.

 

If you get the over bore you'll lose CR. So Over bore would have to be if you really
need it.

 

I'm not getting the overbore. Im getting just regular CTR pistons, not .25 over.

 

I used non-overbore CTR pistons on my JDM 1st gen b16a, and have been very happy although have to say my cylinder walls in very good shape & looked like the Japanese did not run that motor too hard. You could still do a clean hone & keep same bore diameter... had a machine shop clearance the ends of the rods 1 mm for fit on the inside of the CTR pistons for $40..

We had heard CR of 10.89 but it seems to be higher - like maybe 11.5 or so...

 

i hear that they yield 11.1:1 in B16A motors, i would buy the overbore, i looked at my cylinder walls and they looked mint, upon measuring them they were over factory service limits. its easier to oversize than have crappy ring end gap. also overbore CTR pistons shouldnt cost anymore than standard.

 

Well, my motor only had around 30k miles on it when I got it, so my cylinder walls are in great shape and I doubt are over factory specs and I am getting a deal on regular ctr pistons, not the overbore, I dont have a choice, I either get them while I can get the deal for regular non-overbore ctr pistons or dont get any at all. And I hope I find someone to do my rods for only 40 dollars like one guy said earlier. I'll probably put up a post with my results in a month once we get everything settled and bought and put in. I hope I get the 11.5 cr because I've heard for sure they will at least yield 11.1 but all motors are a lil different. Thanks everyone.


[Modified by DOHC93DxCoupe, 6:10 AM 2/25/2002]

 

A real CTR is not a B16A block. It is a B18C block that has been destroked.

CTR rod length is 143mm

C/R of a real CTR is well above 10.8:1

CTR pistons in your B16A block is 11.0:1




[Modified by B18C-EJ1, 10:51 PM 2/24/2002]

 

turns out those pistons were oversized, so i guess it dont matter, oh well, guess its back to looking for something else

 

bore it and hone it, its not hard. just buy the oversized pistons.

 

well, i would buy them but i dont want to do major block work to my b16, im looking for a b18 or b20 block to use to build on the side, i was just going to get the ctr pistons because my friend was getting a good deal, but since they were oversized im not willing to have to pull my whole motor for something im not even going to keep in there, even if i was to keep my b16 block, i would have it bored out more than just the size enough for the oversized ctr's and run like a 12.5:1 compression piston or something of that nature with at least a 84mm bore if not a little more

 

what will be the bore if i put in .25over CTR pistons in my b16 block.. what kinda modifications will i have to do with the rods? i wanna get that **** in.. i got basically a poormans type R motor minus .2 liters... i wanna get my comp to at least a 11.0... i'm shooting 65 shot nitrous also:D

 

poormans ITR is a B16 head on a B18C1 block. CTR pistons should yield about 11.1:1 CR in a B16. .25mm over pistons is equal to .010 inches. the piston mod is that the piston wrist pin locations need to b widened 1mm on each side (if i remember correctly)

 

I have CTR pistons in my B16A. So far no signs of problem.

 

yeah i know that.. thas why i said minus .2 liters.. anyways.. so i gotta widen the rod 1mm? cuz i wanna get these in my b16 block.. i need more power!!! if anyone could give me a site for this info it would help alot.. thanks..!

 

ah.....all of the misinformation!

The CTR rods are their own special little rod. They are slightly longler than the b16 rods(not sure how much). The compression will be close to 11:1. What? You don't believe me? Try this...
http://www.bojangz.com/calculator/

And you have to shave the side of the rods where teh pins go through to fit the R pistons. Also, if you're replacing pistons and rings you have to hone the block anyways, so you might as well have the block bored to git the overbore pistons.