Couple question's, hopefully some people have answers for me

1) the difference between CTR Pistons (normal), and the Oversized ones?

2) What is the easiest rod to put the CTR pistons on to that will fit in a B16A2.

I'm not too savy when it comes to engine internals.

Thanks,
Sean

 

^^^^

 

oversized ctr pistons are either .25 or .5 mm larger in diameter than normal ctr pistons. that goes for all oem pistons that are available in normal(standard) or oversized. the reason that honda does this is so that your cylinder sleeves may be bored out .25 or .5 over the stock 81mm. this creates a fresh surface for the sleeves and allows for the rings to seal as they did from the factory.

since the b16 can only use one rod(as far as i know), you must retain the stock b16 rods. in order to use your stock rods and ctr pistons, the rods must be machined at the top because the distance between the part where the wrist pin goes on the ctr pistons is larger than the width of the b16 rod. some machine shops can machine the end of the rods for you. hope that helps.


Modified by anothersickhatch at 2:49 AM 1/5/2007

 

isn't it .25mm and .5mm or .01" and .02" ?

cause half an inch... there would be no block anymore...

 

lol...my bad. i meant millimeters.

 

I believe the CTR pistons would give you 11.0 or 11.1:1 CR which is good in the B16, but I think you need to retain the PR3 rods. If you put the CTR rod/piston assembly in the B18 then you'll have 12:1 CR. I'm sure these are the numbers, but someone with factual knowledge would chime in. I'll search and get back here.

 

Info on what to do about your rods if you are putting in CTR pistons.

https://honda-tech.com/zerothread?id=1815954

 

cool, thanks for the info guys. So is machining the rod to fit the piston bad? I hear people do it all the time so it must not be too bad right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sean @ ESG &raquo;</TD></TR><TR><TD CLASS="quote">cool, thanks for the info guys. So is machining the rod to fit the piston bad? I hear people do it all the time so it must not be too bad right?</TD></TR></TABLE>

Its mandatory. They won't fit otherwise, AFAIK.

http://www.ff-squad.com/tech/temp/pistons.htm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blaze the chemi &raquo;</TD></TR><TR><TD CLASS="quote">I believe the CTR pistons would give you 11.0 or 11.1:1 CR which is good in the B16, but I think you need to retain the PR3 rods. If you put the CTR rod/piston assembly in the B18 then you'll have 12:1 CR. I'm sure these are the numbers, but someone with factual knowledge would chime in. I'll search and get back here.</TD></TR></TABLE>

the compression ratio is a bit higher than that. omniman did a thread on here that put the compression ratio of a b16 with ctr's at about 11.6:1. ctr pistons in a b18 is over 12:1, its more like 13:1.

 

you can either shave the rod or the piston

 

lol...the JDM 2.0L B18C5. that is hilarious.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by anothersickhatch &raquo;</TD></TR><TR><TD CLASS="quote">

the compression ratio is a bit higher than that. omniman did a thread on here that put the compression ratio of a b16 with ctr's at about 11.6:1. ctr pistons in a b18 is over 12:1, its more like 13:1.</TD></TR></TABLE>
Thanks for the good info and crap that's higher than I recall. So much for regular at the gas station

 

13.09:1 in a b18c, and 13.17 in an ls

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doood &raquo;</TD></TR><TR><TD CLASS="quote">you can either shave the rod or the piston</TD></TR></TABLE>

do you know which method would be more structurally sound?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sean @ ESG &raquo;</TD></TR><TR><TD CLASS="quote">do you know which method would be more structurally sound?</TD></TR></TABLE>

really 1mm of material off each side isnt a whole lot

 

OP, have a look at this. I've been looking at getting CTR pistons myself, but i think the compression ratio is way high. Judge for yourself.

http://www.zealautowerks.com/index.html

 

dont mess with the pistons. its better to shave the rods because there is a bit of balancing that goes into the pistons themselves. i wouldnt mess with that.

 

Here is the thread everyone speaks of................ https://honda-tech.com/zerothread?id=717928

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTECommie &raquo;</TD></TR><TR><TD CLASS="quote">Here is the thread everyone speaks of................ https://honda-tech.com/zerothread?id=717928</TD></TR></TABLE>

this thread down plays the effectiveness of the higher cr you get from using CTR pistons.

In a B16a2 block/head, what would be an ideal CR and piston to achieve it with for a mild n/a setup then? It seems like with the CTR you get too high of a cr to daily with (12~ range). I use 91 octane anyway and I have Hondata s200 and a p28 ecu. With a good tune what is the best option for a mix of mild power/reliability?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sean @ ESG &raquo;</TD></TR><TR><TD CLASS="quote">

this thread down plays the effectiveness of the higher cr you get from using CTR pistons.

In a B16a2 block/head, what would be an ideal CR and piston to achieve it with for a mild n/a setup then? It seems like with the CTR you get too high of a cr to daily with (12~ range). I use 91 octane anyway and I have Hondata s200 and a p28 ecu. With a good tune what is the best option for a mix of mild power/reliability?</TD></TR></TABLE>

keep it below 12:1 especially with crappy cali gas

 

i had a b16 with ctr's for over a year and ive never had any problems. that compression ratio should be right about what you want. theres no other piston that will give you a better compression ratio for an all-motor b16.

as long as you have a good tuner and run a cold plug (BKR7E-11), youll be fine.

 

I'm getting mixed opinions here. Is there another option for a higher compression pistons that will fit on a b16 rod for around the same price/quality.

 

not the same price. you want to go higher than ~12:1 compression?

 

as far as OEM pistons go, the CTR is the only option for the B16A. Id say go for it, with a good tuner you should be ok, even with 91 octane. if not look into aftermarket forged pistons good luck either way