the CTR's are too high of a compression for a b18a/b16a head on pump gas without a **** load of tuning.

the ITR's are said to not fit properly on the ls rods unless they are machined 1mm.

so what oem piston would give me the 11:1 compression i want on my ls/vtec so i can run some decent sized cams?

would the jdm p30's work without having to have the rods machined on my b18a bottom end with my jdm b16a head?

please post useful information....

this is going to a daily driven, often track raced motor

 

I would say search, but all the searching I've done, I don't think I've seen this answered...I have CTR's but mine isn't done yet. You COULD use a thicker head gasket to lower c/r. Correct me if I'm wrong.

-Chris

 

b16 pistons will it on ls rods without any machining

JDM b16A P30 pistons will give 11:1 compression on a stock head (stock gasket thickness, stock mill, stock combustion chamber cc)

USDM P73 itr pistons have a 3.64cc PDD yielding 10.3:1 compression.
JDM P73 itr pistons have a 5.96cc PDD, yielding 10.8:1 compression.

The JDM PCT Civic type R pistons will net you 11.4:1 compression.
the ITR and CTR pistons will NOT on a stock LS rod. The B16 pistons, do. LS and B16 rods are much wider at the top than a gsr/itr/ctr. The opposite is also true: putting a gsr/itr/ctr piston on an ls/b16 rod will yield undesireable results.

 

FINALLY!

so you say the p30's would be fine with my ls/vtec with maybe some ctr/itr cams or even maybe some buddy clubs[3+/4]?

all this with 93/94 octane available...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowsohccivic &raquo;</TD></TR><TR><TD CLASS="quote">The JDM PCT Civic type R pistons will net you 11.4:1 compression. </TD></TR></TABLE>

More like 12.8:1

More info here =&gt; https://honda-tech.com/zerothread?id=717928

 

For street car, I'd go with P30, PR3 or JDM ITR.

Having the rods machined to fit isn't a big deal at all.

 

p30s are good or what?

 

P30 is a good choice.

 

im running p30s w/ stock b16 head. runs nice w/ 93. daily driven

shotpened ls rods w/ p30 pistons , arp rod bolts, and acl bearings

 

Is it possible to run the CTR pistons and use a thicker (cometic?) head gasket and get the compression down low enough for a daily driver (tuned or untuned) on 91oct?

Thanks

Chris


Modified by EK_TNR at 5:11 PM 9/30/2004

 

i had to mod my ls rods for p30's at RS and p30's in with b16 head and b18a/b block gives you a CR of 11.544785071271803'with CTR pistons the CR will be 11.973719167158128 with all stock ... my set up is more than both because i have the head mill and a two layer HG on my CR is 12.20571303951417

I it's a daily driver and has bin for the last 6-9 mounths...and never gone to the dyno ...but i need to... you will be fine with CTR.

 

Thank you sir...btw I could have mentioned, OMNI valvetrain, stock B16 cams, ctr pistons, eagle rods...and now 2 layer head gasket for lowering compression LOL...thanks guys!

Chris

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK_TNR &raquo;</TD></TR><TR><TD CLASS="quote">Is it possible to run the CTR pistons and use a thicker (cometic?) head gasket and get the compression down low enough for a daily driver (tuned or untuned) on 91oct?Modified by EK_TNR at 5:11 PM 9/30/2004</TD></TR></TABLE>

Good luck with that, on 91 octane.

You're going to have pull the cam timing so much that all that gain from higher compression piston will go away...

https://honda-tech.com/zerothread?id=717928

 

get some je pistosn for your cr,i have 14.5:1 in my lsvtec with race gas......

 

SO...according to your link, would I be correct in saying that these (CTR pistons) are NOT ideal for my to be daily driven ls/vtec on 91 w/ stock b16 cams UNTUNED (for a while at least)? I guess I will be putting them up for sale soon and picking up P30 pistons. Is there a recommendation as to what head gasket to run at that point (stock ls ok or is aftermarket needed)? Damn guys, every time I turn around I'm getting a different answer. I guess I need to buy some books and start reading...

Chris

 

A lot of people are misinformed, and so are the online compression calculators that do not factor the actual compression height of the PCT piston itself.

The truth is that static compression ratio of PCT pistons in a B18A/B block (89 mm stroke) will be around 12.8:1 with PR3 head, and around 13.1:1 using P72 head, stock headgasket.

Now if you are building the motor itself and you're going to tune the motor yourself it's your choice.

I would consult this with the tuner and ask him if he feels comfortable tuning such setup, let me just tell you that you won't get away without tunning it out.

Now P30 will give you a lower compression ratio, but more piston to valve clerance (I believe).

Going with those you can try using aftermarket 1layer headgasket for a little compression bump. At the end you will end up somewhere in mid 11 c/r which IN MY OPINION is a perfect street setup.

 

what time of cams would be nice for the p30 pistons...buddy clubs on a b18a1/b16 head setup?

would the setup make close to 200whp?


Modified by ceLtic at 11:52 PM 9/30/2004

 

Head is where you want to spend your money.

I'm sure BuddyClub cams are cool, you should talk to Rocket about his cams.

200whp will be hard to make without a quality header, real engine management.

 

what about using arp rod bolts to put the pistons on factory ls rods?

 

ARP rod bolts, and headstuds.

AEBS headstuts are nice too.

 

mine has lsvtec with ctr pistons on it......yup it pings like hell....i have to go easy on the throttle a lot, also retarded the timing to 15 degrees. ping went away after that. but maybe if you put it in a light car you should be okay.... running it on a type r ecu and i also have a chipped p28