i have decided to build a new motor for my civic i picked up a ls block along with eagle rods i was going to go with wiesco pistons but feel that they are to much money and a little overkill for my goals i would like to make anywhere between 200-220 whp i was going with something like 12.5:1 comp ratio on the pistons would there be a better choise for pistons with the eagle rods or sould i use the stock ls rods with oem type r or b16 pistons i have a gsr head with type r headers and cams n springs along with aem fuel rail n reg and skunk2 pro intake mani and type r tb i know that having a gsr head makes the comp ratio increase due to there small combustion chambers

 

have you looked into the ctr pistons with the over sized bore? they should give you the compression numbers you'd like.

 

i was thinking either that or jdm integra type r p73

 

if you want 12.5 you have to go with CTR's or P30 pistons the JDM type R will not get you up to 12.5:1

 

correct. the CTRs will be better if you want higher compression. all the people i have known to do N/A builds usually go with CTRs over ITRs. you should also research more on it and see if that's what you'll like also. and post pics when you get some. lol.

 

i went with USDM type R for my ls-vtec because i am thinking about a super charger...if not i would of gone for the CTR they are beasty

 

so you're going SC??? if so, then i suppose the itr pistons will be a good fit for it. but make sure you dont get cheap ebay ITR pistons, i've heard some of them aren't reliable. just a heads up.

 

oh no way i went with the Honda piston

 

oh. lol. ok. that'll work great then. lol. i must have misunderstood. so you're for sure going with the usdm ITRs. cool. now get em and start your build thread. lol.

 

Depending on what level of boost you plan on throwing at it...

You MAY want to look into some forged pistons.

I like how you asked for (pros only please) and haven't had ONE post on this thread....

 

well i already have it in my del sol now i love it!

 

no boost just n/a maybe some nitrous down the line but rite now i have eagle rods and was thinking of wieco pistons but wanted to see if there way a cheaper way to reach 12.5:1 comp ratio range with oem pistons with the ls rods i was also worried about relaiabily issues

lol its true not one pro have help yet

 

That's because this isn't exactly a "pro" build and the part combination, build plan, compression goal and possible future use is somewhat poorly thought out and unrealistic. A pro would have learned a long time ago to not even bother trying to involve themselves in a thread like this.

 

OP, I'm going to try to give you some advice.

(1) search the dyno thread at the top of the forum and look for a combination the produces the power you are looking for.

(2) PCT (CTR) piston and a GSR head are not a great combination. It is possible with those pistons to make contact with the quench pads on the head.

(3) 12 and above compression on pump gas is not that effective for making power. Go with 11:5:1 and turn the timing up. This has been proven over and over and over to be effective for making very good power on pump gas and this combo typically does not have problems with piston to head contact. I used this combo.

(4) Your best bet for making exceptional power are going to had by using a tuned intake (best length found on the dyno), good intake manifold (port matched), cams that match the build, correctly gap plugs (found on the dyno), a good header (one that matches your build) and a free flowing exhaust (2.5" or >).

(5) Competent assembly of the bottom end. The difference between a "pro" build and a amateur build is about 8 whp on a 1.8L.

(6) A good valve good will yield 7 or 8 whp without any sort of porting. CC has demonstrated this over and over and over.

If you search through the threads you will find what I'm saying is true.

GL on your build.

 

OP listen to him, he knows what he's talking about. And dont jump on that CTR+GSR bandwagon mearly because you see people posting about it here everyday, not saying it cant be done but first research!

 

i must thank you for your very informative responce i have decided to go with the wiesco pistons that will put me in the 11.5-11.8:1 comp ratio range they will be mounted on eagle rods the block is being bored to 81.5mm and the head is getting port matched to the skunk 2 intake mani i have i will also be using a hondata intake gasket i am using a set of jdm type r headers for now untill i can afford something better i have a full 2.5 exhaust back to a vibrant muffler no cats the motor is being built by a buddie of mine that owns a tuning shop an builds honda motors

ps. just one more question when you say turn the timing up you mean advance the timing correct i was told to make sure i get adj cam gears as ls/vtec timing will always be slightly off

 

Good deal, your set-up has potential.

What I mean is advance your ignition timing via your ecu ignition tables.

Yes, timing gears will help in setting base timing.

 

thanks the tuner is one of the best in ny he tunes some of the fastest all motor hondas

how much you think i can get out of this setup

 

Sounds like a good foundation. Warms my heart to see that you're ACTUALLY LISTENING to people and not trying to go with a CR > 12:1.

IF you're planning on SCing it, later....I wouldn't go with a CR > 11:1 or so and use forged pistsons. This being mostly due to the heat issues a SC can have.

You're going to want a nicer header. I'd see about selling it and going w/ something like VTECKidd's Narrow-Style header.

Next thing you know, you'll be calling Combustion Contraption for some headwork! I've heard he does really good work, and his pricing is quite fair.

G/L with the build!