What combo to make 12:0:1 in an Ls

[1badgvr4]

Using honda parts.

[slostang]

you can around 11.5:1 with b16's. CTR's are right at 12.25:1 IIRC.

[1badgvr4]

you can around 11.5:1 with b16's. CTR's are right at 12.25:1 IIRC. Find out for sure and get back to me. Comp calulator says ls crank with gsr rods and pr3 pistons = 12:6:1. I don't like the gsr rods in a ls block thing tho.

[slostang]

CTR's are a little over 12.8:1 im checking on the b16's...

[slostang]

yeah its about 11.5:1 with b16's.

[1badgvr4]

yeah its about 11.5:1 with b16's. I wanna build an ls with at least 12.0. 12:5 is max. Time to make the 4 door move out.

[DarKStaR]

81.5mm ls with PR3's and a 1 layer headgasket will yield 12.04:1

[allmotorX]

if your going with stock bore get b16 pistons 1layer hg and mill the head .010 that will put you around 12.2:1

[Black4DrEK]

Yea and i Have some 81.5 PR3 (b16) pistons in the FOR SALE thread!

[1badgvr4]

81.5 would be 0.20 overbore right?

[allmotorX]

^^yea

[y-49]

my fav. dsmer going behind my back i see. lol. i quess u are ready for some reliable power.

[schia89]

my fav. dsmer going behind my back i see. lol. i quess u are ready for some reliable power. Whatever is slow will be reliable. This is why hondas never break down lol.

[DarKStaR]

Whatever is slow will be reliable. This is why hondas never break down lol.

Failed to see the humor :thinking:

[SPOOLIN]

Find out for sure and get back to me. Comp calulator says ls crank with gsr rods and pr3 pistons = 12:6:1. I don't like the gsr rods in a ls block thing tho.


cant put ls crank with gsr rods anyways.

[1badgvr4]

Failed to see the humor :thinking: Calm down man this is an on going thing between me and him. DSM vs Honda. Forgot to sign on my username.

[1badgvr4]

cant put ls crank with gsr rods anyways.Which I found out. Im a honda newb.

[99jdmLs]

just get the jdm b16b pistons, PCT....they will give you a 13.1 compression with a 3 layer headgasket.......:D

[junior_tm]

just wondering what is PCT???

[1badgvr4]

just get the jdm b16b pistons, PCT....they will give you a 13.1 compression with a 3 layer headgasket.......:D I've been hearing those are not very good pistons to use. Something about being prone to detonation.

[Black4DrEK]

PCT= civic type R pistons


13.1 is fucking NUTS!!

[1badgvr4]

PCT= civic type R pistons


13.1 is fucking NUTS!! If he is right then im down. Hell someone needs to try it :ninja:

[junior_tm]

PCT= civic type R pistons


13.1 is fucking NUTS!!


thanks :goodjob:

[99jdmLs]

there were some .25 over pct pistons being sold in the for sale thread few days ago, came with OEM rings to. 175 bucks.... BNIB (a deal)

you can buy them for 169 shipped off some sites and oem rings are around 120...

http://www.zealautowerks.com/bseries.html
this is the calculator that i used, change it between p30 and the pct pistons. it goes from 11.6 to 13.1 perdy nasty!


3 different types of b16 pistons:
(all calculations are b18/b20 with a oem 3 layer head gasket)
p3-usdm b16 11.39:1 comp
p30-jdm b16a 11.61:1 comp
pct-jdm b16b 13.14:1 comp


if you want to go ls/vtec with a gsr head kiss pump gas goodbye- 14.31:1:tongue1:

[Black4DrEK]

yea whatever you do my friend CHOOSE wisely!!

[1badgvr4]

13.1 sounds about right. The goal is to beat lsv's. Ill update the thread when I get off my ass and do something.

[allmotoronly]

http://www.importatlanta.com/forums/showthread.php?t=162463

that should answer all your questions

[1badgvr4]

Thats all with a vtec head.

[allmotoronly]

there were some .25 over pct pistons being sold in the for sale thread few days ago, came with OEM rings to. 175 bucks.... BNIB (a deal)

you can buy them for 169 shipped off some sites and oem rings are around 120...

http://www.zealautowerks.com/bseries.html
this is the calculator that i used, change it between p30 and the pct pistons. it goes from 11.6 to 13.1 perdy nasty!


3 different types of b16 pistons:
(all calculations are b18/b20 with a oem 3 layer head gasket)
p3-usdm b16 11.39:1 comp
p30-jdm b16a 11.61:1 comp
pct-jdm b16b 13.14:1 comp


if you want to go ls/vtec with a gsr head kiss pump gas goodbye- 14.31:1:tongue1:

I don't know where you are getting those numbers. By my calculations, using PCT pistons in an otherwise stock B18A/B will net you around 11.55:1.

PR3- 10.92:1
P30- 11.16:1

There's no way it's making 13:1 using a LS head. Those heads have larger combustion chambers than VTEC heads. Larger combustion chamber = lower compression ratio. Maybe you didn't use the correct piston to deck height.

Even with a B18C5 block/head and PCT pistons you are only right at 12.0:1 using a stock head gasket.

1badgvr4, are you going to be using stock sized or 0.25mm oversized pistons?

stock sized PCT pistons are good for 11.55:1.

0.25 over PCT pistons are good for 11.61:1.

The only way I know of to get 13.0:1 using stock honda parts is using a B18A/B block, GSR head, .25 over PCT pistons, and a single layer head gasket, which is good for around 13.1:1.

Most of those online calculators do not take into account the piston to deck height, and differences between head gasket types. Also, most give the wrong thickness for oem honda head gaskets.

[yunglaosta]

all motor ls? theres a vid on youtube, and a thread on honda-tech

[NEMO]

13.1 sounds about right. The goal is to beat lsv's. Ill update the thread when I get off my ass and do something.damn you trying to come for me.:lmfao: :cheers:

but why not just go LSV?

[DAslowman]

:crazy:

[Samhonda95]

i love tha pct pistons!!!!!!!!


i've built 3 motors with them. 1 ls/vtec 1 b16 and 1 all ls and they run great!
tha b16 with ctr cams itr intake manni and itr tb went 8.50's in the 1/8th miles with a half ass street tune:goodjob:

just be sure to upgrade ur rod bolts with arp bolts.

[yunglaosta]

Brian Crower 403 Cam's, P30 (because they fit on the stock ls rods without any mods), LS ARP Rod Bolts (to rev higher than 7k RPM), Port and Polish the head, new Valvespring, Retainers, Valves, Intake Manifold, Short Ram or Cold Air Intake, and a good tune

[trista]

If he is right then im down. Hell someone needs to try it :ninja:


i have it. :gay:

[FasTech]

i have it. :gay:


You mean, PT has it. :D

[southside]

PCT= civic type R pistons


13.1 is fucking NUTS!!:ninja: You just dont know how nuts it really is.:D ;)

[1badgvr4]

damn you trying to come for me.:lmfao: :cheers:

but why not just go LSV?Not really. How about to come get some of the other car:cheers:

[VickNotic]

PCT= b16b ctr pistons

[MugenCrx]

dean u need to check the pct height im sure that they will hit the ls head and im sure that the rods gotta be trimmed to fit the pct anyways so i say b16's in a ls shot peen the rods and be happy with the 11.... compression p30's are cheap anyways

[MugenCrx]

if not that then get some forged pistons more reliable

[1badgvr4]

dean u need to check the pct height im sure that they will hit the ls head and im sure that the rods gotta be trimmed to fit the pct anyways so i say b16's in a ls shot peen the rods and be happy with the 11.... compression p30's are cheap anywaysI know I already own some. So many choices. Turbo D or ls or sell it and get something elso.

[MugenCrx]

sell the d fix the b ;)

[southside]

I've been hearing those are not very good pistons to use. Something about being prone to detonation.:thinking: Who still runs pump gas anyways lol.Should be ok on 93 as long as you get tuned shouldnt have to worry about detonation.

[southside]

dean u need to check the pct height im sure that they will hit the ls head and im sure that the rods gotta be trimmed to fit the pct anyways so i say b16's in a ls shot peen the rods and be happy with the 11.... compression p30's are cheap anywayswrong you are pcts will work in a ls and not touch the head and they dont have to be trimmed at all. B16 and ls rods are similar when it comes to wristpins.Gsr pistons and type R require some modification to fit ls rods.:2cents:

[smote]

you will spend more money than it is worth to "outrun ls-vtecs" and when you do finally find one you can beat, he will just be a set of $300 ITR cams from outrunning you.
that being said, if you are stuck on running non-vtec you should find a P8R head, they have the same size valves as a vtec head and SIMILAR flow characteristics. Then a forged rotating assembly, big ass cams (405's?) and a good header (those kidd headers look pretty good) an Intake mani/ TB and get the head/IM ported together. Should be fun little motor.

[stretch]

If he is right then im down. Hell someone needs to try it :ninja:


I tried it a couple years back... they are proned to detonation,and it didn't help none for me to use a shaved gsr head....was real powerful too but I had to use 93 octane plus a bottle of octane boost on every fill up for it to stop pinging. And I got it tuned. But that bitch was badass though I must say that