X2BOARD

Simple, stupid question....

Would using an ITR or CTR piston on an LS engine (no major mods) result in any type of significant power or torque increase ? I know it will increase my compression and I do plan to go LS/Vtec, but not very soon and I have no plans to go FI or NOS...

WAFFLES

Higher comp. is more power. But, go ITR, CTR will be too high

Gong Show

same question i had but in jdm gsr motor... i was thinking between jdm ctr piston/cams or jdm itr pistons/ctr cams in my gsr. or change the head out to a b16 and run the ctr set-up??? if i ran the gsr with the ctr set-up will i run into clearance problems and how high will the compression be???

fowler!

I believe that if you run CTR pistons on a B18C non-R/B18C1, you would have around a 12.5:1 compression ratio. Also, you wouldn't have any clearance issues.

rioninja

I know this has been answered before, but what are average compression numbers for ctr slugs in an ls/vtec with b16 head compared to the itr ones?

WAFFLES

Rio- That yields about 11.8:1-12:1

3.3.3

waffles....sig=???? you are confused arent ya?

rioninja

waffles... thanks for the info

91sifreak

What about ctr pistons in a b16a with the whole valvetrain and cams done up for high compression? Anyone every use the Mugen head gasket?

WAFFLES

Maybe I'm not understanding you, but what exactly are you asking? the compression ratio? Let us know so you can get an answer.

91sifreak

Well I am building up the valvetrain and wanted to know if I put the ctr pistons in will it be a reliable setup, and what is the compression. I have the cams on the way and the valves and valve springs are already here just waiting to the cams questions to be answered, but should I use the ITR or the CTR pistons with my setup?

WAFFLES

Go CTR. It will be reliable. 11.1:1 or so.

Blue-Civic-Hybrid

iTrader: (1)

So would CTR pistons in a B18C1 block be acceptable as a daily driver? I plan on upgrading my cams very soon(CTR intake, ITR exhaust) and was wondering if i should also upgrade my valve train as well since i plan on running higher compression in a few months time. I was wondering if this would be beneficial to the new slugs i put in, like using ITR springs, aftermarket valves(skunk2 or stock ITR?) and ITR LMA's, would my compression be too high for 92 octane pump gas? if anyone has done this already, let me know how it runs..and i'm guessing i will not pass smog if i do this?

Gong Show

same question i had... you really dont need the itr lma. and i also hear that the new skunk2
valves raise up compression as well, i dont know by how many points... and if you have the money and the head off
upgrading your train would be good(imo), plus if you plan on chipping your ecu then you will need to get the new train...
and im still trying to find the exact comp. and will pump gas be healthy enough for this set-up...

WAFFLES

Upgrading the valvetrain is always a good idea. ITR stuff will be good, but if you chip your ecu, and you plan on revving VERY high, get something stiffer(TODA, MUGEN,ETC.) And yes 92-93 octane gas will be alright for 11-11.5:1 comp.

91sifreak

Has you guys replaced the head head gasket with themugen one?

Red Civic T

A little late , but Tom Fujita of http://www.portflow.com says the CR with CTR's in a JDMb16a should be about 10.89. If P&P with compression chamber cleanup on head, you will LOSE even more compression. I had mine milled by him 30 thousandths to bring it back up to about 11.15.......

Blue-Civic-Hybrid

iTrader: (1)

I wasn't planning on revving very high, maybe between 8500 to 9000 tops, but then i would need the ITR LMA's for the lumpier cam correct? I have also heard that the ITR LMA's are lighter than my GSR's to allow them to move quicker. and if i do this, what kind of ECU program would i need? would a stock ITR ECU be sufficient? thanks for replies..maybe i should just buy a ITR head and start from there....oh well, just trying to save some cash and not go FI....


[Modified by Blue-Civic-Hybrid, 6:24 AM 8/9/2001]

3.3.3

unless you have your top end reinforced, i wouldnt go ctr for daily driving in a stock block.

Red Civic T

I am not understanding some of the commentary - a raise in compression alone would not mean HAVING TO upgrade valvetrain (or the bottom end for that matter).

You should have ITR springs, retainers & check on the keepers in any case, and prob ITR/CTR cams way to go.As was said above, streetable compression should be less than 11.5. All those people saying they run 12.5, etc. are not running a reliable combo on pump gas and for every day reliability.

Reasonable would be the valvetrain changes stated, poss. head work - and I recommend Tom Fujita highly - STOCK bottom end, compression with piston combo @ 11.0-11.5, and ECU upgrade - would check with http://www.locashracing.com

Blue-Civic-Hybrid

iTrader: (1)

thanks Red, I should be putting in my CTR and ITR cams in by next week, hope for the best!! I'm just sticking to the cams for now...no revving past 8300....