do i need to get good pistons like itr pistons or can i stay with stock pistons..would it be safe to stay with stock ones?

 

stock ls pistons will work but itr or ctr pistons will give u more compression so u will be abe to get more power out of it. and if u get a set of pistons for it get them oversized nothing bigger than 82mm though every ls motor i have taken apart has egged cylinders and needed to be bored.

 

ITR or CTR pistons are fine, make sure you get the block bored and honed...

 

do your homework on Ls/Vtec... it's a non noob motor...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ernald711 &raquo;</TD></TR><TR><TD CLASS="quote">do your homework on Ls/Vtec... it's a non noob motor... </TD></TR></TABLE>

agreed search like every friggin thread...this has to be about the 3rd ive posted in w/in the last 2 days

 

ya what they said do a search on it just read everything u come across your gunna hear things about rod to stroke ratios headgaskets oil line blah blah. i recomend the eagle ls/vtec kit it comes with the head gasket, oil line, oil sandwich plate, dowel pins, and u will need to get either gsr headbolts or some arp gsr head studs and u use a stock LS timing belt as well anyways good luck!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattcivic &raquo;</TD></TR><TR><TD CLASS="quote">and u use a stock LS timing belt as well anyways good luck!!</TD></TR></TABLE>

um sorry to negate you...youll want to upgarde to a vtec water pump & oil pumps also if you care about your motor...and youll also need vtec timing belt []

 

ouch ya i forgot i was poor when i built mine re-used ls water pump and re-used vtec oil pump haha i was broke

 

thanks alot homies

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumking15 &raquo;</TD></TR><TR><TD CLASS="quote">

um sorry to negate you...youll want to upgarde to a vtec water pump & oil pumps also if you care about your motor...and youll also need vtec timing belt []</TD></TR></TABLE>

depending on what engine year you have...the later years have the same oilpump and water pump

 

CTR pistons would be my choice...compression numbers

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALMXDUPINTEGRA &raquo;</TD></TR><TR><TD CLASS="quote">depending on what engine year you have...the later years have the same oilpump and water pump</TD></TR></TABLE>

basic honda knowledge will tell you this isnt true...vtec belts are different than ls's...and every vtec/non-vtec water pump is different...yes later model years 97+ have the same oil pumps...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALMXDUPINTEGRA &raquo;</TD></TR><TR><TD CLASS="quote">CTR pistons would be my choice...compression numbers</TD></TR></TABLE>
CTR pistons would be better with upgraded cams. let's not go too crazy on static compression ratio, now. you'll more than likely need either need great tuning or bigger cams if you choose CTR pistons.

 

w/ higer cr comes the need for bigger cams...but not to big...you want to have harmony in the engine...not huge cams w/ no cr...or vise versa....its about buildin a engine the works togeteher....

 

A good lsvtec requires a good mechanic,good parts,and a good amount of money.I would search the boards for as much info as you can get,then consult your mechanic on whether or not he has any experience with the build and what he'd reccomend.good luck.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2uy &raquo;</TD></TR><TR><TD CLASS="quote">do i need to get good pistons like itr pistons or can i stay with stock pistons..would it be safe to stay with stock ones?</TD></TR></TABLE>

with stock pistons your compression will be lower...got to JDM ITR's or the JDM SiR pistons (P30 I think)...watch piston to valve clearances though...do your research man...it will help...

 

what you guys have to remember is that there actually are physics that explain compression ratios. it's not just "oh, this cam is a little too big for that piston." it's just a matter of getting a dynamic compression ratio that you [or somebody you know or somebody who you pay to know] can tune. some tuners can't tune as well as others. you'll learn that sometime if you continue seeking performance, and it will cost you big time one day. try to make that day as far away as possible and stick with a safe bet (i.e. not CTR pistons, more like JDM ITR) and get a good tuner.

 

agree'd not every tuner is going to be able to tune a high-cr car...its pushing the limits of detonation as is...but w/ correct ignition curves it will make the most power...but dont get me wrong you wont see a 40whp gain in a .5cr difference....youll find much more power to be had if your parts all work togeteher...

 

you will be fine with the stock LS pistons...but the short block is only designed to spin to 7krpm...so if you would like to take your engine to a higher rpm...id get some ARP rod bolts for some added insurance

 

research man, itr pistons is what id use. also arp rod bolts

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurBoTeG &raquo;</TD></TR><TR><TD CLASS="quote">you will be fine with the stock LS pistons...but the short block is only designed to spin to 7krpm...so if you would like to take your engine to a higher rpm...id get some ARP rod bolts for some added insurance</TD></TR></TABLE>
i hope what you mean is "yes, it will be SAFE to stick with stock pistons," as originally asked.

now, keep in mind, if you stay with stock pistons, you will probably see very minute gains on the dyno. with some tuning you'll see decent gains from LS/VTEC, but probably not enough to warrant the cost of LS/VTEC. the only way you'll see real worthwhile gains is with a big bump in c/r. otherwise just get your bolt-ons LS tuned.

 

ls slugsin a ls/vtec is pointless imho...you might as well not even do the ls/vtec conversion...and agreeing w/ ^ youd be better off building up you ls and prob would make more power w/ bolts ons for the same amount of $ as the conversion....cr makes all the difference in the world when combined w/ a good flowin intake and exh w/ some lumpy cams

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumking15 &raquo;</TD></TR><TR><TD CLASS="quote">ls slugsin a ls/vtec is pointless imho...you might as well not even do the ls/vtec conversion</TD></TR></TABLE>

OK, this thread and talk of CRvsVTEC makes me wonder why not just swap the pistons. I've seen a few nonVTEC engines built with the reasoning that the main thing the VTEC does is make powerband broader. I mean, it's not like the factory VTEC motors gained a lot of hp vs nonVTEC from same year/car. The only thing I can think of is that with the VTEC you might be able to get away with more CR, but you can also do that with cam overlap...

Mike
More exp w/ 8's than 4's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95lstegman &raquo;</TD></TR><TR><TD CLASS="quote">
i hope what you mean is "yes, it will be SAFE to stick with stock pistons," as originally asked.

now, keep in mind, if you stay with stock pistons, you will probably see very minute gains on the dyno. with some tuning you'll see decent gains from LS/VTEC, but probably not enough to warrant the cost of LS/VTEC. the only way you'll see real worthwhile gains is with a big bump in c/r. otherwise just get your bolt-ons LS tuned.</TD></TR></TABLE>

So from a professional stand point, you dont think my 92 da9 b18a1 is worth the conversion in your opinion? You think my LS motor should just get tuning and modded out or what? Even though There is 150k mls. on the motor/chasis? Tell me man, I need to learn.......I've been researching so friggin much its makin my head hurt. Come on Tranny King!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DA9GUY-637 &raquo;</TD></TR><TR><TD CLASS="quote">So from a professional stand point, you dont think my 92 da9 b18a1 is worth the conversion in your opinion? You think my LS motor should just get tuning and modded out or what? Even though There is 150k mls. on the motor/chasis? Tell me man, I need to learn.......I've been researching so friggin much its makin my head hurt. Come on Tranny King!! </TD></TR></TABLE>
really? with 150k miles on that motor, converting it to LS/VTEC would cost at least as much as a non-VTEC build. with 150k miles, revving over stock redline (read: VTEC) will basically make your motor a time bomb with no display to tell you when it's going to explode. the only way to remedy this would be to rebuild the block. as long as you're doing that, why not make a real LS? 8000rpm with VTEC isn't so different from without VTEC. the [most basic] advantages the GSR has over the LS are:
better flowing head
bigger cams with smaller cams for low-end "power"
higher c/r, which is more or less negated by the larger cams.
dual-plane intake manifold

of those, the better flowing head kills all low end power, regardless of smaller cam profile outside of VTEC operation, the higher c/r doesn't matter because you need a rebuild anyways, and the dual-plane intake manifold is generally ditched in favor of performance. so here i propose rebuild your LS with ITR pistons and ARP rod bolts, new OEM bearings, VTEC oil and water pumps just like you would for LS/VTEC. only instead, have your LS head rebuilt too with valvetrain and big lumpy cams, and only have the head very lightly worked over, like just smooth out any casting marks, cleanup around the bowls, no real porting. you'll get hella low end, trust me, and even with the stock head casting it will easily pull to 8000rpm. i have a stock head casting in my LS with crower stage 3's and the torque doesn't even begin to fall off until 6000rpm; porting would be wasted on a motor only going to 8000rpm. then you'll have modded GSR power in the 160-170whp range, you'll have hella low end famous LS torque, and you won't have spent any more money than LS/VTEC. and you'll be unique, if that matters.