Modified by NO TORQ at 12:56 AM 10/16/2005

 

i dont think the LS crank fits in the GSR, ive tried it, it doesnt work unless you have custom rods.

if you want cheap power, mill the head (ive done up to 0.100, safe is like 0.060), but you have to get cam gears to offset the shorter distance between the cams and the head.

LS rods are weaker, the rod bolts smaller, not as strong, not mad for 8,000rpm, dont do it.

i would
1) mill the head 0.060
2) get ctr pistons
3) get some cams
4) get some springs, retainers
5) chip to rev higher

youll come up about 20 whp or so

 

you are soo wrong...do a little more research and search more and you'll find the answers...there are plenty of threads in the archive about the ls crank in the gsr block...

 

Yes Ls cranks fit in GSR Blocks. But P30 pistons are getting rare. You cant use Ls cranks with P30 pistons in GSR Block, cr will be to high 13:1

GSR CR 9.98:1-----1797 cc
GSR+LS crank CR 11.11:1-----1834 cc
GSR+LS crank+P30 pistons CR 13.05:1-----1834 cc

Just do the GSR block with LS crank, it will be fun.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hawjboi &raquo;</TD></TR><TR><TD CLASS="quote">you are soo wrong...do a little more research and search more and you'll find the answers...there are plenty of threads in the archive about the ls crank in the gsr block...</TD></TR></TABLE>

maybe you misunderstood me

the crank fits yes, but what rods do you use?

ive actually put the LS crankshaft into a gsr block, yes it fits, but the rod lengths are way different
and still i say LS rods are weak, the rod bolts are 8mm as opposed to gsr 9mm and you still cannot rev a ls rod 8000rpm for very long, it will break

why not just get ctr pistons hang it on gsr rods

 

i see, you use gsr rods, cool, ill try it

can you use ctr pistons too?

 

I dont understand this? Why don't you just re-use your GSR crank (if its still ok) and attach P73 USDM ITR pistons to the GSR rods? This will yeild 10.8:1 comp in a USDM b18c1 block and head. If your going turbo, look on ebay, guit-guit sells awsome cast turbo pistons that make 9.7:1 ina usdm b18c1 GSR that are press fit cast and are made specially for turbo. He sells soo manya nd I just put a set in my buddy's b16!

 

im sorry, i just read the thread again. your going turbo? high compression in a turbo car. i wouldnt go more than 9.0-1 in a turbo, not unless you want to do like i did

this was my LSvtec 12.7-1 compression ratio with 120 shot wet nos. held good for a while, then went lean one time...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by del_orson &raquo;</TD></TR><TR><TD CLASS="quote">Yes Ls cranks fit in GSR Blocks. But P30 pistons are getting rare. </TD></TR></TABLE>

p30 pistons are rare?

i have 12 of them in my garage, well, i have 3 b16 short blocks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gold EF &raquo;</TD></TR><TR><TD CLASS="quote">i see, you use gsr rods, cool, ill try it

can you use ctr pistons too?</TD></TR></TABLE>If you use ctr pistons, your cr will be 15:1

 

the theory behind using an ls crank is to extract more torque...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hawjboi &raquo;</TD></TR><TR><TD CLASS="quote">the theory behind using an ls crank is to extract more torque...</TD></TR></TABLE>

your right, but the only way to get more torque is if the rod + piston combo (aftermarket) is taller than the rod + piston combo that is stock. the combo has to be longer to get more torque

the guy is trying to go turbo, so he'd have to get the longest rod+piston, that will fit with that crank, and a recessed piston for low compression.

i tried putting an ls crank in my gsr last night with a ctr piston, it doesnt work, the piston hits the spark plug nasty (i dont know if thats cause my head is milled 0.060)

 

try swapping everything over...that is all the ls internal into the gsr block...if that fits without any piston to valve clearance issues then you'd end up buying aftermarket ls rods and aftermarket ls pistons mounted on the ls crank in the gsr block...

 

not the case my friend got that setr up and currently running it right now ... GSR block ls crank CTR pistons J3 cams making madddd power.. 2500+miles on it... but i dont think his head is milled .060 thousnads?? but i do know for a fact ti does work i help put the motor together. i have the same set up but with JDM ITR pistons and m22x cams .. head is also milled .020 thousands...so far i got like 3k miles on it ...mine needs to be tuned

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by del_orson &raquo;</TD></TR><TR><TD CLASS="quote">If you use ctr pistons, your cr will be 15:1</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silverEG6 &raquo;</TD></TR><TR><TD CLASS="quote">not the case my friend got that setr up and currently running it right now ... GSR block ls crank CTR pistons J3 cams making madddd power.. 2500+miles on it... but i dont think his head is milled .060 thousnads?? but i do know for a fact ti does work i help put the motor together. i have the same set up but with JDM ITR pistons and m22x cams .. head is also milled .020 thousands...so far i got like 3k miles on it ...mine needs to be tuned </TD></TR></TABLE>

so your friend is running 15.3:1 compression ratio? on pump gas?
even 13:1 on pump gas doesnt work...

 

i someone trying to say they are using gsr rods on a ls crank. They cant be i posted this idea a while back and the rod journal widths are off. Gsr uses a narrower rod. Im sure they meant ls rod on ls crank which would work.

 

in all honesty, this threadsucks.

b18b and b18c have the same piston to deck height.

in order to use an ls crank, you have to use ls length rods.

now, in order to use an ls crank in a gsr block, you have to use ls rods or after market ls rods.

the problem is the oil squirters in the gsr block. they will be hit by the longer stroke, therefore they have to be either bented a little bit or pluged up if you are using aftermarket pistons.

**now the thread doesn't suck.

 

i was gettin HEATED as i was reading this then FINALY.. the last post.. ... bout dam time!!

also for newbies.. when your ordering your rods.. let what ever shop know that u are doing this(ls crank) and they will take care of it from there..

alot of people are doing this mod.. get more tq w/ the ls crank.. i say DO IT!

 

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

maybe you misunderstood me

the crank fits yes, but what rods do you use?

ive actually put the LS crankshaft into a gsr block, yes it fits, but the rod lengths are way different
and still i say LS rods are weak, the rod bolts are 8mm as opposed to gsr 9mm and you still cannot rev a ls rod 8000rpm for very long, it will break</TD></TR></TABLE>

I know for a fact the LS rods holdup very well past 8000, the H1 Honda Challange champion (kevin helms) this year ran LS/Vtec with LS rods and has been all season never bending or breaking one. He would rev to 8700 every shift, as long as the motor is tuned right the LS rods holdup very well. and the motor setup he has was putting down 179Whp on a mustang dyno! (around 220-230+ on dynojet)
If you really want to find out the right way to build an ls/vtec talk to Kevin helms @ hondaworks 704-527-9433 and he will make sure it's done right!

 

Bringing this back from the dead...cuz i couldnt find another post about similar (at least not yet, not done searching)

Anyways this is kinda a reverse LS/VTEC correct? And i think that as long as you shot peen the LS rods and use ARP rod bolts everything should be golden.. I believe this is the best way to go LS/VTEC...but since i still havent done it, I guess it doesnt really count

PS LS cranks go for cheap! I found one for 20bux! and this way you skip all of the outside oil lines/kits and oil cooling and other junk.

Plus you still get to keep your squirters by bending them

TORQUE is a good thing

Now we just have to establish what pistons would give a good streetable commpresion ratio? Anyone? RS CAST PISTONS? HMMM