LS crank in GSR

[Slava]

I had a thread on this before but now I can't find it.

So by adding a LS crank to a stock GSR block it will increase the displacement. Here is what I found on Honda-Tech:
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

By increasing the displacement and compression you are deffinatly increasing HP and TQ but how abour reliability at 8,200+ RPM?

LS vtec motors can't rev that high. Some people say because of the LS rods, others say because of the crank.

So what do you think?

All opinions are welcomed.

[servion]

The LS motor can't rev high cor a handful of reasons... to name a few:
1) rods (rodbolts)
2) the heads use a "floating" rocker setup
3) stock LS heads aren't optimized for high RPM power

The difference between revving a GSR crank high and an LS crank high is very minimal. I revved mine to 9.6k the last couple years without a problem and I anticipate at least 10k this year.

[fantasya98]

The LS motor can't rev high cor a handful of reasons... to name a few:
1) rods (rodbolts)
2) the heads use a "floating" rocker setup
3) stock LS heads aren't optimized for high RPM power

The difference between revving a GSR crank high and an LS crank high is very minimal. I revved mine to 9.6k the last couple years without a problem and I anticipate at least 10k this year.

with all the members on here, servion is someone ill def. take advice from; even though ive nvr met him. :cheers:

[servion]

with all the members on here, servion is someone ill def. take advice from; even though ive nvr met him. :cheers:

Thanks :)

[HONDA GHANDI]

Basically you will be getting a longer stroke with the LS crank (1.8mm) which increases your piston speed slightly as well as displacement. CR will be determined mostly by the pistons you decide to use and the head you use. The RS ratio is not so bad that you cant rev it either, should make a decent setup with a good cylinder head package. The stock rods will be suspect at high revs as well as LS cylinder head design. But the crank wont be an issue especially if you are looking at N/A power.

[rmcdaniels]

ARP makes rod bolts, main cap studs, and head studs for it,

[Slava]

with all the members on here, servion is someone ill def. take advice from; even though ive nvr met him. :cheers:


I know Servion personally and definatly will take his word and seeing some of his work in person I know his word counts.

[B20badboy]

Werent you running an LS crank Jeremy?

[servion]

yep :) Still am.

[B20badboy]

What are the advantages again?

[servion]

Basically more torque (and therefore horsepower) throughout the powerband.

[oldskoolracer]

does this mean if you wanted to you could just tear up a good ls and throw it all into a gsr block?


waste of money, but had to ask for the hell of it

[boosted_b16]

the only thing you need to change to rev it to 8,200 rpm is a set of arp rod bolts, because you need to use the LS crank AND rods, and the LS rod bolts are weak, a set of arp head bolts would be good to use as well, gs-r motor with LS rods and crank and p30 pistons is just like an LS/vtec w/ p30 pistons.