teefunk01

which one is better to use? recommended? thanks

nevin

im sorry but ls block measures the same as a gsr block so with a gsr crank it essentially makes it just a gsr turbo... so your question is whats better gsr turbo or gsr turbo? Comes down to presonal preference but I will add that the fastest street honda runs a ls crank.

mike1114

iTrader: (1)

I'm no engine genius but I believe the LS crank is better.

I;ve seen dyno plots of my motor with the GSR crank and LS crank and noticed that peak tq came on a lot quicker than the GSR where it took until like 6K then TQ just jumped way up.

The LS crank tq curve was more linear.

I think it has to do with rod/stroke ratios?

dome

iTrader: (1)

do a search on this. there is some much on this topic. go with the ls crank though.

JLHDOHC

I think it coms down to what your doing with it, drag racing, ext. I have a Sleeved 84mm Gsr block and it was very responsive it quickly hit boost and I was running only 10psi it ran great and wasent even tuned for full boost. I drag race it in my 94 civic coupe and it quick..

jdmvtec28

The 2 cranks can be looked as a trade off, with the LS crank you would get more tq out of your setup but sacrifice the high rpm stability that the rod ratio of a GSR crank would give you. With the GSR crank you motor might rev more readily but also lack the low end grunt the LS crank would provide. So you decide what your objectives are.

Just to add my .02, I Would run a GSR block and a LS crank, using the GSR block you would have the added benefits of oils squirters and crank girdle with the excellent tq characteristics of a LS crank.

riceball777

ls crank
the ls crank will make more power and tq through out the whole power band. the lower rod stroke ratio is so small its not Significant . nothing forged rods cant take.

rorik

It's really a Very small difference, 1797cc with a rod/stroke of 1.58 for the gsr, vs the ls 1834cc with a r/s of 1.54. I chose the 1.58 r/s over the 37cc's and put a gsr crank in my ls. I figure I would rather have a better rod/ stroke ratio with boost than 37 extra cc's.

turboEGhatch

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rorik &raquo;</TD></TR><TR><TD CLASS="quote">It's really a Very small difference, 1797cc with a rod/stroke of 1.58 for the gsr, vs the ls 1834cc with a r/s of 1.54. I chose the 1.58 r/s over the 37cc's and put a gsr crank in my ls. I figure I would rather have a better rod/ stroke ratio with boost than 37 extra cc's. </TD></TR></TABLE>

Thank you for the first mostly worthy response. It's not like we're talking about a 100mm stroker crank vs. a 77mm B16 crank. This is 89mm vs. 87.2mm. Tiny difference, it's not going to make any difference in how the motor revs, barely any difference in how torque comes in, and a 1.54 vs. 1.58 rod/stroke ratio means dick all. Rod/stroke ratio means dick all most of the time anyways.

rorik

yeah, it's kind of an interesting question to figure out which one puts more stress on the motor..longer stroke=more torque for a given cyl press, but the worse rod/stroke ratio produces more piston side loading and an increased rate of acceleration on the rod/piston..

In my opinion, the b16 is the only honda short block that was designed correctly, 1.74:1 r/s, and the b17 is the best compromise, but those 2 engines are just to small for what I want..

JDM4mee

Actualy, you cannot run the engine with the oil squirters on, since the actual crak will hit them. You must purchase a set of oil squirters plugs. The LS rods come with their own way of lubricating the cylinder walls/cooling the piston down...
The most important part would be the reinforce connecting rod bolts, if you do not change them sonner or later you will suffer a catastrophic rod failur.

Anyways, I recommend going with the LS Crank...
you can find alot more about this subjet..

SD_Lurker

iTrader: (4)

hmm 5 years later? I'm sure he's been patiently waiting a response as such.. Better late then never, right?