hey i had a few questions about b series crankshafts. First, can a gsr crank be put into an ls block. Also i heard that a stock b18 crank is good for around 400 hp is that true? please help. Thanks

 

gsr crank into ls block, yes, but why? stock honda cranks are very strong, they'll hold way more than 400hp. i'd trust the stock one to any aftermarket forged piece any day of the week.

 

people are making 600+whp with stock crankshafts.
check the force induction

 

I thought that the ls crank shaft was stronger than the GSR...? Not really sure though!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98IntegraGSRguy &raquo;</TD></TR><TR><TD CLASS="quote">I thought that the ls crank shaft was stronger than the GSR...? Not really sure though!</TD></TR></TABLE>

ls - 89mm
gsr/itr - 87.2mm

 

If you put a GS-R crank into an LS block and keep everything else the same (stock LS pistons, head, etc.) you will have lower compression (9:1 instead of stock 9.2:1) and lose 37 cc of displacement.

 

Has anyone ever put a GSR crank into an LS block??? I have a shot GSR block, a fine bare LS block, and a very low budget... The only road to take right now is putting my GSR crank and rods into the LS case... Would it be safe to still use the GSR head bolts and rod bolts???

 

its not as simple as that. it wouldnt work at all cause the piston to deck is too big of a gap. and it would actually be stock LS , 9.6:1 , to little over 8.7:1. but like i said , it wouldnt run properly , if at all. and the stock cranks in all these engines can handle prolly 1000 horse. well maybe not all , lol.

 

I am wondering the same thing.. Will the gsr crank run better than the ls? LS crank you get more torque.. but gsr you get better R/S and on a turbo set up you want it to rev high so would you guys prefer the gsr? Is there a estimate compression ratio with a gsr crank in a 85mm LS block that has been decked .04?

 

So will the GSR crank work inside an LS block or not??? W/ the use of the P72 rods and pistons of course... Maybe even B16 pistons since it's all coming out anyways... In need of more input...

 

im in the Process of building a turbo motor.
84mm gsr block but i was thinking about using the ls crank.
what do you guys use

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cranny &raquo;</TD></TR><TR><TD CLASS="quote">its not as simple as that. it wouldnt work at all cause the piston to deck is too big of a gap. and it would actually be stock LS , 9.6:1 , to little over 8.7:1. but like i said , it wouldnt run properly , if at all. and the stock cranks in all these engines can handle prolly 1000 horse. well maybe not all , lol.</TD></TR></TABLE>

Stock LS is 9.2 : 1 according to C-speed Racing's calculator.

 

I am building a motor for boost and i need help to see if this set up will work good
i have an ls vtec with a bare ls block.
for the internals i want to use:
GSR crankshaft
darton 81 mm sleeves
eagle h beam rods
forged pistons(not sure what kinds are good and what compression i need)
i have 440 injectors and i plan to run them pretty much as high *** they go, so i need help to see what kind of compression i am looking for im guessing i will be running about 15 lbs of boost. also i need to know if the gsr crank will be alright to use, and what kind and what compression pistons to use.
Please help thanks!

 

basically , milling the LS block to the deck height needed to run a GSR crank , is the same as just running a GSR block you know what i mean. imo its not worth it. for the average street guy , theres no benefit. either of the 2 cranks , can take the same abuse really. im prett sure a stock LS is 9.6:1 CR. maybe someone else can verify or correct. not all the compression calculators are correct. just build your LSVTEC with the LS bottom end dude. get the crank balanced , if your building for boost , your gonna be running H rods anyways(if your smart). your gonna need bigger injectors ganja , that i can tell you for sure. you wanna run 15 lbs , your gonna need at least 750's. running a fuel injector at 100% , even though there is enough fuel , is not near as efficient or easy for whos doing your tuning , as running bigger injectors at less duty cycle , with same amount of fuel. 450 cc injectors only efficient till about 275 whp. others here are smarter with the tuning stuff , im still learning.

 

you guys dont need to mill this and that at all actually.

the gsr block and the ls block has the same piston to deck height.

on top of that, remember that if you use the ls crack, you have to use the ls rods. vice versa(gsr crack, gsr rods)

with that in mind, there is not point in transfering your gsr crank into your ls block. reason being is that when you are doing that, you lose the block girdle, oil jets, oil cooler(94-95 gsr model blocks), and you have to pay for the machine work to transfer things from one to another.

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now on the other hand, if you have an ls crank and want to put that into your gsr block... than performance gains can be seen here. just search .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsrious &raquo;</TD></TR><TR><TD CLASS="quote">you guys dont need to mill this and that at all actually.
the gsr block and the ls block has the same piston to deck height.
on top of that, remember that if you use the ls crack, you have to use the ls rods. vice versa(gsr crack, gsr rods)
with that in mind, there is not point in transfering your gsr crank into your ls block. reason being is that when you are doing that, you lose the block girdle, oil jets, oil cooler(94-95 gsr model blocks), and you have to pay for the machine work to transfer things from one to another.
now on the other hand, if you have an ls crank and want to put that into your gsr block... than performance gains can be seen here. just search .</TD></TR></TABLE>

i dont think so. i think the piston to deck on a GSR is bigger than an LS. like he said , putting a GSR crank , rods , and pistons in a B18A/B is pointless. its no better than what was in it. power wise. slightly. putting an LS crank and rods , in a GSR with GSR(P72) pistons , will bump your compression like a bag hair , not worth it either imo.

 

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

i dont think so. i think the piston to deck on a GSR is bigger than an LS. like he said , putting a GSR crank , rods , and pistons in a B18A/B is pointless. its no better than what was in it. power wise. slightly. putting an LS crank and rods , in a GSR with GSR(P72) pistons , will bump your compression like a bag hair , not worth it either imo.</TD></TR></TABLE>

dont agree with the last part of what you said...also im pretty sure the deck height of all b18's is the same...so putting an ls crank and rods in a gsr bare block would be the equivalent of an LS/Vtec

 

i was thinking bout puttin a ls crank in my gsr but heard that you have to remove the oil squirters is this true?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lVlemphizStylez &raquo;</TD></TR><TR><TD CLASS="quote">dont agree with the last part of what you said...also im pretty sure the deck height of all b18's is the same...so putting an ls crank and rods in a gsr bare block would be the equivalent of an LS/Vtec</TD></TR></TABLE>

b18c is 212.39mm
b18b/20 is 211.84mm

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc4teg95 &raquo;</TD></TR><TR><TD CLASS="quote">i was thinking bout puttin a ls crank in my gsr but heard that you have to remove the oil squirters is this true?</TD></TR></TABLE>

i asked earl about this (rip earl) and he told me there were no clearance issues. but if you're upgrading to forged pistons and rods, you really dont need the squirters.

 

That doesn't sound like a hurting budget to me. Factory manual would clear all of your questions up. I'm pretty sure the compression of an LS is 9.2:1

 

i was just gonna reuse the factory gsr rods and get a set of itr pistons. was told with the ls crank in a gsr it gives it more torque

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc4teg95 &raquo;</TD></TR><TR><TD CLASS="quote">i was just gonna reuse the factory gsr rods and get a set of itr pistons. was told with the ls crank in a gsr it gives it more torque</TD></TR></TABLE>

you need to use the ls rods with the ls rods

 

So the GSR crank, rods, & pistons will work inside the LS block??? My reason for doing this is that I have a shot GSR block (some pretty deep damage to the walls,) and I have a bare LS block just sitting here in my room... Might as well use it... Now can I take the oil squirters from my GSR block and use them in the LS???
My car is originally a '00 GSR by the way... Can't find another GSR block... Low budget and need help... Thanks...

 

according to the compression calc , which arent always the best , putting GSR crank , rods , and pistons into an LS block , is good for 10.5:1 CR. i was wrong before about only being a tad higher , thats actually quite an improvement.

 

putting oil squirters in an ls block would require drilling into an oil passage