this might be a dumb question to ask but... if u have a ls block with a gsr crank... would that be considered pretty much a gsr block without the oil squirters?

another question, what belt sizes should i run with this setup? im totally lost on this one. this is my first real build from the ground up, so im still learning all the technical stuff.


Modified by bnut510 at 8:51 AM 7/2/2007

 

no. it will still have lower compression than a gsr. unless you swap pistons also.

 

pistons are swapped to a 25. overbore type r pistons with a b16 head with type r valvetrain.

 

the displacement will be same as gsr but the block itself is not as strong. it will work fine though.

shawn

 

interesting.. i also thought of this... but what is the reason that the ls block isnt as strong as the gsr block? just curious cuz this its what i am working with right now. its basically a bunch of spare parts i had lying around, and i threw pieces together to complete this motor as pretty much a backup.

 

It is an odd setup, although it can be very powerful. It is in no way weaker than a GSR block, same thing, get a stock gsr block girdle or after market one, and just check all your clearences, you will be good to go.

 

i got everything back form the machine shop already.. they did a full job on it.. hone, decked, valve job, micropolished crank, bla bla bla... i was just wondering what i had really lol. i know its an odd build but i am using whatever spare parts i had laying around on this setup. anyone else with some input?

 

if you compare the blocks next to each other you will see that the gsr block has more braces through out.


as i said the ls block will work fine. i was just listing difference between the 2. they are not the same.

shawn

 

which rods are you running?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Broken Gearbox &raquo;</TD></TR><TR><TD CLASS="quote">which rods are you running?</TD></TR></TABLE>

i gave my machine shop guy a bunch of rods that were already out the car. i baught a block with a bunch of misc parts from a friend of a friend. anyways it was a bunch of **** in there and i told him to just make it happen. but frm what i remember im gonna say ls rods. just some stockies, i figure its just gonna be pretty much stock so itll be ok.


btw, anyone know what belt sizes i should be using with this weird setup? i edited my first post asking about this as well. thanks for the help

 

if u use gsr crank u need gsr rods... and your compression will even be higher than a stock b18c or b18a with the 89mm crank... trust me on this... i KNOW what im saying from first hand experience

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris Tune &raquo;</TD></TR><TR><TD CLASS="quote">if u use gsr crank u need gsr rods... and your compression will even be higher than a stock b18c or b18a with the 89mm crank... trust me on this... i KNOW what im saying from first hand experience </TD></TR></TABLE>

u could be right, i wasnt sure to be honest. yea i know dummy move.. anyways, any help with the timing belt size? its also with a gsr water pump.

 

gsr water pump use a gsr belt... LS will be too small... i havent seen it that way... i have seen LS water pump gsr belt, with the belt adjustment all the way its still HELL loose...

 

thx man, thanx for replying on both my posts lol. do u know about the tq specs for the lower rod connect that connects to the crankshaft? im asking this because i had took the gsr oil pan out and seen that the pick up was connected to this big piece of alum. (wish i knew the term). i dont want the motor falling apart on me. i keep having dreams of disaster lol.

 

the "thing" that connects the 3 main center caps on the crankshaft?

 

the lower piece of the rod. that half round piece. i guess that would be the tq specs for a rod then? i think?

 

89mm crank will have higher compression than a 87mm crank if you are using the same pistons.


you can notice this when you look at a b16a piston its dome is larger than a piston for a 1.8ltr to equal same compression. as you increase the displacement you dont need as much of a dome.. unless of course u want much higher compression.


shawn

 

per oem specs if it has stock rod bolts it goes in 2 steps...

1st 14ft-lb

2nd 33ft-lb... use some type of moly lubricant or 10-30 oil on the threads...

or if u know how to stretch the rod bolts 0.13 - 0.15 mm

 

depends on which block ure using

 

explain your theory. the concept is the same regardless of what block youre using.

 

not a theory...

all the block i have done LS block gsr/R cranks rods the pistons STICK out the block.. .020 is kinda norm in there... with the pistons residing in the block with LS crank u got more compression with the GSR crank in LS block... even thou i have done all but a few but they all showed the same tendency. .015 - .020+ out the hole... and the same block with LS crank rods they come close to -.018 - .020 IN the hole...

 

pistons are itr pistons .25mm over if that makes a difference