TheShodan

iTrader: (14)

Still good here.. 4.5 years, 40K and running strong. haven't touched a thing.

DazeMS

why would you run ls rods and pistons? They would decrease your compression if you are going for all motor. Running an LS crank with GSR rods and pistons would raise it above stock gsr comp. while also raising displacement. best of both worlds?

jaydmdude

I doubt people running this setup is going to be using stock ls pistons. The reason why people choose to run this setup is for the small bump in displacement and you can't use gsr rods on an ls crank.

TheShodan

iTrader: (14)

Actually, no. I think you've misunderstood. we're not talking using Stock components, but LS length aftermarket rods and aftermarket pistons.

kyden

try that and report back. you're gonna have some pistons coming out of the hole with gsr rods.

cruizinmax

iTrader: (2)

You don't run GSR rods on a LS crank due to the above. Also changing the length of rods does not change the displacement of the engine. You can run gsr pistons on ls rods though and that will increase the compression.

DazeMS

assumptions assumptions.. GSR "style" rods are longer then ls style rods.. I dont see what the issue would be considering the combo I mentioned would only be by about ..002 Im pretty sure the p2v clearence would be fine..

DazeMS

... herp derpy derp derp.. no ****. did I say it did? and you will have still fallen short of a stock gsr comp.. effectively making this ordeal worthless.

DazeMS

neither am "I" .. but if using aftermarket pistons , what comp would you start with to get the desired benefit, while upping the output of the gsr from its stock comp or even back to its stock comp?

nevermind.. i calculated my own question..
Seems running and ITR style piston on an LS rod and crank would be pretty doable.. comp would be around 11.8:1

cruizinmax

iTrader: (2)

The way you worded your statement sounded as if you were saying by installing the longer rods you would be increasing your displacement.

Also GSR rods and a LS crank has been tried. With oem pistons they protrude above the deck of the block and would hit the head. You would need pistons with a lower compression height to use the longer rods.

GSR longblock and LS rods/crank=10:1=same as GSR

DazeMS

Gsr usdm is 10.0:1 jdm is 10.6:1

Eg.ls.turbo

I have pics on my profile on the same build. I used type r pistons and blocked off oil squirters, even bending out the way my crank on the counter weights still hit. Been running for 3 months and love the gains I got.

DazeMS

Nice... that is a setup I would like to see dyno tuned.

Eg.ls.turbo

Yep I will post up pics whenever I get it dyno.

cruizinmax

iTrader: (2)

If you used jdm gsr pistons, ls crank/rods you would have 10.8:1...Just drop it, you're not making any sense.

DazeMS

I was referring to stock comp ratios. I already mentioned it would RAISE comp with those pistons. herp derp. Doesnt matter anyway, wiseco makes a -2.40 dome piston that would make the comp on a 81.50 bore 9.91:1 which is close to usdm. And its an off the shelf forged piston. to make it stock comp on 81.5mm bore, you need a custom pr4 piston at -1.90 dome to be 10.0:1. throing in a stock ls crank rod and piston setup will not yeild stock gsr comp. as it would be 9.6:1 on an 81mm bore or 9.7:1 on an 81.5mm bore.

EDIT.. what would be cool is if, you could get a 137.5mm rod to throw in with stock pr4 pistons as that would take your comp to 10.1:1, but no one will make those unless you sell or buy 40sets lol.. just cheaper getting a custom pr4 piston set at -1.90

TheShodan

iTrader: (14)

Well, if the goal is to get stock compression, I see why you're going through all this work, but most of us that have performed this particular modification in the GS-R block (by removing the oil squirters) have the desire to raise the static compression as they are usually using an aftermarket rod/piston. Not keep it to stock. I'm currently at 12.3:1, and with the fuel used on 93 octane have had no issues for several years.

I am curious... "herp,derp?" What does that specifically mean?

DDTECH

I believe it is a slang term that is more then likely in the same catagory as "duh", or "ORLY".. I have alot of friends on FB who use "derp" as a term sometimes, and i normally see it used when something is obviously, obvious.

TheShodan

iTrader: (14)

This means I'm getting old. Even THAT **** doesn't make sense, and I interpret a long of slang. . That's that FaceSpace and MyBook kinda talk I don't get into.

AllMtrRex

Me and you both. If someone was to say "herp, derp" in a face to face conversation, it would take all I had to not laugh in their face.

DDTECH

I personally, would have to hold myself back from punching them lol.

accorse07

X2

DazeMS

HERP phuckin DERP... I will be more then happy to say it to your faces.

DazeMS

I was using herp derp for "duh".. "no way man(sarcastically)" "no ****".. I have a setup that I am looking at doing. Sorry it does not agree with what YOU may want for a NA setup. I was just trying to find a happy medium that didnt require custom one offs and after talking with several manufactures, parts for the options I am after , quite literally are just " sitting on the shelves" , including a custom LS 95mm crank and rod setup for like 1200$ which will clear the oil squirts..While , I do not want a 95mm crank , they do have new standard ones sitting around. I refuse to use junk yard parts in my area for these kinds of things, so thats what I was getting at..

90efhatch

I just finished putting my bottom end together, just waiting on a new oil pump and PasswordJDM oil pan baffle to come in to finish the motor. Its an ls crank with ls Eagle Rods and Wiseco pistons.