almostjdmeg

Im trying to put pistons from a 1997 GSR into my ls and i tried to put the rods in the pistons but the rod is to fat to fit. Should i machine the rods or the pistons so that they fit together? THanks

90rexboost

IMO..As long as you use the ls crank with the ls rods..You must remove 1mm of material on each side of the small end of the connecting rod in order to have sufficient clearance where the rod meets the piston. Any automotive machine shop can easily do this operation.

almostjdmeg

Are you sure its 1mm? The machine shop guy said he could do it but it would be $65. So i just want to make sure that i get it right the first time.

90rexboost

yeah thats the magic number..I had ma ls rods fitted with ctr pistons and i had ma machine shop shave 1mm off each side of the small end of the ls rods. This is option is recommended for proper piston/rod clearance..

DonF

Or cut .040 of each piston boss, which is the correct way to do it. IMO

oldskool teggy

piston vs rod? which is better and why?

slightly off topic but usefeul.. to the OP.. why dont you use P61 pistons?? they fit perfectly onto your LS rods, with no need to machine.. even slightly dished, they equal if not slightly more compression than the P72

almostjdmeg

Well this is just a thrown together build, i just happened to have these pistons sitting in my garage and i go to a technical school so the machineing is free so i figured i would just use these. For future reference though what motor do the P61s come out of?

almostjdmeg

Also the shop teacher machined the rods but they are a snug fit, is this alright?

GSR_hatch936

What happen to to the gsr rods?? y not use them?

almostjdmeg

I dont have them, i just have gsr pistons and ls rods.

GSR_hatch936

Try to get the Ls crank and use the ls rods and the gsr pistons. Might need to do some moving on the oil squirters but shouldnt be too hard.

almostjdmeg

Thats what i have, these pistons are going into an ls vtec

oldskool teggy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by almostjdmeg &raquo;</TD></TR><TR><TD CLASS="quote">Well this is just a thrown together build, i just happened to have these pistons sitting in my garage and i go to a technical school so the machineing is free so i figured i would just use these. For future reference though what motor do the P61s come out of?</TD></TR></TABLE>

P61 pistons.. are a direct fit into LS rods, they come out of the B17.. or 92-93 integra GSr

pistons should be able to swivel freely on the rod,with minimum side-side mvement

civicguy

mine is done like that ls rods/jdm type r pistons ,dont worry you will be allright

91Ef4dR

nice thread guys. helped me alot, im puttin jdm gsr pistons on my ls rods for my ls vtec as well, thnx

BMo Tuning

streettuneprod.

u have to grind them and smooth them i have them in my set up gsr pistons ls rods