i have heard rumors that ctr pistons will not work in an ls vtec due to the positioning of the wrist pin. i would like to run ctr pistons on gsr rods in an ls vtec, feedback wanted. thanks.

 

You can use the CTR pistons on the LS rods. Everything I've ever read say to use LS rods or aftermarket rods for the LS. Dont think can use aftermarket rods with OEM pistons though. Something about a floating wrist pin for aftermarket rods (dunno) just get the LS rods shot peened or get aftermarket rods/pistons

 

i can get some already on gsr rods, they are a lot tougher looking than my ls rods. it seems that the ls and gsr rods are the same length, just that the gsr rod sits higher up in the piston compared to the ls setup. i think that pistons made for a gsr might have a different compression height. anyone confirm this?

 

well if its the same length are the caps the same size where it goes on the crank?. I've always heard/told to use the LS. But if it just looks stronger and thats the only difference it may just work. GS-R does have a higher compression ratio compared to a B18 caused buy the dome on the piston at least, unsure about the rods

 

HAahahaha, please put it together, I need a good laugh!!!

 

what is that supposed to mean? put a bad setup together, to have it blow up, so you can have a laugh? that is why i am asking these questions in the first place.

so, the question is still up, is the wrist pin height of the ctr piston compatible with a gsr rod on an ls crank? in a b16, the only modification necessary is to machine the wrist pin side of the rod in order to fit the rod in the piston. it would make sense that the wrist pin is in the same spot as a B16 piston, because they work in a B16 with no clearance issues. i have a friend using B16 pistons in his ls vtec, but it does look like the compression height (in the hole) was closer to zero compared to his B16.

 

A GSR/Typer rod is 5.433"
A b18a/b,B20 rod is 5.394"

This is just reference but as you can see the rods are not the same length.

 

See these for more info:
https://honda-tech.com/zerothread?id=164811
https://honda-tech.com/zerothread?id=281079

 

looks like the difference in the gsr rod ( .04" ) would be enough to make up the compression height, and the dome of the piston might get no so friendly with the head.

how about gsr rods with B16 pistons? would the valve reliefs be sufficient for CTR cams?