ok that clears up the misconception. get the ctr pistons then but ditch the forged rods. sell them and buy some cams or something to go along with your spray.

 

already got crower cams on the way , seriously whats wrong with the eagle rods on ctr pistons if its not guna raise compression that much?!

Is the that the ls rods hold up the same with ARP rod bolt? and i could sell the h-beams and have money left over for other stuff? is that what your tryin to get at lol

 

its that the oem pistons will fail before the stock rods...therefore you dont need aftermarket rods unless you have aftermarket pistons.

if you use the new rods on the oem pistons and spray too much the pistons will fail. if you use stock rods and stock pistons and spray too much the pistons will still fail. either way your weak point will be the oem pistons, so the upgraded rods are useless.

im done, if you dont understand that i have no idea how to explain it to you.

 

This is how it works in order to run ctr pistons.

The first thing you have to do is have them fly cut and rebalanced to fit ls rods. Then you have to have them machine to accept c clips in order to retain the floating wrist pin since eagle rods are NOT press fit like oem.

So say a set of CTR pistons with rings costs $250 then you have to spend another $100-150 on the machine work you might as well have run forged pistons to begin with and had the strength. Cast psitons in a nitrous motor are going to be the week point not the rods. You'd even be better off with forged pistons on stock rods.

 

i hear you guys..and understand completely what your saying, but whose to say that the pistons wont hold up on say a 50 shot if not assembled right?

or are ctr pistons just known to be weak under spray?

 

brandon.... ANY oem piston is weaker than a forged one. doesnt matter what it is. what these guys are tellin you to do is basically either run all oem stuff or upgrade to forged pistons with the forged rods, or put a forged piston on an oem rod. your wastin time tryin to get ctr pistons onto those forged rods.

my vote, buy some p30 (jdm b16) pistons and have them pressed onto some stock ls rods with arp rod bolts. if assembled correctly that will hold a decent shot of the sissy juice no problem. but still the pistons are the weak point. if you dont do that then at least sell the rods n get some forged pistons instead. runnin forged rods in this setup isnt doing you any good.

 

you dont need forged internals for spray. i have a friend with a stock ls in a crx on a 75 shot running 8.7 in the 1/8th.

 

im not sure i understand what you are trying to ask, but hopefully i can answer it.


picture a piston comming up on TDC, gas explodes...all that pressure is put on the piston. the pressure is held back by the rings(made of some hardned metal), the rings sit on a 1/4" (give or take) piece of the piston. that means all the power of the engine is being placed on 1/4" of cast aluminum. this power is directly transferred to the rod via the wrist pin. (which are both steel) the thinnest part of the rod would be the weakest point (which has a diameter between that of a nickel and a quarter) which has to hold all of the force. the rod pushes on the crank (which is forged and cast steel<---stronger than aluminum)....whats the weakest point? will the weakest point change if you put in thicker or strong rods? no, the ring lands will still break first.

its not that "CTR pistons" dont hold up under nos, its that "pistons" dont hold up under pressure-which translates into power

 

gotcha, say i sell the h-beams and get into a set of forged high compression pistons and use the stock ls rods with ARP rod bolts, i wouldnt have to worry about all that pressure and "power" messing up a stock ls rod correct?

and lets just say i had both the eagle h-beams and forged pistons, would having them both "forged" help anything if im just spraying or is it all in the pistons

 

not in the amounts that you are talking about...either way you can push more power outta stock rods that you can stock pistons.