What size Shot of nitrous?

Hey, well im going to be purchasing a built motor consisting of:

-B18a1
-ARP Head studs and Rod bolts
-Arias forged pistons 9.8:1 CR
-Shot Peened Rods
-Micropolished and Knife Edge Crank
-balanced and blue printed
-Rage Block Guard
-New Bearings, etc

what i was wondering is what kind of shot could i run with a stock b20z head with only 5,000 miles on the head? i was thinking like a 75…

and also what size shot could i run with a fully built head…like crower? i was thinking like a 125? what do u guys think

and of course i will have all teh fuel upgrades i was just wondering if you thought that the motor would be able to handle that amount of nitrous

maybe u already aware of this and maybe its not a big concern since u wont be on the n2o constantly. but have u considered a aftermarket clutch?

I have one its an Exedy…only stage1 but still aftermarket…brand new…am installing it with the motor

if it’s the full-face exedy disk, they’re only rated to like 220 whp or something low like that. just FYI.

also, if that engine is already built, i hope to GOD you plan on getting new pistons and rods. machining aftermarket pistons to fit on factory rods (which is what that setup consists of), or vice versa (machining factory rods to accept afmkt. pistons), SEVERELY weakens the part that was machined.

Aftermarket pistons belong on aftermarket rods. That is why the wrist pin configuration is different (pressed for factory as opposed to floating for aftermarket). If they were meant to be interchangeable, they would be designed as such.

as far as the blueprinting of the engine is concerned, do realize that a REAL blueprinting of an engine takes literally WEEKS to do…therefore not being cheap. many shops will say “oh yeah we’ll blueprint the whole thing for an extra 200 bucks.” Walk away. Blueprinting is the meticulous process of measuring EVERY SINGLE PART of the engine, to make sure it is making the absolute highest horsepower possible. Often times it involves buying 4 or 5 sets of parts (pistons, rods, valves, springs, etc.) in order to find enough parts that are EXACTLY the same dimensions, weight, balance, and fit for one engine. Every tolerance, torque spec, measurement, is made before, during, and after assembly, and often times each time a new step is performed, the engine is partially or sometimes entirely dismantled just to fix one small thing…one small thing which may throw the entire engine out of balance. “Blueprinting” an engine as most people use it just involves making sure the pistons are the right size, and everything’s torqued down to spec. TRUE blueprinting takes ENORMOUS amounts of time and money. If the engine was honestly truly blueprinted, and going in a street car, you my friend have wasted a LOT of money. My guess is with the piston/rod setup you have there, either someone is lying about the blueprinting, or is just saying that word to make the engine look more enticing. Either way it’s misrepresentation, false advertising, or whatever. Best thing you can do is find out who the seller had build the engine, and talk to them about it yourself.

The blueprinting info came from a back issue of sport compact car that i have in my trunk, but i can’t remember the date. i’ll look it up and let you know later if you want to read it yourself.

my expierence has always been to play the game of working my way up. using a 50shot on up. with those internals i dont see why u it cant run a 100shot on ur setup with the proper tuning.

wow lots of info

that block is what it is…its allready built and assembeled…and was blueprinted (he said ) at a shop about 30kmin from where i live…he says he has all the paper work, so when i see it i guess i will know what kind of “blutprinting” it was…

and the clutch is just the exedy clutch disk and pressure plate…

so ur saying those pistons on the shotpeened rods is bad ?

hummm never knew that

take a look at the July 2001 issue of Sport Compact Car (if you don’t have it, i highly recommend ordering the back issue from mcmullenargus publishing; there’s a LOT of really good tech articles in it that i learned from and have kept because of it). it will tell you everything you need to know about why most of the people (say 85%) who tell you their engine is “balanced and blueprinted” are either full of poop, or just don’t know what they’re talking about.