I was just curious who has shortblocks built primarily for nitrous. I am going to have a shortblock built by speed inc. in the near future and was wondering was pistons/rods you guys are using. Basically can I get away with using eagles instead of lunati's? I will be running a 150-200 shot of the gas as soon as the new NXL kit comes out which should be real soon. The cam I will be using is the nitrous cam speed inc has and I have TEA 5.3 stage 1.5 heads.
Also are there any drawbacks to using a 4400 stall with this setup?

Thanks for any info.

-Wes

 

The eagles are fine. Are you gona use an iorn block or what.

 

Nope aluminum but I will probably keep the shot around 150 most of the time.

 

I am in the process of building my motor for direct port spray jetted at 200 to start with. I have 6.2" lunati pro billet rods and a custom set of diamond pistons being made right now for the rods. I am looking at using gapless rings for the top 2 rings and a stock oil ring to eliminate the oil comsumption common with these rings. I am going to stud the mildly ported heads and use felpro head gaskets. The bottom end will remain stock and the whole rotating assembly will be balanced. The cam will be a stock 2002 Z06 cam which is an awsome nitrous cam due to the lobe seperation.
Your convertor will be fine if you have the suspension to put the power to the ground. I have a PY3600E and on my old setup Stock motor with headers and a 175 shot i was pulling 1.4 60's and 10.80's-10.90's@ 124 consistantly.
If you use the eagles upgrade the rod bolts to the best they have when you order them. It will only cost about 100 more but its worth it.

 

Are you using stock valves on your ported heads or having them replaced?

 

dont use gapless rings with nitrous...or at all for that matter... also if you do plan on tearing ur engine down like 20k mi for new rings is what i was told

 

I will be replacing the stock valves with aftermarket ones and i would recommend the same. I am building this new motor because i went really lean my last day at the track last year ( i also dont recommend running a large shot on a stock fuel system ) and in the process of melting a plug i developed a wicked miss. When i tore the motor down all i found was a intake valve that was cupped like it got pulled into the valve seat while red hot and a bent pushrod which more than likley happened when the valve cupped making it longer.
I dont plan on keeping this set up for too long hence my decision for gapless rings. This is just a temp setup until i build a big inch stroker in the next couple years.

 

Well with the heads I bought I have a stock valve on the exhaust side. I think that it will probably hold up to maybe a 200 shot. I am hoping it does anyway.

 

You oughtta' try running a larger gap on the second ring. This will reduce or eliminate ring flutter. Run a real tight and narrow ring package, with low tension rings and some type of crankcase evacuation system. That will solve the oil consumption problems, without sacrificing horsepower.

 

Port the sh*t out of your exhaust ports, and run as big of an exhaust valve as possible in relation to the intake. Getting airflow into the engine with nitrous, isn't much of a problem. Getting the added squeeze out more efficiently helps.

 

What's wrong with gapless rings?

 

they increase cylinder pressure too much...

Piston companies recommend a bigger gap in the ring for Nitrous compared to NA

 

my new set up is...

Abs Spd Stg 2 Heads (Rev 2.02/1.57) w/ CompCam 977/Ti Retainers
232/230 .595/.591 114 XE-R
Diamond Pistons & Rings/Lunati Pro Billet Rods
Stock Block/Crank 3.905 Bore ( 348ci )
ARP Main/Head Studs
Cometic Head Gaskets
Modified Lifters
T&D Shaft Mounts w/ 7.250 Pushrods

Nitrous Kit is Ind Fuel system
NOS Pro Race Fogger System w/ NOSzels 100-300hp

 

4400 is real high for nitrous... i run a PT4000

your 4400 is gonna flash to 6k right off the bat

Upgrade ur fuel system... get a racetronix or simular... i was told by Cartek that even with a Intake/Inline fuelpump that their Head/Cam car couldnt keep up with 150 wet kit on top of it with stock fuel lines...