im looking to spray some nitrous.. engines out of the car and wondering whats more important to replace for larger shots in the feture ...
pistons or rods is the question ?
whats everyone using with over 300 in nitrous...
any info would be greatly apreciated .

 

i ran lunati rods. great piece for sure. now im running GRP alum.

 

Id call Erik at HK he built my 400 shot motor and is building my new motor now. he knows his stuff and can set you up for what you want. I am running the calies compstar stuff with weisco n20 pistons

 

what kind of compresion should i be looking for for that kinda of shot ?
is replacing the crankshaft a must? im looking just to keep it 347 for now with rods and pistons....and some juice . anyone one else have different set up ?\\

whats the nitrous limit the actual aluminum block will handle ?

 

compression will depend on fuel, and car use.


alum block will take alot

 

In my opinion Id only hit an aluminum motor with a max 250(using rpm to help with the last 75 or so). I know guys will disagree but talking with my engine builder and what i have seen 250 is where it will get hairy. 300-350 on an iron block is where it starts to get real iffy. i have and others have sprayed more but for a new to n20 person id stick with a 250 on the aluminum motor and 300 on a iron motor.

As for the crank . The stock ls1 crank is an awsome piece it will easily handle the 250-300 shot. probably more but thats where it would be safe to stay.

Now don't get me wrong 250-300 isn't something all engines will take. it will have to be a purpose built motor and a porpose built drive train to do it effeciantly.

I would research some engine builders and your tuner and get with both before making a decision.

 

shiz, good info.

as for the stock crank, back in the day i hit my stock cube/stock crank motor with 300-350 never had an issue with it. the crank is a nice piece for sure.

 

Yeah ATv's ironblock stock crank has seen a tone of juice with no issues. I have never heard of anyone hurting a stock lsx crank on spray unless they spun a bearing but not breaking a crank.

I believe the ls motors can handle a lot as long as its done smart. use more rpm and it can live. mines been at 8400 and lived.

 

yeah thats also what i was looking too .. expanding the rpm limit..
as for rods ? whats a good set ..

as for pistons whats the -cc required for a bigger shot ?

a 200 shot will probably be the limit on the street... but im planing to run a 100 second stage on the track ...

 

I run around 11.8 It leaves a little on the table but i was able to hit it with a 350 shot on 94 oct pump gas. i like a thin head gasket with the head making most of the compression and the regular size valve reliefs. that way the pistons can be the strongest possible.

 

Shouldn't the conversation also entail how not to lift the heads? You guys
are the nitrous gurus...I just dabble with a little 150 shot here and there.
Just throwing that out there so the original poster makes well thought out decisions.

 

any more info >? will the block take the abuse or not >? i just had a friend of mine swear left and right that the aluminum block would not hadle the juice ... if not what other options would have for a 346 ls1 block in aftermarket form ???

 

i had my alum stock block with stock crank holding 300-350 making 700 rwhp for 2 seasons with no issues (besides head gaskets, which good heads helped)

i sold the block and it is still good.

 

i bought some L19 head studs to try to keep my heads from lifting, they look bad ***, hopefully they will do the job

 

I don't do anything special to hold them down. L19 head studs and commetics tq'd right. The right tune is the most important part of keeping them down.

 

so should i go ahead and build the internals and do the 300 shot on the stock block or should i go a diferent route ?

116 oct is the gas ill run when im on juice and i have a wide band all the time and a good tune ...

i think i might go ahead and do it .... any ont think this might not be the best idea.

when the block reaches its limits.. what will occure to the block ?? any first hand experiances will help.