Ok, I want to run just a 4.5psi powerdyne or the like on my impalla lt1. Now here's the deal with my setup. I bought this engine used but completely rebuilt. The guy built this a couple years ago and couldn't remember what kind of pistons. He said they probably weren't forged and thought they were cast. Not sure if they were hypers. But he did mention that it was rebuilt to stock compression. I also DON'T have a knock sensor system on my car. It was deleted when I got my pcm tuned and I don't have any of the knock stuff anyway. I'm also ONLY have an inline pump on my car as a stand alone system since my car origionally came carburated. I am gonna upgrade to a 247LPH inline pump as the only pump on the car. So, assuming that I have cast pistons, no knock sensor (I would get the pcm retuned so it's set up for boost), and a 247lph inline pump as my only pump will I blow running 4.5psi? The engine has about 500 miles on it right now so the mileage isn't a problem. Thanks for any help!

 

I guess if you swing that way. . . to each his own. . .

Not sure what that has to do with Camaro's, though.

 

ok children...thanks for the help

 

Ok, ok. . . let me get out my Crystal ball. . .

Didn't the Impala come with a 262 cid motor??? (unless it was an SS)

We don't know what kind of pistons are in it.
More scary than that, is that it was built by someone who doesn't know what kind of pistons are in it, which makes me question the quality of the rebuild.
No knock retard system.
ECM with questionable tuning (mail order?).

The crystal ball says that. . . YES. . . there is an 80% chance it will blow up within the first 1000 miles.

Mike

 

I think the question is ( Do you want to risk it? )

 

Well knock system doesn't concern me all that much as all the mustangs don't have them and they are kings of blowers IMO. I KNOW you can run boost on a cast piston so I was going as that being absolute worst. I've personally run 150 shot's of n2o on them before for a long time with no problems, I've also been a previous turbo buick owner and they have some sort of cast pistons stock . Boost doesn't kill pistons, detonation does especially 4.5 psi if I made sure to keep it out of knock (I have a knock gauge system but no knock retard). I have a mail order tune by pcmforless, but had a blower on a previous 95 t/a and a "safe" tune from him and it was fine. I was really concerned about the fuel pump. The pump is rated at 247lph@70psi. And running 24lb injectors. Also it's from an ss so it's a 350. Also the guy didn't build it himself and had a machine shop do it. I checked some of the clearances without ripping the whole thing down and the ones I checked were on the dot. He has so many lt1 projects over the years he forgot what pistons were in it. I'm buying a set of le3 heads right now anyway so I guess this post is kinda worthless right now anyway. But thanks for using the crystal ball for me...I feel so privlaged...

 

Who says this is a camaro only forum, or even fbody for that matter? As I recall the tech sections of these forums are called "LT1" and "LS1" not "camaro" and "firebird" SO that would make the other sections support for THOSE engines and drivetrain. Just my 2 cents, dont flame people for asking a question!

 

Check the web site name.

Besides, I was joking about the title "Will I blow?". It's a personal decision, really.

 

Also, the Turbo Buicks have cast pistons with internal steel reinforcement.

 

Don't forget, turbo Buicks also weren't 10.5:1 compression motors, and they have a computer that can actually see above 0 inches of vacuum. Also, running nitrous through a motor is a little different than running hot, compressed air though it.

Looks like the consensus here is "probably".

 

It doesnt have to do with camaros but he's asking a question about a FI LT1. Lots of people come in here with similar questions and you never got on their case about it...

 

Let me be as clear as I can about this.

The title of the thread is "Will I blow?" Since "blow" is a slang synonym for "perform felatio", I made a joke about it. But I don't understand what that has to do with Camaros.

And you are right, this question is asked at least once per weak.

Mike

 

If it's a 350 then it should handle 4.5 no problems.
With a 6 lb pulley I couldn't get more than 4.5 lbs
and the 9 lb pulley gives me 6+ if I rev it high enough.
You may only get 2 and change out of the 4.5 pulley and any engine and fuel system can handle that.

 

just bustin your ***** anyway engineermike, btw let me know if you do happen to *title* so maybe I can make reservations! :P

 

I know this question gets asked here a lot but I was concerned about the fuel system more then anything else cause I didn't want to lean out this thing and detonate to the moon. N2O is deffinitly different, I agree. But I was just using it as an example that cast pistons aren't that bad. Yes the buicks have a lot less compression but I was meaning to use that as an example of cast (yes the stock pistons are better then regular cast ones ) And their low compression=more boost. Like you can safely run over 20psi on their stock bottom ends, so I was thinking that even with my 10:1 (impalla engine ) I could get away with a measly 4.5psi. Like mentioned I'm sure I wouldn't even see that on the gauge. I had a 6psi kit before and only saw 5psi with the belt SUPER tight lol. I've seen stock carbed engines with cast bottom ends running roots style blowers up to 8psi with no problems and I've seen them blow too. Granted they usually have lower compressions the roots style's heat the air a LOT more then centrifiguals and screw types. They make boost in the intake and not the blower. BTW, I found out that I have hyperutectic pistons anyway. The guy I got it from found all the reciepts so that's not as bad . And I know the title sounds funny so I didn't care about the remarks. I'm not one to go home and cry hahaha. Thanks guys!