Do you know at what rpm and hp is for these two engines? and which is which?

 

to reach a BMEP of 300 on a 383 cubic inche engine you would have to make 760 lbs at the flywheel at any rpm. So if the 300 BMEP is the max then 760 is the max limit a 383 can handle.

 

I respect what your looking for hear but i am interested in breaking this down further. What sets BMEP? What item fails setting max limit? The way i understand things is failures occur reaching or maintaining specific outputs like: 346 needs to spin to 4600fpm piston speed to make peak said hp, this piston speed takes its toll on cast piston causing skirt collapse, ring flutter causes ring land wear,tension loss.Ultra hi combustion temps cause softening of piston crown and ring land distortion losing control and seal.
Peak power rpm causes, rod stretch and distortion(exhaust stroke) causing bolt failure or bore failure pinching bearing to point of lubrication failure. These are examples of failures occuring to make certain power levels,boost would change limits of some of these by allowing lower rpms to be used to reach power goals. My point is weak link on LS1 would change in different scenarios of power making.

 

Just an estimate..but the 346 stock bottom end car should be making about 575-600 rwtq at around 4900 rpm.

 

I think we can all agree that max rpm limit should be around 6600 for a stock 01-02 ls1 (they have the ls6 rod bolts in them from what i understand). As far as all of the other possible failures, that is what BMEP is about. It is the engeniring term that describes the messurement of the energy that causes these failures. What i am saying is if we can figure out what the max BMEP is for the stock LS1 then we can figure out what is reliable power and what is not. The factory LS1 is running with a BMEP of 180 at max power. So we know 180 BMEP is a reliable raiting for these engines. Now if you go with say 8psi of boost from an ATI Procharger which ATI says is still a safe boost limit, then you are talking a max BMEP of 250 which will acurre around 3000 rpm and drop from there. So is 250 BMEP the safe max limit? I have been running 150 shot on my stock engine for a year now with no problems at all. I actually see about 130 hp incress due to my elevation but that shows a BMEP of 275 max at around 3000 rpm. So does that mean that the stock LS1 can handle 275 BMEP? As I have said before, I have read that 300 BMEP is the max you can run on a stock engine reliably.

What I am getting at is I am putting an ATI D1-SC Procharger kit on my car. I already have the NX 150 shot system. I paid 1300 for the entire NX system. I want to still use it. So I am trying to figure out how much juice to put to it and at what rpm to do it at. If I go with 280 BMEP as a max then I should be able to injest a 75 shot from 4500 to 6500 rpm. It will start with a 277 BMEP and drop from there to 205 BMEP at 6500. Of course there is the timing and good fuel to work with to insure the reliability of the engine.

Again, please don't think I am flaming because I am not. Any input from all will be greatly apretiated.

 

Like I said you're answering you own question.

 

As far as a tuff engine that can endure abuse keep on going, I say the stock L03 in a 305 TBI RS is about as tuff a mo'fo as you'll ever find. It probably as a BMEP off the charts...but it's dog slow.

 

holy ****, Black Bird went to the black of Camaro V8's, the 305, but damn true.

Waiting on friend to reply from "unofficial" GM camp answer.

 

It is goign to be hard to determine the exact BMEP the LS1 can handle because every engine coming off the line is different. Really all you can do is approach the limits of the engine carefully. Start off low on boost and spray and work your way up checking for signs of damage. There do not seem to be a great deal of people on this board interested in theory. From what I have seen most are good ol' fashioned try it and see if it works hot rodders. The question you are asking really has no definite answer.
I personally would consider 280 high for a stock street motor especially with hypereutectic pistons.

 

From the input I have been getting on other posts and seeing what others are saying their engines are producing, it looks like 280 is still a very safe limit and 300 is not out of the question. From what I gather 300 is realitively comin with the FI and Nitrous guys. Thanks guys for the input. I think I have found what I am looking for. Have fun and keep pushing the limits!!!!

 

Gen III's have to be pretty tuff because most of the family ends up in SUV's and trucks.

 

This should probably be in the advanced tech section...

CAT3 - Did you ever find the answer for Texas_WS6?

Edit:
I like diggin old stuff up

 

and one day i'll stop spraying at 2000 rpms. well, i'll have to with the wife's car as a 3200 converter goes in this week. then again, i've been told i'm not doing that as my factory tach is inaccurate. to what degree, no one can tell me. best i saw was 200 rpms low vs a dynojet tach.

oh and don't listen to me. i've been told i don't know what i'm talking about either.

 

here's some info i produced. maybe it'll help you out some.
https://ls1tech.com/forums/showthrea...ghlight=paging