not of this matters a lick to racer or someone that wants to go fast,speed costs.there is no race warranty,no engine builder will give you one.I can't warranty vehicles running on 93 r+m/2 pump gas, meet emissions or afford credits running the stock crank (LC2) at 500 fwhp. Knowledge & capability grows with necessity & experimentation. Same thing with blocks. Some live longer than others at elevated power due to preparation / controls / or just a stone stock car. Bottom line , you can't sell cars to the public and tell them they are out of warranty because they made more than 200 passes in the 1st year of ownership.
no worries,thank you!the truth of it is alot of blind faith was given to those back in the day.then guys started testing and pushing things but the turbos and computers in reality just sucked compared to what is out there today.the auto correction and the data that can be obtained is just awesome.the cars are tuned better and the shocks and tire tech and drivetrain teck(driveshaft speed sensors,converters),with alcohol based fuels is incredible,thats how we are going faster, we know more ,can control more, and can apply more.i feel alot of guys on this board just dont understand about the new tech.I don't wish to argue with anyone regarding the performance of critical parts which are not well documented. Tuning, machining & preparation of hard parts has come along way since 1986. I'm just relating what was said by by the best with documented proof (dyno testing) back in the day. Your comments are well taken & I applaud your efforts.
remember no one is saying a forged crank is not stronger than a cast crank.what i am saying is that when the motor is built correctly for those components /tuned correctly,the op will be able to run his 10 sec passes without to much worry of hard parts failure.i really dont care which crank he uses,but people who think the stock cranks are weak are quite wrongThe thing is the factory would have used average material properties (or maybe a more conservative set or properties based on how many failures they would have thought acceptable), which accounts for defects like inclusion, porosity, variation in the casting process and machining process... And then depending on inspection methods and expected escaped defects, would try to develop something that supported making money with an acceptable risk of failures. So obviously we get a variation in factory parts (is probably quite large), and some parts will tolerate more abuse then others.
The other thing is, would cracks show up in the block at the same locations and at the same power levels if a forged crank was used instead of the cast crank all else being equal? Not something practical to test, just something that would be interesting see what various configurations can handle and where the weak spots are.
The one big benefit of a forged piece over a cast piece, so long as it is done correctly, because anything can be done cheap and be junk, is the forged steel is going to have better material properties and less material defects just because of the process used to make a forging over a casting. Chance of an inclusion is an order of magnitude smaller for forged vs cast, much better fatigue strength, yield strength, larger elastic strain range....
Hot rodding is about innovation and extracting what you want out the machine, so I don't think anyone is being critical of your work. That is pretty cool extracting that kind of power out of the stock stuff. Each individual has to evaluate their goals and decide on what the appropriate level of risk is for what they want to do. The engineering and the physics, along with the way the factory would have evaluated the stock parts, would point someone to use a forged crank for elevated power levels. For your goals, skill set, and risk tolerance, the factory stuff obviously is working. It is also a testament to the conservative nature (at least back then) that GM used to evaluate and rate the capability of their parts.
I don't hurt the webs in a stock block with a stock crank,you haven't been paying attention.put the summit 4140 in it like in your post,if the motor is built right and tuned correctly you wont have a problem for a long time,especially in the 10 sec range.But it is also more rigid and that to me is the thing I want to Include as that wiggling stock unit is what takes out the webs in the block in my opinion.
i gotta say im impressed with what eric has done with the chips.to be honest ive never really liked xfi,that may not make some people happy but one could argue xfi is old teck like those that feel about the stock ecm,i do really like the holley ive been spending alot of time with that system lately and its impressive,i dont have any experience with the gnecu so i will not comment,but there is lots of good stuff out there and it doesnt smack the wallet like a fuelteck.guys go fast on alot of different systems,better nowadays is how many inputs you have for dataSounds like I need to get rid of my XFI and go back to burning chips on my 386 25 like I did 20+ years ago.