ls1 crankshaft limits
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From: toronto ontario canada
ls1 crankshaft limits i need to know what the factory ls1 crankshaft hp/torque limit is. i am currently building a low CR 347 and looking for maximum 600hp. and need to know if the factory crank will handle the power. i know this question has probably been asked before but the search did not show me anything i am looking for.
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Thread Starter
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From: toronto ontario canada
no i am not worried at all. i am just aiming for 600whp, and hearing that they are good for 800 makes me happy that i do not have to drop another 1000bucks on a new one.
thanks again for all your help.
thanks again for all your help.
I believe they have been run upwards of 1500 HP. How ever I am sure for that power level, They have been modified. Most of those guys don't want to say what they have had done but if you talk to any one of the high end Crank Grinders they will tell there are several ways to make them live at those power levels. Such as the Various types of heat treating, Nittrating, Cryo treating, Hard chromeing the Journals for better wear, Knife edgeing, Profiling The weights, pendualem cutting the weights, And so on.... There are so many different ways to modify a crank to make it live at higher hp levels But one of the big factors is balanceing the rotating assembly and keeping the weight of the rotating assembly on the lower side of things.
https://ls1tech.com/forums/forced-in...k-6-0-lit.html
Stock Factory Crank with A turbo spinning up wards of 7700 RPM
I know there is another one that was like 1450 but I can't seem to find it right now...
Stock Factory Crank with A turbo spinning up wards of 7700 RPM
I know there is another one that was like 1450 but I can't seem to find it right now...
thats good info, because i was planning to build a n2o motor and if the crank can hold 600rwhp that will be good. I was wondering what the rest of the rotating assembly is good for such as the connecting rods, i plan on replacing the pistons with forged ones.
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You could probably throw as much horepower as you want at it, but the torque is what limits the rotating assembly. Torque is a force, horsepower just dictates how fast you can use that force. Of course, the stock lower end is reliably designed for 6000RPM, but you can throw more at it.
I could be a little off on that statement, so correct me if I'm wrong.
I could be a little off on that statement, so correct me if I'm wrong.
Most aftermarket forged pistons for this application will have a smaller .927 floating pin and be designed around a 6.100 or a 6.125 rod. There are some pistons with a 9.450 pin but you will have to bush the rod since they are floating pins. Forged rods are cheap enough now that upgrading a factory rod with better rod bolts and having them bushed for a floating pin application is just not worth it. I have seen stock rods fail in a complete stock application for Various reasons then there are guys that will tell you there putting down 500-600 at the wheels with stock pistons and rods. Some of those are in big heavy trucks too!