What is the bottom end in the le5 rated for?

 

most would say 350 hp at the crank


but hahn has had the le5 at over 400whp without problems////

 

The LE5 uses forged rods like the LNF and LSJ engines. The pistons are probably the next weakest link in that engine. I could safely estimate that 350 number as well on a constant basis. You can get over 400 if you have a nice tune and don't burn the pistons. The Hahn numbers are solid. They were actually trying to break the engine to see how far their turbo kit could go and were not able to break anything.

 

Thats good to know. Thanks!

Stu

 

Hmmm, this in nice to know.

 

its pretty strong for a stock n/a engine. im very happy with it.

 

its the 5 speed tranny u need to be concerned with

 

do you know how much the tranny will take before it gives?

 

it's rated to like 160lbs of tq
i'm not kidding

however, a lot of people have run it higher
i know a turbo2.4 running 250 lbs of tq

 

and thats the only reason why its great to be auto. ours is like 325

 

agreed

 

170ft lbs is the factory rated specs for the 5 speed, but as someone has said, theres a few guys running well above that limit without problems

 

The Hahn Racecraft Sunfire drag car uses an F23 trans. It's making over 500 HP.

 

Is there any way to beef up the tranny to be able to take more? Sorry i don't know too much about trannys

 

SEARCH i have posted this info many times as well as elecblue.....trust me the engine will handle approaching the lines of 350-400 before it goes...some say it isnt but its designed for power...after all it was designed in light of the older saab turbo motors

 

would you be able to send me a link to where you discussed this

 

info posted by my bud....thanks elec! this should hold you over...just pick whatever motor you fancy and have at it:

https://www.cobaltss.net/forums/general-cobalt-68/info-all-balts-engine-internals-tranny-118908/

 

I hear the weakest part of the manual transmission is the clutch.. replace that and you help your transmission problems by quite a bit.. its just what I hear though, I have no real proof to support that.

 

thats a proven fact with any transmission and the addition of power past its original intent

 

Well there ya go, that answers B_chobos question about how to beef up the tranny

 

thanks for the info.

 

isnt theirs a built F23 though...as in more done to it than a simple clutch swap?

 

People need to stop pulling the transmission card every three seconds around here.

The F23 is more than capable of handling over 400whp, people with cavis have done it.

 

isnt the rating gm gives what the clutch is rated for? not the tranny itself?

 

i think soo.. but i'm not positive..