Has anyone ever destroked a 2.4 using a 2.0 crank ?

 

nope

 

I'd think that you could run 2.4 sleeves and custom pistons in your LNF. It should bring you up from 122 to 131 cubes(2.14 liters)

 

How about 2.4 crank and rods mated to LNF pistons for a 2.4 DI turbo? Benefits - extra 20% displacement to spool larger turbos

What are the bottom end differences among the LSJ, LNF and LE5 anyways?

 

what i was thinking of doing is taking the 2.4 block and crank with custom pistons and rods and then putting lnf head and bigger turbo parts.

 

I think it will be awhile before we start seeing stuff like this with LNF's (or until people have there cars paid off at least). Took the DSM guys for ever to jump on board for a 2.4 DOHC turbo or 2.3 Stroker mix matching parts between the 2.4 and 2.0 block.

 

According to the GM website both the 2.0 and the 2.4 use the upgraded Gen 2 block which has extra material cast in it. To bad the 2.4 crank isnt forged. Im talking with Ross on some custom pistons. They want $730 with rings. We carry Ross so I should be able to get them for jobber which is quite a bit less.

 

Mostly because you have to have both to figure it out . How many of us have a 2.4 complete assembly and a 2.0 just laying around to measure and swap to see what will fit/work? lol.

 

I looked into this extensively for the LSJ.

Conclusion? Not worth the work, you could just sleeve the block and crank up the boost for much less $$$

 

I have a 2.4 engine and a spare turbo head , and a 2.2 head and will start researching the demensions etc. Right now Im contacting piston and rod suppliers to find prices on custom parts.

 

The problem with adding cubes is that you are still stuck with the same fuel system. Making 600whp on the 2.0 would be no problem if the fuel system was adequate.

 

i've always been told that rpm's generally = boost

a square bore/stroke tend to be more stable at higher RPMs, thus more reliable.

my $.02

 

Could be right. Many high power pro cars run very large bores and short strokes though. So it remains to be seen on the LNF.

 

that only equates to higher rpm for faster turbo spool up, iv been looking into doing some swapping around( aftermarket stock dimension) parts...unless your looking to make aloooot of power, probably non streetable, its not worth it as a dd...if you figure it out before i have the time and money at the same time, then please post a how to thread w specs lol

 

it is much more stable, and GM probably does it for warranty and driveability issues. im sure youve noticed, but people buy the cobalt SS's and they expect them to ride like a 5-series. could you imagine how poeple would cry if it wasnt so smooth in the top end? haha. so my feeling is pretty much what you said (reliability)

i know htta the LSJ and LE5 share main and rod bearing journal sizes, so my guess is all the journals are in the same place.

LSJ/LNF - 3.4 in bore and stroke
LE5 - 3.46 Bore 3.85 Stroke

i dont see why you couldnt bore the LNF out and sleeve the block and buy oversized LE5 pistions. alittle bit of headowrk and a good tune, it could probably put down some power

 

Remember that the LNF pistons have a completely different design based around the direct injection.

 

there will never be a stroker kit for the LNF because its already at 16-1 compresson ratio, any more and the direct injection will never work, the cyl pressure will be too high, unless took out the spark plug and coverted it to diesel.

 

Totally false info here. And you can make a stroker kit with any compression ratio. It's all in the piston and combustion chamber design (volume).

 

STROKE THAT SHIIIIT!!!!!!

on a more serious note...youd be better off staying/building 2.4, building your bottom end right(forged and balanced), doing some head work(serious stuff not just valve springs), and turboing the livng hell out of it

 

and the 110 Octane.............

 

bwahahahahahaha... oh really?

 

Thats right. The best price I could find on custom pistons is $450 jobber without rings. According to GM the LE5 block is the same block ( Gen 2 ) used in the LNF with a bigger bore size. You wouldnt need to sleeve your LNF. Just find a 2.4 LE5 block. I have a 2008 LE5 longblock for future reference. No hurry here. I might get my stock turbo upgraded though. Im working on the extra head right now.

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