Just out of curiosity, since I'm still new to the racing world, why did chevy decide to use the 2.0 litre and supercharge that, instead of super charging the 2.4? The 2.4 is what, 171hp stock?? and The SS/SC is 206 hp stock?? We're only 30'ish hp behind. And isnt like the turbo'ed or SC 2.4's faster than the 2.0's? I dunno, I might be wrong, but if anyone can make this clear for me, it would be appreciated! Thanks guys.

 

dont know but alot of stock ss/sc dyno 215-220 whp and the 2.4 ss are about 145-150 whp stock

 

The reason they picked the 2.0L was because of shorter stroke to compliment the characteristics of the eaton. But then why not build a bigger charger and use the bigger motor.

 

I think it has something to do with emissions. I'm not positive but I thought I read something about that a long time ago. I could be completely wrong though.

 

go and read scca racing rules, the cut off for many of the lower classes for a fourced induction motor is 2.0L, so a 2.4 supercharged moves into a different class where it would be less competitive, im amost certin that the decision to use a 2.0 insted of a 2.4 was made largley for that reason. along with the realization that they could make acceptable power out of the 2.0

i may however be wrong but thats my hunch

 

yeah i bet its emissions, its always emissions

 

But hold up, didn't the LSJ get phased out because of emissions anyway? So they didn't do a very good job.

I'm assuming the LNF is better, but I don't know how much better it could possibly be.

 

the ss/sc didnt pass the NEW emissions. in 2005 when it started production it was fine, i think something changed in congress that affected the emissions standards.

I guess dodge wasnt scared to put the srt4s into a different class. way to grab it by the horns with the skittles

i also think the supercharged montes had the emission issue and thats why they discontinued that model ( i could be wrong)

 

^^ Sooo if they built up and SC'd the LE5 it would be in a higher class and thus have less strict emissions?

 

no i think that wold just put it n a different class for some racing organization. i believe the emissions rule stands for 4 cylinder cars no matter the displacement.

 

less displacement means more air into the cylinders or something along those lines...notice why ALOT of forced induction stock cars are 2.0L or lower..

its something like that..more boost or something..

 

I thought that GM needed an ecotec with a forged bottom end and they already had a 2.0 forged ecotec motor they were using in the Saab

 

I would imagine that the 2.0 is lower compression than the 2.4. A N/A engine normally has higher compression that a forced induction engine.

 

*prepares to **** off the 2.0 owners*

Meh..who cares...2.0's suck.

 

because it was less of a hassle to boost that specific motor...it doesnt have the potential a 2.4 block does..but hey gm is known for taking the easy route

 

oh boy here we go

 

it is because the 2.0 has better compression than the 2.4. that is what i think.

 

Because when the LSJ came out, there was no 2.4L engine. LSJ predates it by a couple of years (LSJ=2003, LE5=2005). Kinda hard to build a S/Ced version of the LE5 when it won't be out for 2 years.

/Thread

 

Well my money is on either its a stronger block or they had a bunch of 2.0s lyin around. Just be greatful its not a late 70- early 80's a/g body. They had almost no rime or reason to what they got and had 3 or 4 v6's and 3 or 4 v8's and weird ones i had one originally equipped with a 3.3l v6 and another one with a 307 SBO (which is garbage despite factory roller rockers)

 

the 2.4 has the stronger block...the 2.0 is just a debored version of the 2.2 with some performance inernals and a boost setup with different tuning.....not to mention the 2.4 has vvt

 

There is a lot of ignorance in this thread.

As already stated, the LSJ predates the LE5 and it was basically already in production for other GM models. Sure, the LE5 block is newer and thus, more revised and slightly stronger, and sure, it has VVT, but in the long run, those things don't make much of a difference.

Considering the fact that the LE5 crank and rods are weaker than the LSJ's, and it uses standard valves instead of the sodium filled exhaust valves the LSJ uses, and does not have the oil injectors the LSJ has, nor the larger oil pan, it really ends up becoming a wash.

Regardless which of the two you have, your best bet is to rebuild it with some components of the other for the best reliability and horsepower.

However, the LNF block is superior to both, so, again, this becomes somewhat moot. If better pistons were available and tuning was available, it wouldn't even be a question, the LNF would be superior in EVERY way.

That said, it seems to me that a 2.4L engine when boosted is going to make more torque than a 2.0L engine, and because the .4L difference is almost all stroke, this puts more demand on the rods (which are already a weak spot), it makes little sense to stick with the 2.4L crank. Torque steer and wheel hop are already a huge issue.

Thus, I'd recommend (much like MVP already has built), a combination of the LE5 shortblock and LSJ head. This can be improved by adding titanium intake valves, jesel rockers (roller followers, techinically), and a dry sump system. At that point, regardless of what block you have, the sleeves and rods are the weak components (assuming pistons are already done because they should be done FIRST on either).

 

i was not saying the LE5 is superior for having vvt...im saying its somewhat a hold back...but anyways im not sure what your referring to with the oil injectors but if your talking about the oil jets for the bottom side of the pistons the le5 has them too....the le5 also uses updated rods iirc similar to the lsj's...the only really difference is the pistons and a few other small things....as for the rods i would upgrade them anyways

 

I think we have a winner here... remember when the cobalts came out they were 2.2's and then they introduce the S/C with a 2.0 all the sudden whp was 215-220 compared to 115-120.

then the next year they introduced the SS/NA and obviously for it to be considered an SS it had to have more power, but they didnt want to supercharge so the only way to do that..... Bigger engine with better tuning. TA DA!!

if the SS came out before the SC... we would likely have SS/SC 2.4's but it didnt work that way

 

The LE5 rod is better than the L61 rod, no doubt, but a longer rod with a shorter stroke will always be stronger just for the sheer physics of things (rod angles mostly). The LE5 has provisions for the oil jets, but it was my understanding, that it doesn't actually have them. Can someone confirm this? Regardless, With the power both are capably of, the expensive part is figuring out who can put a good set of sleeves in your block and do it right.

Lack VVT is one of the reasons why the LSJ could not meet this year's emissions, but, from a performance perspective, especially on a supercharged engine, it is really not holding the engine back. NONE of the drag cars are using VVT, afterall.

 

ive heard multiple times it does have the oil jets...and i myself am almost positive it does...i should have clarified when i said the vvt holds things back...it holds things back more on a tuning level than anything...at least to the general public...sleeves shouldnt be too hard to come across