Does anyone know that has a fully built 2.4 motor (LD9 or the Ecotec), of what the highest rev posible that would be the limit to these motors?
I was doing some math and was figuring on building my motor to rev to about 7500.... if that was possible. If anyone would let me know I would a preciate it.
Thanks,
Craz24davin
The point of a high revving engine isn't just to rev high, there is no point in revving any higher if you aren't making any more power. Build the engine for strong valve train parts and a balanced rotating assembly, then put it on the dyno and increase the rev limiter until it stops making power. That may be at 7000 RPM or 8000 RPM, depends on how its built.
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That really didn't answer my question... I knew all that already.
My question is what i want to know how high is the highest that anyone has achieved by building their own motor before i decide what size displacement i want to go with ( 2.0 - 2.4).
Ive done some math according to the book Maximum Boost ( by Corky Bell) and have determined that a 2.4L out flows a 2.0L reving at 7500 RPM vs. a 9000 RPM. Get my drift? I would rather know the limits of an engine before I were to built it, and waist my money on that engine which couldn't make more power effeciently with the right turbo. $10k or more is a lot of money to spend in the wrong direction by picking the wrong parts.
Not to post jack, but what 2.0L?
with the right valve train , and cam specs , it would be possible
but there is no sense in a 7500 redline , when all the cams are made for under 6500
The only one that has a build 2.4 is Karo. He used W41 cams and Ho cams. The W41 cams gave him some weird number. The Ho cams were perfect. So the highest achieved right now is around 6800rpm for the rev limiter. The Ho cams make power at 6200rpm.
If you could use the 2.3 cams and get good numbers out of them, you could rev around 9000rpm but you'd have to us the 2.3 oil pump for sure and I don't think the crank and the bearings would be reliable at that point. Solid lifters are a must and dual valves springs are the first thing to buy.
You can get 2.3 cams that make power between 6200 and 9000rpm.
Gilles
2.3 Ho
Shifted wrote:He probably means a 2.0L eco, but doesn't know that its pretty much impossible to get into a J-body.
Do you even know what the 2.0 eco is? whos to say that its impossible to swap an ecotec motor for the LD9? isn't the '02 cavalier with the eco and the Z24(LD9)? i wouldn't say thats impossible.
Yeah im sure the 2.0L engine your thinking about is the one that's in the SS/SC Cobalt, and that it might be completely different with the mounting points than a Jbody. But that doesn't mean that i might take the original platform of the 2.2L and either stroke it or destroke it for my needs....You never know!!!!
Yes i am going to swap the LD9 for the Eco, my whole post is to see what the numbers of the 2.4 (bore and stroke) are the limits for reving high vs. the what I see the 2.0 has.
As for cams... I was figureing on a custom grind. Finding the right numbers is part of my research right now. I wanted to compair numbers on every part of the engine to see what kind of monster I could build.
Mfk-223 wrote:The only one that has a build 2.4 is Karo. He used W41 cams and Ho cams. The W41 cams gave him some weird number. The Ho cams were perfect. So the highest achieved right now is around 6800rpm for the rev limiter. The Ho cams make power at 6200rpm.
Actually, the REDLINE is 7200.
Peak power is 6900ish.
CraZ-24 wrote:That really didn't answer my question... I knew all that already.
My question is what i want to know how high is the highest that anyone has achieved by building their own motor before i decide what size displacement i want to go with ( 2.0 - 2.4).
Ive done some math according to the book Maximum Boost ( by Corky Bell) and have determined that a 2.4L out flows a 2.0L reving at 7500 RPM vs. a 9000 RPM. Get my drift? I would rather know the limits of an engine before I were to built it, and waist my money on that engine which couldn't make more power effeciently with the right turbo. $10k or more is a lot of money to spend in the wrong direction by picking the wrong parts.
Your math means nothing.
Here's another revelation for you... a 6.9L can flow more @ 2600rpm than a 2.4L at 7000 rpm. Notice a pattern? More displacement = more airflow at lower rpm... given they are built for 100% volumetric efficiency. That in itself means nothing.
How high can a 2.4 rev?
Answer= What rods, pistons, crank, oil pump, head(work), valves, springs, retainers, cams, lifters, etc. is it running?
99.999% of the cars with 2.4s on this site have never exceeded 6400rpm under its own power (downshift to 1st at 85mph doesn't count). So no one can answer except for me, the one person who has sucessfully and reliably done it to my knowledge.
If you can truly understand the theories presented in Maximum Boost and are capable of accurately figuring out custom cams specs, you should find figuring out rev capabilities pretty easy.
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a 6.9L can flow more @ 2600rpm than a 2.4L at 7000 rpm. Notice a pattern? More displacement = more airflow at lower rpm.
THATS what i was waiting for lol ....why not aim for more power at a lower rpm than trying to rev the thing to high hell
I knew you would correct me Todd. I didn't know the Ho cams make power at 6900rpm on the 2.4. You're the only one that could tell us.
Todd, do you have any .bin file and description file for the 2.3 ecm? I'd like to get a set of W41 hot cams 2. Also, do you know how high they make power? It's the .430" lift and 222° duration cams.
Gilles
2.3 Ho
scott (section8cav) wrote:Quote:
a 6.9L can flow more @ 2600rpm than a 2.4L at 7000 rpm. Notice a pattern? More displacement = more airflow at lower rpm.
THATS what i was waiting for lol ....why not aim for more power at a lower rpm than trying to rev the thing to high hell
By going with the stroker 2.4 motor, I will be getting a lot more power at the lower rpm.
You're compairing V-8s with I-4..... two completely different worlds... And Math Is Everything! Didn't your high school algebra teacher say you would use math everyday, mine sure did!
Why Im debating weithor to go with the 2.0 or the 2.4 is coming from my cousin. He has an Evo VIII and is trying to decide to stroke or leave the motor as is (2.0). There are 3 known evos that have put down 900+ HP (all shop cars) and one just so happens to be a stroked 2.3L 4G63 motor. I've seen the dyno video on streetfire, clearly showing him taking that engine over 8000 RPM! That made me curious to see what the stroked Ecotecs can do.
http://videos.streetfire.net/search/ams+evo/0/1C62EABE-28F9-40D0-A665-86DFEB500B3E.htm
If this vid doesn't float your boat than i don't know what will....
