2.4L Stroker Questions... Expert advice needed!

[Daedalus]

I am going to be building an all motor engine over the next month or two. I have a couple questions and no one seems to have a definative answer for me. After reading this post: http://www.dsmtuners.com/forums/showthread.php?t=100677&highlight=2.1+Liter

We thought this would be the perfect setup for me. According to that article I could bolt a G4CS bottom end to a 4G63 head and it is SUPPOSED to (accoring to the other post) result in a 2.4L displacement with 11:1 compression. If I were going turbo, this would be a problem, but for an all motor engine 11:1 is ideal enough for all intents and purposes. The setup would have a fully ported/polishes head, 1mm o.s. valves, full intake exhaust, e-manage, 390cc, yada yada yada...

The questions are this:

(1) I have an old school Magnus Motorsports Intake Manifold. Will I be flowing enough air to make any use of this manifold or should I keep it off and just port a turbo manifold to swap on?

(2) G4CS blocks are rare around town. Can a 4G64 (7 bolt) be converted to bolt up to a 6-bolt?

(3) Is the 11:1 compression that guy talks about in his post B.S.? Do you think it would be different?

I know i'm forgetting something... but its late and i'm tired. I appreciate all of your help. No one else seems to have any answers for me as i'm way off the map and in unchartered territory with my new project.

Thanks again!

 

[bigjangin]

so you want to create a high revving NA 2.4L? Let me get this question out of the way...Why? It would be way way way easier to make power with a 2.0 turbo, even easier with a 2.4 turbo, so why go NA. NA is hard.

Now, you might have your reasons so I'll answer the questions as best as I can

1) Every intake manifold(hell almost every part) for our cars was made with boost in mind and not NA power. This would be good to keep in mind, as I don't know if it would work optimally in your NA setup.

2) Dont really understand this question? You cant convert a 4g64 to a 6 bolt. Anyways find a g64b(85-87 galants) or g4cs (89-91 hyundai sonatas). If none of the junkyards in your area have hyundais, try out of state to somewhere that might ship them. I can get them locally for 75-150, but shipping is a b*tch

3) I cant confirm the 11:1 ratio, but I have no reason to believe thats its incorrect. Its gonna be too high for boost.

Are you planning on custom cams? Custom headers?

 

[Daedalus]

Yea I know NA is hard. But thats part of the reason I wanted to try it. Keep in mind i'm not shooting for 300hp, or even 250hp. The car is going to be a street/autocross car and probably will never see an ounce of drag strip use. Quite frankly it would be much cheaper to for me to stay NA then go to turbo (dont think i didnt think about it). A turbo setup would cost much more. I can get a 2.4 11:1 compression engine with my old head laying around and 300 bucks for the entire G4CS engine. All the rest isnt needed but I wanted to give it a try.

Punishment racing is developing a tubular header for the car currently (http://www.punishmentracing-na.com)

Yes it will be running HKS 264's (currently is) and the stock turbo exhaust cam. There are no gains to be had on the exhaust side of the engine when your NA.

Thank you for your responses.

 

[Maglin]

N/A motors see hugh gains from proper Cam timings and int/ext overlap. If your autocrossing it and going N/A then you would probably be staying in the upper RPM band and would get some good gains from overlap. Not sure on how much but on a SB V8 you would be useing like 112-114 degrees over overlap. You loose a lot of bottom end but the gains on the top end are what you're looking for. So at least get some adjustable cam gears and play around with your exhaust cam timings.

 

[Daedalus]

Fidanza's are allready in the mail to replace the shitty OBX ones on there right now.

That manifold has a 2l plenum on it so its huge. Its on my car right now and needless to say the damn thing is robbing all of my power and torque.

Look at the massive thing...

Any other suggestions or thoughts?

 

[bigjangin]

I would call up comp or crower and talk to one of the guys about getting a custom cam for your application. A turbo cam is much different from an NA cam. Cams are very important in an NA setup and will probably help you make power more than any other single item. I think you could hit around 230whp or more, it would be really cool to see. Keep us updated.