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Hi! I just registered :) Just want to seek your help out guys. I'm from the Philippines and my ride is an A31 Cefiro with an RB24S engine ( 2.4L in-line 6 carbed engine). Currently, the engine is stock with 160 hp. I want to increase the hp a bit. Presently, I'm doing the standard I/H/E mods. Problem is, there are no aftermarket goodies available for this engine, so I'm planning to have this custom fabricated. Right now, we're fabricating an intake that would fit a cone-type filter in place of the stock. Any more ideas guys on how can I improve the engine without resorting to engine swap to an RB20DET ? Thanks :)
 

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Hmm, had my intake fabricated :) Just to give info, the RB24 is the carbureted version of the famed RB engines. Some say it is a downgraded Skyline engine, or it's a carbureted Skyline engine, hehe :( I'm having a difficult time increasing the power since there are no bolt-on upgrades available. I'm having custom headers and exhaust fabricated for it. Well, the engine is fine by the way, good acceleration, good speed :) I've talked to our specialists here and they say they can increase HP by going tri-side (3 carbs). Another option is to do port and polishing of the the cylinder heads, lighten the flywheel and upgrade the pistons and do re-boring. I'd like to ask the people there in US what their opinion is regarding this. I know you don't have much experience in carbureted engines because most cars there are fuel injected. Well, just asking for opinions so that I could have options in improving HP :) Forced induction is out because I don't know if turboing a carbureted engine is possible. Thanks :)
 

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In the way of upgrades for your engine... Higher CFM Carbs like Holly carbs. Just set the A/F ratio more rich and you'll get some bang for your buck, BTW this is the cheapest upgrade. Or if you wanted to spend a little bit of money, go for the RB25DE head... could have closer to 200/220hp just with the stock ECU. Say, what's the redline on your car? I've heard that the RB24S is very rev-happy.
 
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