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Ive knoticed that there are unique differences in all of honda/acuras engings. Hp, Torque, Rev lines. So i have a question. What is the purpose of a higher reving engine? I mean ive seen some in the pro circut that rev to damb near 11,000 Rpms. Thas just insane. My K20A Redlines at 8700. So how can they go so high? and what exzactly does that do? Anyone know?

 
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well, if u know the formula for creating HP ( i dont off the top of my head) it shows that the higher u rev, the more HP u make, as long as u can continue to get the fuel and timing and all that right. A lot of cams gain power because they are a lot more accurate at the top end, adding more fuel and such at the top end to give it more power.

I believe an RX7 if taken up to 9500 RPM makes around 600 HP...( read it in an SCC a while ago).

Also, taking a D16a6 with all stock parts up to 10,000 RPM ( if it could hold it) wouldnt make power because the engine isnt designed to go up that high, u need an engine capable to make power that high, as well as, cams and internals that can make power that high for it to work.

to much writing and all i needed to say was Higher Redline = more power.

 
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Thanks. anyone know this magic formula?

 
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heres an awesome websight with all sorts of sexy automotive formula's including the HP/Torque formula

Formula Webpage

horsepower = rpm x torque / 5252

torque = 5252 x horsepower / rpm


As u can see, as ur RPM go up, your horsepower will increase AS LONG AS U have cams that still make torque. This is why cams are important, otherwise your RPM will increase, but your torque will fall faster, causing u to lose HP. This is why Vtec works so well, cause it optimizes your engine for higher RPM's and is more accurate on air/fuel mixture by opening valves longer and such, without Vtec u can still rev, u just wont make power becuase u will flood the engine with to much gas/air or lean it out, timing will be out, and ya. This is why Non-vtec cams work well, because they BUMP up the flow of air/fuel and more accurately introduce them into the engine at higher RPM. This is why most high lift cams can lose HP at lower end but get a shitload more HP at the top, because they lose the effiency at the bottem end to gain it at the top, where its needed.

 
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Okay nother question. I have found I-vtec killer cams. Bassically eleminating the I part of the vtec. Why would you want to do this?

 
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I-VTEC and VTEC Killer Cams are probably pointless for your application - They're really just used for race engines... They eliminate the VTEC lobe and rocker in favor of a set of really large lobes. I-VTEC Killers do that and I'd imagine eliminate the VTC function too.

Pros:
Lower valvetrain weight and parasitic loss
Simplified valvetrain
High RPM function

Cons:
They like to idle at about 2,000 RPM.
You have practically no low-end power
Increased wear on your valvetrain components
Complete retooling of your fuel and timing maps are necessary (standalone)

 
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high revs are good in autoX and road racing b/c you have the ability to hang in a gear longer (to possibilty continue accelerating) as your approach a corner.... compared to a car with lower revs that may have to up shift or downshift or be forced to be at a constant speed. WHat i'm trying to say is, youre reaching a corner, and you know you can add more speed entering the corner but cant b/c you would be required to upshift, that wastes time.

High revs usually mean low torque #'s..... ie: stock NA Honda VTEC cars! I have a vid of a ITR with just the VTEC lobe working and that thing really didnt have any power below 5K.... I think it's more than just formulas.... engine design (bore size, stroke length etc.......) and many things come into play.

 
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Oh yeah? ide like to check that video out. but thank, i dont know exzactly where im going with my car at this point. For now i like to drag. but im thinking eventually i want to get in to the amature SCCA racing. So im just looking at all the possibliltys.