Revving to 10k and broader powerband?

[DriftFasterThanGrip]

I am looking into selling one of my cars for an S-14 and SR swap.. I am curious of the possibility of revving over 10,000rpm and having a broader powerband. I was thinking internals with cams, springs and tomei solid lifers with a GT2835R and supporting mods.

I've read that the SR head flows very efficiently in the upper rpms so I'm thinking this could work out well. Input would be greatly appreciated.

[Def]

No way you'll be able to keep the engine together at 10k. Let me rephrase that, you COULD for some amount of time, but not very long, and I doubt you want to drop $10-15k on an engine build just to have to rebuild the engine/possibly replace it every few thousand miles.

I'd say 8k RPM is doable on an SR with the stuff you mentioned, but I wouldn't go much over that. Worry about upping the boost and making more torque and power rather than adding revs on a motor that really isn't cut out for that kinda stuff.

Besides, it doesn't even seem your turbo is that big, so I wouldn't worry about revving that high.

[C-Kwik]

A 10K RPM redline is possible. With a lot of mechanical work albiet. But say you do acheive it. Tryng to achieve a broad powerband is much more difficult and frankly damned near impossible. For starters, the cams will have a big impact where the power band is. For great breathing, you'll need a high lift, long duration cam to achieve good breathing up high. And with a ceiling of 10K RPM, you're going to end up taking quite a bit away from the low-end and even the midrange to achieve this. I doubt it will even idle under 2K RPM. Second, the turbo will have a limited range. If you are making a reasonable amount of power at 10K RPM, it's moving a ton of air. if you were to make 160 ft-lbs of torque at 9500 RPM, you'ld have 289 HP. That's similar to the output of a small V-8. Airflow at that RPM will also be similar to a small V-8. A turbo sized for a small 4 cylinder at a more typical RPM will be too small for one at 10K RPM. A T4 will struggle at that high an RPM. You're likely going to have to jump into T-series sized turbos to keep up. So between that and the wilder cams, you'll likely have very little to no low/midrange power. Few cars have such a broad range. The ones that do use a lot of technology to achieve it. VTEC(Honda) and variable cam timing(M3) are two ways this has been achieved. And at that Honda only took it to 9K and then ended up bringing it back down to 8K(S2000). While increasing redline is a good way to make power, it is not without compromise.

[Def]

The forces involved will go up with the square of the RPM. So basically, you CAN get a humble street engine to spin to 10k RPM, but you will most likely be rebuilding every year or so, if it will even make it that long. There just comes a point to where you've got to dump a great deal of money and parts at the engine to get that last little bit.

I'd still say the SR valvetrain won't take anywhere near that, even with solid lifters.

[k6kicker]

ca18 will do it

[IvoryJ30t]

out of the question unless you want to have a custom crank to drop the stroke, titanium rods, forged pistons, and custom cams made for you, and some really light valves, springs, solid lifters, and retainers.

not to mention the equal length manifold, huge turbo, and insane port job.

and guess what? after you have spent about $15,000 on the motor, your gonna realise that it has absolutely no power below 6k rpm, wont even idle [as said] below 1.5-2k rpm, and when the power suddenly hits, the tires are up in smoke, and you just got burned by the stock civic next to you.

the car probably wouldnt be able to go up a hill below 4k rpm.

oh yeah, and its gonna need a rebuild [seals, rings and bearings] every 20,000 miles.

[Bryants95240sx]

if you want to rev to 10000 buy a honda motor.....

[DriftFasterThanGrip]

Yea that isn't such a good idea.

[Chingon]

turbo?

or na?

[book-ends]

Why would anyone EVER run an NA car without individual throttle bodies and velocity stacks? Those items alone make your car better than 99% of vehicles on the road based on sheer "look so good it hurts" factor........

Granted, I don't have velocity stacks, but if I did..........damn.

[marshun]

i agree about the velocity stacks statement. hehe.

but if you want a broader power band you could always rebuild and boost the KA. :P the.4 liters more will make a difference in having a nice power band. unless you want nasa to make you a motor. if youre bill gates then by all means man, go for it. :P