A few 2.7 i questions

[CorvallisBMW]

I dynoed my m20 2.7 with a 304 degree schrick cam, and I can tell you that power started dropping off at around 6800 rpm, so I believe a rev range that goes up to 7k rpm CAN be useable with the right cam. I had no headwork at all btw.

what kind of hp/tq numbers did you get with that setup?

[nando]

probably, with a 304 cam.. not exactly what I'd consider a "street" cam, but I guess it depends on your tastes. FWIW, I enjoy the power band of my motor, torque starts at 2500 and goes all the way to 6. But it's currently untuned and restricted by shitty exhaust and the stock intake setup (with that barn-door air meter). Soon to be rectified. :)

[Mr Deagle]

Also, the intake manifold would have ALOT to do with the power curve

[MrK]

I dynoed my m20 2.7 with a 304 degree schrick cam, and I can tell you that power started dropping off at around 6800 rpm, so I believe a rev range that goes up to 7k rpm CAN be useable with the right cam. I had no headwork at all btw.

[Mr Deagle]

sure. but trying to rev to 7k in the hope of making more power isn't worth thinking about, unless you spend a lot of time on headwork..

Or a proper cam, that has the profile designed for high rpm use

[CorvallisBMW]

good to know.

[nando]

sure. but trying to rev to 7k in the hope of making more power isn't worth thinking about, unless you spend a lot of time on headwork..

[JGood]

ummm, if you race that's pretty useable, when you can avoid a shift mid corner.

[nando]

So no 7000rpm on new stock springs?

you can probably get away with it, but it doesn't matter. you aren't going to make any useable power up there, so there's no reason to rev that high anyway.

[CorvallisBMW]

new stock springs should be good to 6500 continuously, anything above that, and i would want something stronger. which is why i got the schrick springs. im thinking maybe 7500 rpm?

So no 7000rpm on new stock springs?

[nando]

my motor runs out of breath by 6500, so yeah. not much point in me going higher than that.

[Mr Deagle]

new stock springs should be good to 6500 continuously, anything above that, and i would want something stronger. which is why i got the schrick springs. im thinking maybe 7500 rpm?

[nando]

I meant if it was floating the valves, that HD springs would help. But I really don't know if it is or not.

[Mr Deagle]

Lol, springs will definitely not make a difference in power, unless the m20 can make more power at higher rpms

[nando]

284 is the highest duration you can run on stock springs (according to schrick)

but upgraded springs are certainly reccomended. Personally, I'm using new stock springs with a schrick 284/272 and it runs fine. I'm not sure if schrick springs would make any difference in power or not.