Which is faster?

[dklein90]

So what combination did Alpina use to make their 2.7 so bad ass? Or did they use a different engine all together?

[nando]

they used high compression, extensive headwork, a well tuned cam, and tuned exhaust - as in, tuned to work with the cam/intake. That can make a huge difference by itself.

Basically they had the money to spend time on a dyno to come up with a combo that worked very well, instead of choosing random parts and hoping it works out.

[Wh33lhop]

I don't see what's wrong with stopping a dyno at redline.

;)

No seriously, I own an eta now. Nando we may be talking again in the reasonably distant future.

[dklein90]

Does anyone know what components Alpina used to make it work, seems like they had it figured out. Or is it a big mystery to the world?

Maybe its not possible to replicate what they did even if you know what parts they used.

[csab327i]

All I know that alpinas pistons were completely flat top,(flatter then eta pistons.The valve cut ins wer like the i pistons though.Compression ration was higher then ever and f course their headers ,computer, cam were alpina too.
Those items are ancient.

[lennon]

Damn, now I need to get my combo dynoed. m20b27 bottom end, 731 head with 325i cam and valve springs, 325i intake and TB. E electronics with custom mark d chip made for this combo.

i have basically the same setup in my car. im curious about the power but not curious enough to pay even 50 dollars for a dyno run haha. post it up if you ever dyno yours.

[whodwho]

Putting an i head on an eta does not make it a stroker.

This can't be can't be emphasized enough, thats like taking a Chevy 327 block adding a 350 crank and calling it a stroker...it is a Chevy 350 not a 327 stroker...

Adding a crank (longer of coarse) that wasn't offered for that block is a stroker.