2.7 stroker...camshaft?

[mark_i]

thoughts on the best camshaft to use when building a stroker with 2.7 M20 block, 320i head and 325i inlet/TB.

Cheers.

[mark_i]

i that recall a 323i cam gives good results....True?

[reggid]

what is the goal for the engine?

[gooner1]

Depends on your objectives, Mark.

Was told that a 323i cam would give better low end speed, which is what I wanted
but would lose out on top end figures.
Mind you that was on a 2.8 stroker.

Post what you want from your engine then people will be able to give better advice mate.
Good luck.

Reggid beat me to it, and he's your man for this.

[mark_i]

cheers guys... objective is to retain and improve on 2.7 bottom end torque...

[reggid]

a 2.8L would improve a little over a 2.7L...........all the standard cams are much of a muchness i wouldnt waste my time between them, just get a mild cam aftermarket like schrick 272 with not much more duration than stock but more lift and an adjustable cam gear to set it advanced a bit.

[mark_i]

thanks reg. are you in Sydney>?

[daimlerman]

I have tried both a stock 325 cam and a 323 cam.
325 item gave plenty of bottom end grunt,but was all done by 5000rpm,car regularly returned 36/38mpg.
323 item needs to be above 2000rpm and pulls to beyond the red line,car struggles to make 32mpg,despite a rolling road session and a bigger bore t/b.

Wish I had never sold on the 325 cam!

[mark_i]

that's good to know Malc... any problem to fit the motronic distribution rotor on the 323 cam?

[daimlerman]

that's good to know Malc... any problem to fit the motronic distribution rotor on the 323 cam?

Non at all,just bolted up as intended.
As a complete aside that may help others,I swapped the cam with the engine on the workshop floor with the head still in place.Only thing that I did was to wind the crank backwards a quarter turn after I had removed the belt to get all the pistons down the bores.

[reggid]

Bottom end torque is really nothing more than cubic inches, compression, combustion efficiency and valve timing. You want to maximize the dynamic compression.

[HairyScreech]

From MANY hours of research and simulation the shrick 272 is pretty much the best all rounder due to a decent combination of lift, duration and valve acceleration.
In most stroker combinations it works well, undeniably not the optimum but a cam you just can't go wrong with.
It will give a good top end without making the engine a dog lower down, after all most stroker builders are looking for a "big 325" feel with more power everywhere than the 2.5 rather than an NA screamer and all its faults.

[reggid]

without a good bump in CR the 272 is as much as i would use but others might like a different compromise. dont forget that catcam, dbilas, enem, kent cams all make mild cams similar to the 272 to.