engine and drivetrain Today's street engine.

[hcetretsam]

Building an engine for a 2002, years ago the e12 head, 9.5:1 compression 40 mm webers and 292 cam was considered streetable. I will be using standalone iginition and fuel injection. Now the dilema.

I already have:

schrick 304, titanium valve retainers, rocker locks, double valve springs

both an e12 and an e21 head (which to use?)

e21 2.0 bottom end and block.

I would like 160-170hp and still be streetable with 7.5k rev limit.

Max compression for 93 pump gas.

Max timing to use?

[bmw1602.com]

timing best adjusted on the dyno, You didn't say what carbs.....but i'd guess the combo is not going to get you the power you posted.

but the specs look like everythign should work. 292 is totally streetable.

[hcetretsam]

I will be using standalone iginition and fuel injection.

What I am saying is, with a 304 cam and the above fuel/ignition setup, should I use the e12 or e21 head? What pistons should I use for a street motor

[mossyboy6]

What I am saying is, with a 304 cam and the above fuel/ignition setup, should I use the e12 or e21 head? What pistons should I use for a street motor

The e21 head will not allow piano top pistons, only "dome top" which are very hard to find.

I would go for the e12 with 9.5 pianos.

But I am not sure if they will clear the 304.

[1972fritz]

wanna sell your 40s? adampybas at yahoo dot com

[visionaut]

I run a 304 with 9.5 pianos in a E12 and have no clearance issues.

But the critical factor in necessary clearance is deck height. Stock cylinder head 'full' deck thickness = 5.078 or greater. The minimum recommended deck height for piano tops & 292/304 Schrick with stock thickness head gasket = 5.065. Or you'll need a thicker head gasket - Cometic comes in greater thicknesses.

HTH,

Tom

[brianstj]

Ireland's new Mahle reproduction pistons for the E12 head have reliefs cut for high lift cams. I think the standard is 9.5:1, but I believe you can also do custom compression ratio.

FWIW I am running them with a 292 cam - no issues.