building an M10B20. please advice

[maurim3]

Im a new member and this is my first post. im also a member of e30tech but the guys told me it would be better to post here. so...

im about to start a build of an m10b20 on a 1975 2002. What i would like to know is what would you recommend me to make a bit more powerful in NA form... what ive got now is a custom made header a 2.5 exhaust pipe and two webber 40 40... what would you think of camshaft and springs options ? where can i buy them? any other aspect i can improve ? It wont be a daily driver but its not for racing either so i would like it to act like a regular car not a race car.

thanks !

[nbristow01]

In my opinion I would use a 292 cam, a 302 is getting on the bigger side for easy street driving. say about 10:1 compression pistons. If you can afford an S14 crank you can build a stroker that will be about 2.3liter. Getting the rotating mass balanced is a huge bonus on any engine. Tons of info on this subject in this forum. Ireland Engineering has tons of the performance stuff. their site is www.bmw2002 dot com

[maurim3]

thanks ill look into ireland engineering.

[roadhog0]

E12 Head, piano top pistons of 9.5:1 or greater compression, 292 cam, heavy duty rockers, rocker arm locks, upgraded radiator (not part of the motor I know but a good addition), also a silicon hose set while your at it. Thats my .02, hope you enjoy your 2002!

[maurim3]

Honestly all i would like to do besides the carbs and headers would be the camshaft and springs. i was looking at ireland engineering 292 camshaft and springs. is that a good improvement ?? whats the stock duration on the stock cam? and maybe some higher compression pistons but that would be it. I just dont want to over do it.

[Anschauer]

Check out Top End Performance - lots of goodies there as well

[TobyB]

For a streetable car,

you can actually add a bit more cam than the 292.

For my money, an aggressive regrind's the best way to go,

since you don't want a ton of lift. Delta Cams will get you

in the ballpark for not much more than tax and shipping on a Schrick.

With the 40's, I'd run 30 or 32 chokes.

2 1/2 is huge for a street motor- what primaries on your header?

And finally, how fast do you want to spin it?

That will really determine what kind of cam/valvetrain you'll want/need

t

[maurim3]

i just want to take advantage of the bigger carbs thats it.. i just want to go to stock rpms.