Camshaft options for M30.

[totheredline]

I was wondering if I could get some input on what cam to choose for my build. It is an M30B34 ported to a B35 manifold, shmiedmann headers, B35 intake valves, 39mm exhaust valves and B35 pistons. So itll have a little under 10:1 compression. The car will run on an MS1 ecu.

Ive been looking into the IE 292 regrind as they seem to be the cheapest option. has anybody else run an aggressive cam profile in an m30??

[wallyg]

I would like to know how the regrind cams worm aswell

[totheredline]

Ended up going with a dblias 297/297, B35 valve springs, IE HD rockers, IE rocker locks and VAC retainers.

Its a pretty damn aggressive cam.

[bmw444]

Camshaft

Hi
How well did the schmeidmann headers fit. Do you have a photo? Also what sort of power/torque do you think you got out of the mods listed?
Chris

[totheredline]

Not sure how the headers are going to fit but apparently they've been used in e30 m30 swaps before.
Hoping I can get about 220 to the wheels. I will be running a standalone ecu without an afm and I will also be deleting AC and power steering so I should pick pick some horses.

I've seen dyno sheets of mildly nodded m30b35s putting down 220hp so I should easily be able to meet my goal

[Bearmw]

Keep in mind the stock B35 makes max torque around 4100 RPM and max power around 5650 or so. In my opinion it makes the most sense to accentuate what these engines are already good at : making lots of mid-range torque. My 10.5 to 1 B35 has a cam designed to work with it and the max power range is now extended to a whopping 6100 RPM. I will post the specs of my cam later. I have not talked with anyone who has run the dbilas cam but know a lot of people are down on their m20 itb setup that used to be the rage years ago. What are your goals for the car as far as driveability is concerned? If max power is the goal, then you need more than a c.r. of under 10. If you intend to turbo it on the other hand then a c.r. of under 10 makes sense.

[totheredline]

unfortunately Im a 19 y/o college kid and although I make very good money for my age, school, bills, and trying to save money in an IRA leaves me with little to spend on my E30. At the same time I don't want to cut corners. This will be my 4rd complete engine build but Im still learning.

I'm not too concerned about daily driveability. I have a turbo Toyota 4x4 and an 81 Honda civic to cover daily duties. This will be a Saturday night hoon mobile, backroad blaster and autocross car. I should be able to get the weight down to around 2500 lbs or less. The last e30 I built was a totally stripped out 318is that weighed right around 2100 lbs. This weight reduction helped a lot with my cammed m42's lack of torque.

I plan to rev the m30 out to 6800-7000 RPM. Not sure if Ill be making power all the way to redline however. Im hoping the port work, lack of AFM, bigger valves, cam, ect will allow it to breathe that high. The bottom end will also be balanced and lightened to decrease rotational mass.

As far as compression ratio.... All I can really afford to work with are the B35 pistons I have. Ive done a lot of research and haven't gotten a straightforward answer about B35 pistons and a B34 head. Some have told me Ill see valve to piston contact, while others have said it works fine and gives you a compression ratio of 9.7 to 1. I'm a little concerned about the static compression ratio being a little too low for the duration of the cam I chose. That being said. Im going to look in to getting the head and block skimmed and using a thin headgasket.


If you have the time I would really appreciate some info on your engine. Parts used, ect

[Bearmw]

With your goals I would seriously consider some nitrous. Be a pioneer. I've posted in a few m30 threads with my engine details but got a lot of my m30 knowledge from a bunch of guys on mye28. Some real good info out there.

BTW what trans, diff ratio, tire size, and total vehicle weight would you want?

These are good things to decide before going further on the motor I think, no?

[totheredline]

I agree with you.

I'll be using a 3.73 LSD

Style 4 wheels (because they look like alpina wheels.) With 225/50/15 azenis rt615ks

No a.c.,p.s. ,rear seat, sound deadening, abs, carpet, headliner, central locking, rear speakers, etc.

I'll leave the center consoles and glovebox ect

Should be very light weight when finished.

[CorvallisBMW]

I think you will find the 3.73 to be much too short for the m30. I would start with a 3.25, then if you really want, move up to a 3.46. Good luck!

[totheredline]

I actually have a 3.15 torsen in my car now.

[Bearmw]

3.25 here also but have a 3.46 in the wings to compare.

[totheredline]

I like the 3.15 in my eta right now. Compliments the linear torque curve very nicely