Hey guys i know not many people troll here but i dont really know where else to go for info on my 2002. What kind of cam should i use in conjunction with Weber 45mm DCOE dual sidedraft's?

A 284 would be a good choice without knowing more about your motor... Check out www.bmw2002faq.com for lot's of good info!

A 284 would be a good choice without knowing more about your motor... Check out www.bmw2002faq.com for lot's of good info!

With 45's I would go with at least a 292. When I built my engine I was told not to use less than a 300 with the 45's.

With 45's I would go with at least a 292. When I built my engine I was told not to use less than a 300 with the 45's.

Once you get up into the 292 area you have to start worrying about piston to valve clearance. If your head has ever been decked your probably going to have to bust out the dremel and modify the pistons. Get into the 300 plus range and then your talking about even more mods with the rocker/eccentric clearance/lash caps, etc... Then you have to think about other considerations like compression ratios! A 300+ cam is not a good choice with a motor that has less than 10:1 comp. A 300+ cam will also show noticeable effects while idling…

On a total rebuild where you can build the motor around the components, i.e. a perfect world, a 304 cam might be perfect with dual 45's and high comp pistons. Throwing a 304 cam into an unknown motor and with limited knowledge of what the owner's budget is or how "deep" they want to get into the motor it's really good advice in my book without at least warning of all the mods and sacrifices that need to be made. I suppose it’s more a matter of how many modifications you are willing to make to gain performance. A 288 cam would more than likely slide right in but is really suited for dual 40’s or a big single downdraft. A 292 would work well with dual 45’s and require only minor fitting depending on your head condition. A 304 will give you even better performance but with the sacrifice of having to do a lot more work to get it to work and of course taking the assumption that your compression is good enough to make the equation work.

I have had many conversations with Steve at TEP (top end performance www.racetep.com) and Jeff/Jeremy at Ireland (www.bmw2002.com) concerning many of my m10 motors and I would recommend giving them a call and chatting for a while before making any purchases. Those guys have probably forgotten more about m10 motors than I will ever know.

40dcoe and 45dcoe can be tuned for any motor, and they can be tuned to exactly thesame specs. The only difference betweenthose two carbs is the sizes of the chokes thatthey can use. Most 2002 will use the chokes thatoverlap both 40s and 45s so either carb will work. Youneed to let us know whatpistonsyou have and whatdo you plan on doing with the car. Carbs can be tuned for all of these configurations.

steve k.