M42 budget rebuild - Upgrades to bottom end?

[trackjunkie21]

I don't have to write BMW to figure out why they decided to reduce manufacturing costs by installing cast parts. Look at the numbers man. m44 is +4lb/ft of torque over the m42, and that's about it. Was it about performance and longevity or profits??

that's when it's obd2. obd1 conversion yields power. If you really wanna go off the walls, locate an m47 crank.

[io_RobbieRodgers]

OP, I'm going through this exact operation right now. So far I know we need new sets of rod/main bearings, and new rod bolts. Still trying to figure out if the main cap bolts can be reused. Also figuring out if it's cheaper to buy the gaskets individually or as a package. I hear that there's an updated crank seal that's of benefit to use. Might even do the piston rings while I'm at it if I can afford them...

[Martin C.]

Thanks Guys. I really appreciate the input regarding upgraded bearings, and updated relief valves. I can see that having a lot of money would probably help me in getting forged pistons, problem is: I do not have the extra cash right now so I am sticking to simple upgrades.

I am not sure but thinking about replacing the oil pump too.

And I know buying the whole gasket set is more cost effective ("cheaper" if you must) than piece meal.

Happy Thanksgiving!

[Martin C.]

OP, I'm going through this exact operation right now. So far I know we need new sets of rod/main bearings, and new rod bolts. Still trying to figure out if the main cap bolts can be reused. Also figuring out if it's cheaper to buy the gaskets individually or as a package. I hear that there's an updated crank seal that's of benefit to use. Might even do the piston rings while I'm at it if I can afford them...

Sopunds like you are going deeped into the build than I am. My main problem was the head so I am getting that refreshen. The bottom end was fine for the most part. GL and let us know how it turns out.