M50 vs M20.. for boost. whats your opinion?

[Cyrix2k]

I'd be scared to have a built aluminum block for boost, but I just want to know if there is plus side to it assuming everything is 100% on point.
I can't think of anything besides weight and heat dissipation opposed to iron.

I *think* alusil actually wears better than the iron block bores too. I'll probably wind up boosting my 540 at some point which has an aluminum block, but it will be low boost. I'm not against boosted aluminum blocks, just high hp aluminum blocks.

[einstein57]

So you guys are saying 335i motors are crap?

[ak-]

I will look into the m52, but i dont like the sound of it being a obd2 n having to put it back to 1:( although... if it has forged internals, then there would be no point of building it! Which that is a plus on the $$$$ side:)
Thanks you guys for the info.

You don't have to. There are obd2 tuning solutions already.
Go bathe in bfc's forced induction section.

[ak-]

isn't that an aluminum block? I wouldn't use it for boost. Some of the M52s are aluminum too (Z3 & all world market M52s?) and I would avoid those too.

I'd be scared to have a built aluminum block for boost, but I just want to know if there is plus side to it assuming everything is 100% on point.
I can't think of anything besides weight and heat dissipation opposed to iron.

[Cyrix2k]

M52tu any good? I hear good things about boring out the stock holes and using supra hardware.

isn't that an aluminum block? I wouldn't use it for boost. Some of the M52s are aluminum too (Z3 & all world market M52s?) and I would avoid those too.

[einstein57]

M52tu any good? I hear good things about boring out the stock holes and using supra hardware.

[MT325is]

I will look into the m52, but i dont like the sound of it being a obd2 n having to put it back to 1:( although... if it has forged internals, then there would be no point of building it! Which that is a plus on the $$$$ side:)
Thanks you guys for the info.

[TheTacoMan]

m20 is a capable motor, however it sounds like the m52 and m30s can be absolute monsters.

[F34R]

school zones

Snorted soda, thanks lol.

Another one for m52+boost. Or a basic m30b35+boost is a total monster on stock internals/MLS ARP. Just see what Good & Tight does with an M30. Tons cheaper than a m52 to get and reseal.

[ToPLeSS(e30)FeinD]

Because of you're going to re-build with forged parts..

M20M2? + PERFECT tune + BOOST = BIG WIN

You'll never feel that you want more than M20!

exactly what i was going to say.. boosted m20b2x>5 for the win

What's the benefit of an aluminum block vs. iron on boost?
heat dissipation?

THIS. any one know if there is a real difference?

[MT325is]

school zones

:rofl:
Hahaha you win!

[MF DOOM]

school zones

[MT325is]

the m54 is terrible for beating on. The block needs to be time-serted for studs and the oil pumps have a habit of shearing when the motor sees extended high rpm use. The M52 is the way to go - it has forged internals and will take a LOT of boost. Card counter was making over 600 whp before his stock bottom end blew up at around 680 whp iirc. The M52 is the best stock NA BMW I6 for boost.

"head gasket and studs and boost away.Ran 25-30psi almost 2 years.Was running 635 whp. We tried the 700whp mark but the rods could not take it."

This is awesome!!! That is kinda umm insane!
But honestly where can you drive around with 630 hp?! Lol. That's so much! I'm not saying it won't be the funnest thing you have driven.. But other then a strip where can you hit full boost?

[Cyrix2k]

You say that now. I'd think an m54 would be a great motor. Has s52 crank and more wall thickness IIRC. Plus aluminum block.

the m54 is terrible for beating on. The block needs to be time-serted for studs and the oil pumps have a habit of shearing when the motor sees extended high rpm use. The M52 is the way to go - it has forged internals and will take a LOT of boost. Card counter was making over 600 whp before his stock bottom end blew up at around 680 whp iirc. The M52 is the best stock NA BMW I6 for boost.

"head gasket and studs and boost away.Ran 25-30psi almost 2 years.Was running 635 whp. We tried the 700whp mark but the rods could not take it."

[LowR3V'in]

I think now a days with the flood of m50s everywhere it would be best to use them.
m20 imo if you're REEALLY doing it on a budget. Either way 300hp+ is a given.