Mr. B's House of Hoopties

[AWDBOB]

I’m a man of your word, but I’m no cheapass… standard stroking fee of tree fiddy

hahaha this is the support r3v needs!

yeah sucks that is NLA

might keep it simple and do a 2.7 and deck the block (eta crnak, rods, i pistons -2mm deck)

plus itbs, should be making pretty solid power

I feel like I can do that for relatively cheap. I got my buddy who has a 60k mile eta long block he was going to give me for free.

hmmmmmmmmmmmmm

Idk what are good setups nowadays when going with an s52 crank

I bet if you called Mahle they'd have that 2.9l piston data on file.

I have one of the 2.7s you mentioned in hoopty now with stock bore/ i pistons, shaved deck, eta crank/rods, 272 cam. It feels great in the car, isn't exactly a power house. I bet it'd make more power with a fresh bore and 84.5mm pistons (11251714810).

No one makes a good off the shelf piston for use with s52 crank so you have to get a custom set. Isn't the end of the world, top end performance does them often, but then you're spending $1500 on a set of pistons.

I still think the best bang for the buck is the 2.7 with the 84.5mm pistons, and spend some coin on headwork/ITBs/header.

This my current 2.7 272 cam vs stock bottom end m20b25 with a 272 cam. Same peak power, 2.7 has the torques

Untitled by bimmertown, on Flickr

[MrBurgundy]

ITBs are 100 percent going to be involved along with head work, so I know I'm going to get my power on top from that, along with a long duration cam

The stroking off part is mostly going to be for the hope that my bottom end isn't completely neutered by the cam

What dyno was that? that's not bad tho at all for a budget stroker with no head work outside of a cam

I think with a hotter cam, ITBs, euro 9.7:1 b25 pistons, decked eta block and some head work, I think getting ~200whp is very achievable for 91 octane and keeping it safe.

Hopefully a 288 will still street alright. Hoping that will help push that peak power out cuz I really only rip the car so I need all the beans up top.

[2mAn]

I think with a hotter cam, ITBs, euro 9.7:1 b25 pistons, decked eta block and some head work, I think getting ~200whp is very achievable for 91 octane and keeping it safe.

I cant wait until my car dynos 3 more whp than yours without ITBs... and also shows you its dirty butt when we drag race

[MrBurgundy]

bro my stock b25 would have smoked u



your eta bottom end with a non decked block probably dynos at 139hp with the 885 head which probably has a seta cam and not the i cam

unless you're holding out info u lil slut


oh wait is this the 'new' engine?

Either way, you cannot make more HP than a car with a cam, headwork and ITBs even at a 3.xL

HP comes from flow and that intake with stockish head aint gonna make anything past 170-190whp

[2mAn]

your M20 tried to kill itself because it was sick of your sh!t... mine has been loving its revived life, running slow-ass times at Buttonwillow without any real issue haha

But dont worry, my junkyard 2.7i will be dyno'd and we will see all of its whp.

[MrBurgundy]

Cast rockers are all on borrowed time lol even the BMW ones.

Funny cuz I reused a nice set of old BMW rockers when I put this head together instead of febi

When you gonna dyno it

[AWDBOB]

ITBs are 100 percent going to be involved along with head work, so I know I'm going to get my power on top from that, along with a long duration cam

The stroking off part is mostly going to be for the hope that my bottom end isn't completely neutered by the cam

What dyno was that? that's not bad tho at all for a budget stroker with no head work outside of a cam

I think with a hotter cam, ITBs, euro 9.7:1 b25 pistons, decked eta block and some head work, I think getting ~200whp is very achievable for 91 octane and keeping it safe.

Hopefully a 288 will still street alright. Hoping that will help push that peak power out cuz I really only rip the car so I need all the beans up top.

It's a dynojet roller with open source software- my buddies 3L m20 car ran on our local normal dynojet and that dyno in the same configuration, and it did 10whp more on the local dynojet w similar conditions. I suspect this car would do ~165 on a normal dynojet.

Chasing dyno numbers on an m20 can lead to sadness, fair warning. If you're doing quality headwork and ITBs I see no reason why you wouldn't hit 200 though

On my old 3.1 with no ITBs and a 284/280 it still fell over up top, should've done a 288 methinks

Damn 2hunnitman making bold claims out here

[MrBurgundy]

The intake really chokes this head

if you went ITB with the 3.1 it would have made some insane power and with the right cam, it would breathe so well up top.

I'm pretty sure a b25 block with euro pistons, 288 cam, itbs will get pretty fuckin close to 200whp. but I'm sure you're gonna be at less than 100 ft lbs at 3500 rpm lol

The stroking part (not the gay kind) is really just gonna give you a violent torque curve when using stock intakes and stockish heads. when you add the good stuff on top is when you start to make really nice power.

A good 2.9l with ITBs, nice heads and a cam will easily do 220-230.

I'm pretty confident a 2.7 with the 9.7:1 plus all the other goodies will give me a result I'd be more than happy with.

long live the m20

[MrBurgundy]

anyone have any experience with IE HD aluminum rockers?

might spend the extra $$$ for the steel HD rockers from bimmer heads

[2mAn]

The stroking part (not the gay kind) is really just gonna give you a violent torque curve

but what about the gay kind of stroking??

long live the m20

[2mAn]

1-month later bump...

Wheres my money punk!?

[McGyver]

Wait, the mahle 2.9 stroker pistons are NLA?!?!

[2mAn]

Wait, the mahle 2.9 stroker pistons are NLA?!?!

I had my eye on a set that Bimmerheads were selling last year. It was their last set… for the low price of $1500… someone else bought them before I could justify the purchase price.

[McGyver]

I had my eye on a set that Bimmerheads were selling last year. It was their last set… for the low price of $1500… someone else bought them before I could justify the purchase price.

Damn! Weren't they something like $900 usually?

A couple of years ago I thought about building an m30 with the intent to get a power bump (stroke, compression, etc.) but the lack of aftermarket pistons meant the only option was to go custom, and I didn't think that made sense on an NA engine. Can't you get custom forged m20 pistons for less than $1500?

[AWDBOB]

Damn! Weren't they something like $900 usually?

A couple of years ago I thought about building an m30 with the intent to get a power bump (stroke, compression, etc.) but the lack of aftermarket pistons meant the only option was to go custom, and I didn't think that made sense on an NA engine. Can't you get custom forged m20 pistons for less than $1500?

The ultimate street 2.9 pistons were ~$1300. They've always sold 84.5mm mahle m20 pistons (11251714810) for around $900 which could be what you're thinking of.

Custom pistons through topendperformance start at 1595 now which seems high I'm sure if you designed a piston and went straight to JE it'd be much cheaper. JE has the dome profiles on hand for the 885 chamber. I also suspect you could convince Mahle to make you some version of the 2.9 piston if you spoke to the right person.