how much power can u get with the cheap stroker?

[OSM e30]

i know that you can put the eta crank and rods from a 325e with the seta pistons from a 528e...and u get a compression ratio of 8.8 but i was wonder how much power gain will you get from that?

[OSM e30]

has anyone done it? hows it run? is it a pretty good improvement?

[JasonC]

But the stock eta compression is 9:1. Why do you want to lower it? Are you boosting it? Or are you putting it into a 2.5 block?

[OSM e30]

But the stock eta compression is 9:1. Why do you want to lower it? Are you boosting it? Or are you putting it into a 2.5 block?

oh im sorry i have a 89 325i...so it has the 2.5 in it and i wanted to make it a stroker

[moreoff]

ive got a 2.7liter, not really all that powerful imo.

im looking to get an s50 or m30

[erik325i]

put the eta crank and rods from a 325e with the seta pistons

Using an eta crank, super eta pistons, and an I head, you are basically building a super eta motor, so I would imaging the horsepower would be exactly the same as a super eta... :roll:

-Erik

[OSM e30]

Using an eta crank, super eta pistons, and an I head, you are basically building a super eta motor, so I would imaging the horsepower would be exactly the same as a super eta... :roll:

-Erik

what car was the super eta motor in?

[Jbpka06]

'88 325

[StereoInstaller1]

Using an eta crank, super eta pistons, and an I head, you are basically building a super eta motor, so I would imaging the horsepower would be exactly the same as a super eta... :roll:

-Erik

Except for "i" cam, springs, intake, TB, ECU, etc.

I have heard that the ETA/M20B23 combo would do 180 RWHP, so I expect a SETA/i should do about there too.

Luke

[JGood]

Except for "i" cam, springs, intake, TB, ECU, etc.

I have heard that the ETA/M20B23 combo would do 180 RWHP, so I expect a SETA/i should do about there too.

Luke

No way. Jordan's fully built 2.8 only put down 192rwhp with a good piggyback tune. If that eta/2.3 combo puts down 160rwhp I'd be impressed. 180hp maybe, not 180rwhp.

A SETA/i combo is simply a m20b25 with a little bit longer stroke. If that little extra stroke gives someone 30whp I'd be really really impressed. I think BMW would have made it that way from the factory if that was the case. People with fully built 3.0 strokers aren't even puting down that much. The stroke/bore of the m20 isn't the bottleneck.

[StereoInstaller1]

No way. Jordan's fully built 2.8 only put down 192rwhp with a good piggyback tune. If that eta/2.3 combo puts down 160rwhp I'd be impressed. 180hp maybe, not 180rwhp.

Agreed and agreed. Left stock, no chance of 180RWHP.

I think I might have intended to put 180Bhp.

I just wonder what headers, full exhaust and MS&S would do for one...

Luke

[digger]

People with fully built 3.0 strokers aren't even puting down that much.

A fully built ~3L stroker should make >200whp on a dynojet otherwise its not fully built. If it wasn't $150 for a few power runs i'd show you....lol. There is nothing special on Jordans car that is different to how anyone builds an engine it simply uses techniques that have been longproven. There are certain ingredients that make good power it is really pretty simple just not that cheap.

- Displacement Stroke/Bore
- Cam 270+
- Light Port work
- High Compression atleast 10:1
- Longtube headers (good ones BTB, BAV, STAHL, SS not el cheapo ones)
- free flowing exhaust
- half decent tune (custom motronic chip is fine for NA)

[MrK]

@JGOOD: BMW actually DID make a 2.7 stroker from the factory, and this engine was offered along with the full MtechII kit in some countries. We have some in Lebanon. They're rated at 185hp as opposed to the 2.5s which are 171hp here. So that's a good indication of how much power you can expect from a 'stock' 2.7i.

[rs4pro3]

Ya I estimate my budget 2.7 has about 180-190 crank hp. It feels almost the same power wise as my m30 swapped car.

[StereoInstaller1]

@JGOOD: BMW actually DID make a 2.7 stroker from the factory, and this engine was offered along with the full MtechII kit in some countries. We have some in Lebanon. They're rated at 185hp as opposed to the 2.5s which are 171hp here. So that's a good indication of how much power you can expect from a 'stock' 2.7i.

Do you think you could find a Lebanese chip for the 2.7? Maybe a set of pistons, to see if they are different than the "i" piston?

Luke