3.1 stroker? on boost?? ..anyone?

[downforce22]

you can get 84mm custom pistons and and m54b30/ s52 crank / spacer and its a drop in fit. I've heard 85mm bore leaves too thin of walls but can't confirm.

If you are going cheapo use the m20b27 crank with eta pistons and make a 2.7 stroker with the 885 'i' head. That is the cheapest option.

[4evere30]

Thanks for the replies so far ..So do I need to bore 1mm over and get new pistons to build this? Or is that just if I want a suitable cr for boost? What are some good cheaper options for pistons if I need em?

[JCarp90]

^ lol matt

[MR 325]

hey everybody i was hoping i could get some clarification of what combination of pistons ill need to build a 3.1 l stroker m20 , also wondering how it will do with boost? im tired of the 2.5 in my car now , although the turbo is fun , i want more power down low
i already have
- Super eta head
- o-ringed "eta" block
- o-ringed "i" block
- m54 3.0 crank
- "eta" crank
- "i" pistons
- "eta" pistons
- 25lb ford injectors
- Holset he351cw
- ebay turdblo manifold
i really dont want to buy any more pistons if i dont have to , or do i ? ;D

To build a 3.1L you need go go 1mm bigger with custom pistons along with a S52 crank. You can still boost a 3.1L if you go with something along the lines of 8.5:1 up to 9:1 compression. If you want a potent NA engine go with 10:1. A good affordable and robust set of rods to use would be S52. As far as your head, if it's a Super Eta head it is the 885 casting which is good BUT you need to get either dual i valve springs or performance springs in there along with a nice cam to wake things up.

I probably want to say tired of M20. With 24v engines being cheap now, I would not even think about M20 3.1L. Even non vanos M50 is better than M20 3.1L.

Do you ever post advice that makes sense?

[einstein57]

25# injectors aint gonnah cut it. There is a local with a 3.1L turbo vert. I've been helping him sort it out. Its a high CR FTL but it has torque everywhere. Your gonnah need custom pistons to not have a high CR

I probably want to say tired of M20. With 24v engines being cheap now, I would not even think about M20 3.1L. Even non vanos M50 is better than M20 3.1L.

I'd rather have a freshly built m20 then a used tired s52.

[digger]

I probably want to say tired of M20. With 24v engines being cheap now, I would not even think about M20 3.1L. Even non vanos M50 is better than M20 3.1L.

lol,

[DesertBMW]

im tired of the 2.5 in my car now

I probably want to say tired of M20. With 24v engines being cheap now, I would not even think about M20 3.1L. Even non vanos M50 is better than M20 3.1L.

[4evere30]

hey everybody i was hoping i could get some clarification of what combination of pistons ill need to build a 3.1 l stroker m20 , also wondering how it will do with boost? im tired of the 2.5 in my car now , although the turbo is fun , i want more power down low
i already have
- Super eta head
- o-ringed "eta" block
- o-ringed "i" block
- m54 3.0 crank
- "eta" crank
- "i" pistons
- "eta" pistons
- 25lb ford injectors
- Holset he351cw
- ebay turdblo manifold
i really dont want to buy any more pistons if i dont have to , or do i ? ;D