You might ask "why not swap to 24v for ez 300hp" but I already have a ms and good setup for m20 fi so it's a bigger investment to redo all the fi stuff for m50 (ecu, headers, exhaust, etc. etc. etc.)
I just barely got my turbo m20b25 running about a month ago but I burn oil on aggressive gear shifts so I rebuilt the turbo (got it balanced at a local shop too
) but I still blow blue smoke.
Now I have the car up on jacks again to hunt for oil leaks cause she was weepin like a mother, so I'm in the process of redo'ing the oil pan gasket (gonna just say f it and drop the subframe).
ANYWAYS, I think the reason for burnt oil is leaking valve stem seals meaning another head rebuild
.
This got me thinking, why not build a 2.7i to get more displacement and lower compression for the ultimate boost experience.
I've never rebuilt an engine before but wanna get the experience.
I want to push like 350hp by the end of it reliably and *hopefully* cheaply (the turbo has shown me otherwise LOL)
TLDR
For a boosted m20, is a 2.7i an upgrade compared to 2.5?
With this next rebuild I might as well build it nice so here's what I'll do:
fairly aggressive cam (280? I know nothing about this so give me ya opinion)
Upgraded rockers, valves, and springs
O ring block
Some fancy headgasket (MLS?)
ARP studs (cant forget these, but already got em)
I want to keep it budget friendly in the end, not trying to go all out here
I also want the 2.7 to be pretty freely revving and be able to go up to 7k rpms
If I do all this, is it worth it to build a 2.7 block, crank, and rods with an "I" (2.5) head and pistons, or just keep my stock m20b25 and just upgrade the head on that?
heres a little bonus of the the bad gal sorry about 2001 quality
I just barely got my turbo m20b25 running about a month ago but I burn oil on aggressive gear shifts so I rebuilt the turbo (got it balanced at a local shop too

Now I have the car up on jacks again to hunt for oil leaks cause she was weepin like a mother, so I'm in the process of redo'ing the oil pan gasket (gonna just say f it and drop the subframe).
ANYWAYS, I think the reason for burnt oil is leaking valve stem seals meaning another head rebuild

This got me thinking, why not build a 2.7i to get more displacement and lower compression for the ultimate boost experience.
I've never rebuilt an engine before but wanna get the experience.
I want to push like 350hp by the end of it reliably and *hopefully* cheaply (the turbo has shown me otherwise LOL)
TLDR
For a boosted m20, is a 2.7i an upgrade compared to 2.5?
With this next rebuild I might as well build it nice so here's what I'll do:
fairly aggressive cam (280? I know nothing about this so give me ya opinion)
Upgraded rockers, valves, and springs
O ring block
Some fancy headgasket (MLS?)
ARP studs (cant forget these, but already got em)
I want to keep it budget friendly in the end, not trying to go all out here
I also want the 2.7 to be pretty freely revving and be able to go up to 7k rpms
If I do all this, is it worth it to build a 2.7 block, crank, and rods with an "I" (2.5) head and pistons, or just keep my stock m20b25 and just upgrade the head on that?
heres a little bonus of the the bad gal sorry about 2001 quality
Comment