325 turbo / 327 turbo engine spec
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shane281189
- E30 Zone Newbie
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- Joined: Sat Apr 07, 2012 11:00 pm
Hi can anyone confirm for a turbod 327i I need a "e" 325e engine and just put the 325i 885 head on ? Going to rebuild engine but want to make sure this is right before ordering parts . Any help or links to the right specification ? Want to start this weekend but need confirmation
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Grrrmachine
- E30 Zone Wiki / Team Member
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- Joined: Sat Feb 09, 2008 11:00 pm
- Location: Warsaw, Poland
Have a read of this, it outlines three potential solutions. Not sure which are strong enough for Turbo applications though.
http://www.e30zone.net/e30zonewiki/inde ... ding_a_2.7
http://www.e30zone.net/e30zonewiki/inde ... ding_a_2.7
'89 325i Touring | Touring Resto Thread | In-Dash Screen install
Hey fella. I'm on the same band wagon... My setup will be 325i low comp pistons. Eta crank and rods all chucked in to a freshly bored out m20b20 block. Personally I'm going for a bored out block is so the ring gap is as good as possible to minimise blow by on a turbo application. Going 2.7 will require to have the top of the block get machined down. Be it the eta block. A 325i block. Or a 320i block. All would need decking.
Then whack on a 325i head.... But! A standard cam will not cut it! You'll need to spend £350ish on a 272 cam at least. As the stroke of your eta setup will want the valves to be open for a tad longer. If you don't buy a cam, you may as well turbo a 325i lump. (My opinion though that is!)
Vernier cam pulley to take up the slack by your machining of the block, and you'd be good to go.
In essence, your getting a larger stroke with the same compression ratio so off boost you'd have 2.7 torque and having increased stroke a little earlier. (250rpm???) spool up time is sooner.
Then whack on a 325i head.... But! A standard cam will not cut it! You'll need to spend £350ish on a 272 cam at least. As the stroke of your eta setup will want the valves to be open for a tad longer. If you don't buy a cam, you may as well turbo a 325i lump. (My opinion though that is!)
Vernier cam pulley to take up the slack by your machining of the block, and you'd be good to go.
In essence, your getting a larger stroke with the same compression ratio so off boost you'd have 2.7 torque and having increased stroke a little earlier. (250rpm???) spool up time is sooner.
Also if you go exactly as I am, m20b20 block. You may want to message simon13. He has been exposed to a b10 biturbo and may possibly know what the ring gap tolerances are. Copying a m30b34t ring gap is as close as you'd get to having it correct as no one really has a definitive answer of what it ought to be for turbo'd m20b25/27 this is important to minimise crankcase pressure and oil contamination.