01-27-2013, 02:34 PM
Location: Next door bring tools and beer.
Join Date: Jan 2011
Mein Auto: 89 m30b35/5 project
Again I apologize for my response.
Originally Posted by Microtesties
Unfortunately, I can't afford to just buy a new engine, but I can try to refresh and upgrade the existing one. Hence why we are here today; me asking a question on the engine I currently have, an M20. I was unaware the logical first approach to any engine maintenance was replacement of the engine.
Truth is (this is stateside only), the m20b25 is sort of the red headed stepchild of the e34 model. Only second to the m60b30.
Across the pond they have other variants which never arrived on our shores.
Our friends over there may have more to speak of when it comes to not well desired models.
However back to topic.
The m20b25 like it's bigger brother m30b35 can be upgraded in certain areas where they would be more lively.
The basics usually are air filter, coil replacement, plug wires, exhaust changes, etc.
From there a routine valve adjustment and injector replacement (for efficency not performance) are options.
E30/ M20 specific. You can swap heads and blocks.
885 Head (1987-up m20 Head iirc) on a Eta block (1983-1986 m20 block iirc) = a mildly stroked m20
Simply put if your looking for more power and reliability.
You have a decent choice of engine. But its in the wrong chassis to gain any benefit.
IMO do the basics. don't get wild with it. Save your cash and either buy a used m30b35 with 5spd manual trans
to swap in (which aren't expensive or extremely hard to install )or save up for a 525 with a m50 in it.
Last edited by MySatinDoll; 01-27-2013 at 02:38 PM.