I could go stock but my bore on #6 doesn't look so great, I'm into around £1000 for linering and standard pistons or I can have oversize pistons made at about the same cost, this isn't very appealing!
Help please with alternatives? I have a 324d crank (same as the ETA but forged), and a whole selection of B20, B23 and B25 parts, so I could go for a larger capacity. I want to keep the car at least looking stock so the original numbers matching block plus the K-Jet. What combination of crank/pistons/rods can I use, what capacity could I end up with.
Sorry this is such a woolly question but I don't really know what the options are or where to start?
So I'll probably have to go stock which means a new set of pistons. Ireland Engineering list these for the e30 but not for the e21, and upon checking the ETK I find they have different part numbers.
Does anybody have experience of having pistons made by Ireland Engineering or indeed anyone else?
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Using your 81mm crank would need the block boring out to ø84mm and pistons & head to suit.
Then depending what CR you are happy with or what pistons you use, decking the block and a vernier cam gear may be needed.
To use your 200 casting head and the Diesel crank would need ETA pistons (or new custom ones).
There is a lot of info around about M20 build just have a search.
1983 316 (Taiga Thunder - The refined S54 Race car)
2004 330d Touring (The Daily Hack / Tow Car / Load lugger)