Hello!
After blowing definetely my 2.5 (m50 nv) I made a step back and picked up an m42b18 after discovering it's potential with forced induction and stroker options. All this because putting an M54B30 is too easy :D
1.8is - Very interesting motor. Initially I don't even thinked about it with a 2.5 running, but later I started to like it. My "new" engine is still on the floor but I know I'll miss the power from the beginning so started to collect info about what I can to do.
Basic start, 2871 low boost on all stock internals, Micriosquirt ecu (already have it), about 180 200hp, but I'll want more, I know :) .
But what about more serious turbo? Let's say 1 - 1,5 bar, about 300hp.
The pistons seems to be always the weak point. What to do?
I know I can use M54B30 pistons for lower compression (M42 crank and rods, CR 8,5 or 9,2, right?), but aren't they still weak too, particulary if compared to M50B25 pistons?
What happens to the compression if I use M47 crank but M50 135mm rods and pistons? I immagine this setup should be stronger for boost, but I have not enough numbers for some calculation.
I would like to avoid block shaving, piston decking and other machine shop operations to keep the cost low but good power output. Not trying to beat absolute power records, so "smart" compromises are researched (or simply looking for cheap miracles, maybe it's possible :) .
Any good idea? :yawn:
After blowing definetely my 2.5 (m50 nv) I made a step back and picked up an m42b18 after discovering it's potential with forced induction and stroker options. All this because putting an M54B30 is too easy :D
1.8is - Very interesting motor. Initially I don't even thinked about it with a 2.5 running, but later I started to like it. My "new" engine is still on the floor but I know I'll miss the power from the beginning so started to collect info about what I can to do.
Basic start, 2871 low boost on all stock internals, Micriosquirt ecu (already have it), about 180 200hp, but I'll want more, I know :) .
But what about more serious turbo? Let's say 1 - 1,5 bar, about 300hp.
The pistons seems to be always the weak point. What to do?
I know I can use M54B30 pistons for lower compression (M42 crank and rods, CR 8,5 or 9,2, right?), but aren't they still weak too, particulary if compared to M50B25 pistons?
What happens to the compression if I use M47 crank but M50 135mm rods and pistons? I immagine this setup should be stronger for boost, but I have not enough numbers for some calculation.
I would like to avoid block shaving, piston decking and other machine shop operations to keep the cost low but good power output. Not trying to beat absolute power records, so "smart" compromises are researched (or simply looking for cheap miracles, maybe it's possible :) .
Any good idea? :yawn:
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