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R18 to R20

22297 Views 28 Replies 13 Participants Last post by  Megaman X
I know there are older threads on this, I've just been trying to get some more information on modifying my R18. According to some, you can run certain parts from an R20 (cam, crank, oversized pistons, amongst a few other things). I'm wondering if anyone knows someone who has successfully done this, or has any info on what I can do to find out what will work and what wont.

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I may be a little late on this, but I think that it's better to turbo charge the r18 vs the r20. Turbo chargers increase oil compression and so does vtec. Turbo charging an si makes it harder to use the full potential of vtec and the turbo charger and you have crazy oil compression, which will cause the engine to blow. While the r18 doesn't have vtec, you can have higher psi and take full advantage of turbo. But as you said earlier, replacing certain parts of the engine with r20 parts, I believe its doable, if you know what you're doing.
Dude I honestly dont have a clue of what you are trying to say man. Doing any kind of upgrades to an economy engine like the r18 will not yield as many gains compared to a k20. However you are very wrong when you said that its better to turbo an r18 than a r20, an r20 is essentially the same as a r18 only with a bigger displacement due to the stroke, they are the same engine in every other aspect. The r20 having a larger displacement will yield a larger gain compared to an r18 assuming we have the same turbo setup. Turbo does not increase oil compression, but I think you meant oil pressure. could you elaborate on what you meant by this? Vtec engine can be turboed there are some pros and cons of turboing a vtec engine, it all depends on what your goals are. Theres a couple of threads on honda tech and other websites regarding this subject. The r18 and r20 have vtec, however is not the high lift vtec that a k20 has, its a econo-vtec, temple of vtec asia has a good article explaning this. Both engines can take advantage of a turbo again it all depends on what your goals are.
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