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The B20E had a number of things that helped bump the power up over the prioer 118 hp B20 (B20B?).
- bigger intake valves - 44mm vs 42mm
- higher compression ratio - needed high octane gas back then, luckily enough they published a different octane number back then than they do now, the 93 octane you can get now is pretty roughly equivalent to the 100 octane it was built for. You will most likely need that premium though.
- 'D' grind cam - supposedly a version of the R-sport rally cam they made in the 60's for the B18. A more sporting cam with more power at higher RPM's. It's actually a nice perker-upper for any B18/20 with the more sedate 'C' grind cam. Unless you have an RPM hating auto trans, in which case the 'C' probably works better.
- D-Jet injection. They liked to advertise that the bump in HP is from D-jet, but that's not really the case so much, they just needed to justify the price increase of fuel injection somehow because they needed it on the cars to pass emissions tests. I think most of the changes above produced most of the 'extra' HP, but one thing D-Jet did bring that helped was the intake manifold. Long, uninterrupted intake runners, opening into a properly sized plenum. I think this was tuned to help bump up low/mid range torque.
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'63 PV544 rat rod, '93 Classic #1141 245 +t
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