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I've always been a fan of the b18c1, I seem to be able to push more hp out of them than I can an h22 motor. Ok Honda's are all about the short stroke, most engines are built for torque, rather than horsepower. Larger bore equals more horsepower, while a longer stroke equals more torque. A long stroke allows the engine to produce power for a longer period of time, and subsequently more torque. There is a drawback to a long stroke though. b/c the piston must travel a longer distance, there is a limit to how many RPM the engine can handle. On the opposite end of the spectrum, an engine with a large bore and short stroke will produce less overall torque, but has the ability to reach much higher revolutions per minute, and subsequently more horsepower. Honda have been building engines with less torque, but the ability to rev much higher. This typically means that honda's don't accelerate as quickly right off the line as their counterparts, but they are able to accelerate for longer in the same gear. The point of my ramble is that honda's are meant to run at high RPM (b18's are reinforced with cylinder walls of ductile) this upgrade will not hurt the engine, seeing as it is designed to work with the engine at hand. Still I recommend Internal work with any vehicle. I'm mixed on throttle body spacers, but I doubt ppl get as big an increase as they say they do. There supposed to enhance mid-range power, torque, and fuel efficiency, who knows? For the intake, unless your really crafty with a welding torch (or I've seen them in PVC?) I'd recommend buying one, intake isint going to benefit you with the biggest gains. (Focus on internal work)
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