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Old 08 Oct 2007, 10:15 am
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Default Would it be better to turbo a B16A or a B18B, if Im already replacing internals and valvetrain.?

Would it be better to turbo a B16A or a B18B, if Im already replacing internals and valvetrain.?
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Old 08 Oct 2007, 10:18 am
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I would say the B18B. Larger displacement, no-vtec. Non vtec is better for turbo in my opinion. Drop some low compression pistons in there and boost it big.
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Old 08 Oct 2007, 10:22 am
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B18B. The block is a little stronger. lower compression is a must however. Less headaches with forced induction with this block.
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Old 08 Oct 2007, 10:24 am
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Both motors are good, if you note that D-sport magazine made over 580whp on a B16, bore to 1.7liter ran the 1/4 low 10s and was a streetable car, not gutted. Reason why they made that much power is because the car is able to rev high in the RPM range where most larger bore motors like B18's, B20's,H22 cant. The whole idea is the larger the bore or stroke is the more strain you put on the internals even though you replace with such items like forged piston and rods. A smaller bore motor is able to rev higher and safer and is able to produce more horsepower not saying that the larger bore isn’t better. For example on a 1.6 liter motor B16 it took longer for my turbo to spool up Garrett GT35R while a B20 motor took less time to spoolin in the same turbo. Reason being that the larger displacement allow for more exhaust fuels to go into the turbo allowing it to spool to full boost on lower RPM. B20 Vtec motor would be a great motor best of both worlds, note the stock B20 motor isn’t strong and has weak cylinder walls and tend to crack on boost. B20vtec.com will give you more on the B20 motors. You can view Honda-tech.com to see what people are running and how much whp they are making.Also acceleration is key I recommend a GSR tranny for your turbo project, depending on what motor you go if you get a B16 tranny your motor would have to rev higher to take full advantage of it since B16 transmission have a shortest gear in the B-family. And if someone says get and LS because you are able to say into boost longer please check out the link below:http://forums.evans-tuning.com/viewtopic.php?t=1496
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Old 08 Oct 2007, 10:27 am
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If driveability and reliability are what you want as well, go with the B18B. It has more torque even with lower compression cylinders because of its larger displacement. For all out performance, go with the B16A. Then again, why not spend a little more and get a B18C1? You'll have everything you need. Someone mentioned a boring out the B16A to 1.7 litres. Isn't the B18C1 just a little over 1.7 liters. Displacement wise it is a little smaller than a B18B, but you get the VTEC if that's what you desire. Personally, I'd be happy with just a B18B built and boosted. Great combination for everyday and track use.
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